The Drift — August 20 – 26, 2026

The Drift, in brief: the flats don't open this week. Not for a morning — not once, in seven days. The lowest water on the whole calendar is plus 0.8 feet, at 4:43 Wednesday morning, in the dark, and every daylight low is over a foot. So stop planning walks and start planning swims. Today is clean and it ends tonight. Then three wet days, and Monday reopens it and holds through Wednesday.

If you only do one thing this week: paddle Pleasant Bay Monday midday out of Meetinghouse Pond or Quanset 👶 — high water right around noon on the smallest tidal range of the week, southwest at 5 to 9, and the hottest air of the seven days.

Flat calm out there this morning and not a cloud anywhere on the Cape. Southwest at 3. Enjoy it while you've got it, because the rain shows up tonight and it's the last clean sky until Monday.

Here's the shape, and it's the exact mirror of what I handed you last Thursday. Last week gave you everything on day two and quit. This week gives you almost nothing for four days and then pays you back three in a row. The range at Sesuit runs 8.0, 8.1, 7.8, 7.9, 8.2, 8.7, 9.2 feet — far smaller than anything in either of the last two issues, and climbing only at the end. The daily low never once goes negative: 1.5, 1.2, 1.4, 1.4, 1.3, 1.1, 0.8. Last Friday the bay handed you minus 1.2 feet. The best it will do this week is plus 0.8, before sunrise.

These are the real NOAA predictions, not whatever your phone rounds them to. The Sound and Pleasant Bay own this week, so the page worth printing is Stage Harbor — and its quiet cousin Pleasant Bay, which is the number most people out toward Orleans and East Harwich actually need. Stick them on the fridge. You can leave the Sesuit page in the drawer this week.

The lazy half of the month, and what it's actually good for

Two weeks running, this column has been about the biggest tides of the summer. This week is the other end of the same swing. We're just past first quarter, the moon is at 52 percent this morning, and the astronomical pull on the water is about as weak as it gets. The front half of the week is the lazy part of the lunar cycle. The back half is already winding up toward Friday's full moon — you can watch it happen in the numbers, from an 8.0-foot range today to 9.2 by Wednesday, with a lot more to come after that.

Most people read a small-tide week as a dud. It isn't. It's a different week, and here's the honest arithmetic.

Nothing runs hard. The Sound swings three and a half feet instead of four and a half. Pleasant Bay swings 2.3 feet on Monday, the smallest number I've printed all summer. That's a gift to anybody in a kayak, on a paddleboard, or teaching a nine-year-old to row.

The beach never fully leaves. No minus tides means no waiting for a window. Walk at any hour and there's sand under you.

And the water in the shallows gets a quieter week. Smaller ranges mean less exchange with the deeper, colder water offshore. That's one factor among many — wind, sun, mixing and what's moving in from offshore all matter more on any given afternoon — but it's a real one, and on the Sound side it tends to favor a warm swim.

What you give up is the walk-out: the wide, strange, half-mile-of-bottom event that made last Friday worth an alarm clock. You don't get one this week, and you won't get another one in daylight until September. I told you that last Thursday and the numbers have held.

I'm not spending the "clear your calendar" call this week. Nothing in these seven days earns it. That's not a bad week — it's an honest one, and the whole point of saving that call is that when I do spend it, you can believe me.

The correction I owe you, and the one I got right

Last week I printed the Sound at 78° and the bay at 74° and wrote: this is the top of the year; from here it only goes the other way.

As of the readings that came in this morning, NDBC buoy 44020 in Nantucket Sound reads 76°F — that's the 7:20 observation — and buoy 44090 in Cape Cod Bay reads 70°F, taken at 6:30. The Sound gave back two degrees. The bay gave back four.

I'll be careful about how I say the rest of it, because I overstated this last week. I can tell you those two readings were the highest I've printed this season and both stations have cooled since. I can't tell you it was the absolute high-water mark of the year without going back through the whole season's record, and I haven't. What I can say is that the bay warms faster than the Sound and cools faster too — it's shallower and there's less of it, so a run of cool nights and a shift in the wind moves it in a way the Sound shrugs off.

One more caveat that matters if you're the one getting in: those are buoy readings, not beach readings. Nearshore water can run a few degrees either side of the number, warmer in a sun-baked shallow cove on the flood, colder where a channel is dumping. Seventy at the buoy does not mean seventy at the end of the Linnell Landing ramp. Use it as a direction, not a promise.

And on the sky: I promised sunshine eight days out two weeks running and got burned for it, so I said I'd stop. Monday, Tuesday and Wednesday all read clean right now, and Tuesday and Wednesday are the cleanest of the three. Monday's the one I'd build a plan on because it's closest, but even Monday reads slight chance of showers, then mostly sunny — the front is clearing through, and the morning may be the ragged part. Ask me again Sunday and I'll tell you straight.

Day by day

Thursday the 20th is the good one and you're standing in it. Sunny in all eight towns, rain chances at 3 to 5 percent, wind light and variable under 8 — this is as quiet as August air gets. 80 in Brewster and Harwich, 76 in Chatham, Orleans and Eastham, 75 in Wellfleet, Truro and Provincetown — the standing Outer Cape discount, four or five degrees and a little more haze, same as every week. The water gives you nothing to plan around: the Sesuit low is 1.5 feet at 11:40 this morning and the ebb west of Morris Island tops out at 0.80 knots at 11:11, the softest daylight current of the week. So don't chase the sand and don't bother with the rod. Today is a swim day and a sit-still day. Hardings, Cockle Cove or Ridgevale 🌊 in Chatham; Red River or Bank Street 🌊 in Harwich. Go after work — sunset's at 7:32 and the rain moves in tonight at better than a 60 percent clip in every town. You will not see another sky like this until Monday.

Friday the 21st is the day the door swings shut, and it swings from the east. Northeast at 3 to 9 — the first proper onshore air in a week — with showers running a chance in the neighborhood of 40 percent Cape-wide, and the temperature backing off to 75 in Harwich, 74 in Brewster, 72 from Chatham through Truro, 71 at Provincetown. Cooler, grayer, and on the ocean side it will feel like a different month. NWS Boston is carrying a Low rip-current risk and about two feet of surf — a quiet day in the water, just a gray one over it. The move is to get out of the wind's way. This is Pleasant Bay's morning: high water at 9:08, a two-and-a-half-foot range, and an east wind the Bay barely notices because there's a barrier beach in front of it. Put in at Meetinghouse Pond or Quanset 👶 and you'll have most of it to yourself. Gray is not the same as bad.

Saturday the 22nd. Let it go — and it got worse overnight. Yesterday's run had Saturday around a 60 percent shower day. This morning's forecast has showers and thunderstorms at 86 to 89 percent in every one of the eight towns, and better than 80 percent again after dark. East wind at 7 to 13. 76 in Brewster and Harwich, 74 in Chatham and Orleans, 73 in Eastham, Wellfleet and Truro, 72 in Provincetown. The tide is the week's smallest, a 7.8-foot range at Sesuit, and the ebb at Morris Island can't clear 0.76 knots. There is nothing here. Saturday is the chores day, the errand day, the read-a-book day. If you were counting on the weekend, count on Monday instead.

Sunday the 23rd is warm and unsettled and the sky owes you nothing. 79 in Brewster, 78 in Harwich, 77 in Orleans, 76 in Chatham, Eastham and Truro, 75 in Wellfleet and Provincetown on a south wind at 3 to 12, with showers around a 50 to 55 percent chance and thunder possible into the evening. That's a soft, close, tropical-feeling Sunday under a sky you can't trust. Take the morning if you're taking anything. And note the one number that goes up: NWS has the surf building to three to four feet on the outer beaches Sunday — the biggest in the outlook — on a south wind after two days of easterly. Read the rip section below before you drive to Nauset.

Monday the 24th is the prize. The front clears through and this is the first real sky in four days: mostly sunny after a slight chance of showers early, southwest at 5 to 12, rain chances down around 15 percent. 86 in Orleans, 85 in Eastham and Truro, 82 in Wellfleet, 81 in Brewster, Harwich and Provincetown, 79 in Chatham. Hottest day of the week, brightest day of the week, and — this is the part worth writing down — high water in Pleasant Bay lands right around 12:00 noon on the smallest range of the whole week, 2.3 feet. That is about as gentle a tidal setup as this Cape offers. Put in at Meetinghouse Pond or Quanset 👶 any time between eleven and two and you've got a forgiving window toward the Narrows, Pochet or the outer bars. Forgiving is not the same as foolproof — the channels, the bars, the boat traffic and an afternoon sea breeze are all still there, so take the chart, take the phone, and tell somebody where you're going. But if you've been meaning to bring somebody out on the water who's nervous about being on the water, this is the day of the summer to do it.

Tuesday the 25th is the quiet, perfect one — and the day the water starts waking back up. Sunny, wind west to southwest at 6 to 12, rain chances at 1 percent. 82 in Orleans and Eastham, 81 in Truro, 80 in Wellfleet, 79 in Provincetown, 78 in Brewster and Harwich, 77 in Chatham. A westerly is offshore on the east-facing beaches, which usually flattens the surf and settles things down, so this is the Atlantic day: Nauset 🅿️, Coast Guard and Nauset Light, Marconi, Head of the Meadow. Cold water and empty sand by four o'clock. Down at the elbow, Aunt Lydia's Cove touches 0.0 feet at 5:20 in the morning on a 5.2-foot range — the first time all week the Atlantic bothers to go all the way down. And the afternoon ebb at Morris Island runs 0.93 knots at 3:56, the first current worth a rod since last Sunday.

Wednesday the 26th closes the week by handing next week's back. Sunny again, southwest at 6 to 12, rain chances around 5 percent. 83 in Orleans and Eastham, 82 in Truro, 80 in Wellfleet, 79 in Brewster, Harwich and Provincetown, 77 in Chatham. Everything in the water is bigger: Sesuit's range jumps to 9.2 feet, Aunt Lydia's to 5.4 with a low of −0.1 at 6:03 in the morning — the only minus number in the issue — and the ebb west of Morris Island finally clears a knot again at 1.00 at 4:35 in the afternoon. The moon is at 97 percent. The spring tides are loading, they land next week, and Wednesday is you watching the wind-up.

And then there's the reason to leave the house Wednesday evening, which has nothing to do with tides. The moon comes up out of the Atlantic around 6:46 PM. Sunset in Chatham is 7:22. That's roughly 36 minutes — a minute or two either way depending which beach you're standing on — with a near-full moon rising over the water in front of you and the last of the light behind you. Nauset. Coast Guard. Marconi. Head of the Meadow. Get there by half past six. Clouds are the one risk: the forecast puts a few in after dark Wednesday, so it isn't a lock, but it's the best shot of the summer at that particular picture.

This week's windows

• Flats walk: there isn't one. For the record, the best available is Wednesday at 4:52 PM, plus 1.3 feet at Sesuit, with sun until 7:22 — a perfectly pleasant, entirely ordinary walk on wet sand. That's the best of a thin lot and I'd rather you swam.

• Paddle: Monday, 11 AM to 2 PM, Pleasant Bay out of Meetinghouse Pond or Quanset 👶. High water around noon, a 2.3-foot range — the smallest of the summer — southwest at 5 to 9, air in the low-to-mid 80s. One of the gentler setups you'll get all year, which is not the same as a free pass: mind the channels, the bars and the afternoon breeze. Empty-water alternate: Friday morning, high water 9:08, gray and cool and yours alone.

• Swim: today, then Monday through Wednesday. Nantucket Sound is reading 76° at the buoy — Hardings, Cockle Cove, Ridgevale, Red River, Bank Street 🌊. Cape Cod Bay is reading 70°, down four in a week, so Linnell and First Encounter 🅿️👶🌊 are a swim for the committed rather than the easy yes they were last Thursday. Both are station readings; your beach will vary.

• Fish: nothing until Tuesday. Thursday through Sunday the Morris Island ebb never clears 0.80 knots and it isn't worth the gas. Then it builds: Tuesday 3:56 PM at 0.93, Wednesday 4:35 PM at 1.00 — the first daylight ebb to clear a knot since last Monday, and a straight ramp into next week's springs. The flood tops out at 0.65 all week and never does much here.

• Moonrise: Wednesday, around 6:46 PM, any east-facing beach. Ninety-seven percent, sunset 7:22, roughly 36 minutes with both above the horizon.

• Dark sky: a poor week for it. The moon runs 52, 62, 71, 79, 86, 92, 97 percent across the seven nights and dominates the sky from the weekend on. If you went looking for the glow last week, that was the window. Next real one's in September.

The water, zone by zone

We start near the weak end of the lunar cycle and spend the back half rebuilding toward Friday's full moon. Same story, four ways.

The bay flats don't open. Sesuit runs 8.0 → 8.1 → 7.8 → 7.9 → 8.2 → 8.7 → 9.2 feet across the week, with lows of 1.5, 1.2, 1.4, 1.4, 1.3, 1.1 and 0.8 — and that last one, the only number under a foot, arrives at 4:43 Wednesday morning, more than an hour before sunrise. Wellfleet and Provincetown run the same shape within half an hour and are no better. Paines Creek, Linnell, Skaket, First Encounter, Mayo Beach: all lovely, all sitting under water. Come back in September.

The Sound does its small quick swing and doesn't do it hard. Stage Harbor holds a range of 3.3 to 3.7 feet and Wychmere Harbor 2.9 to 3.6. The current west of Morris Island starts the week at its weakest in a month and climbs every day: 0.80, 0.76, 0.76, 0.80, 0.86, 0.93, 1.00 knots on the strongest daylight ebb of each day. Last week's best was 1.15. That's about a fifth less water moving, and you can feel a fifth. The ebb is the strong water in this corner of the Cape every week of the year, including the weak ones — the flood never touches 0.66 and never does.

Pleasant Bay owns this week, which almost never happens, and it owns it precisely because everything else is either wet or lazy. The range shrinks from 2.7 to a summer-low 2.3 feet on Monday, then rebuilds to 3.0 by Wednesday. High water walks a clean hour later every day — 8:11, 9:08, 10:08, 11:06, 12:00, 12:46, 1:27 — which marches the good midday paddle window straight into Monday lunchtime and then past it. The old mnemonic still serves: Pleasant Bay runs roughly three hours behind the Sound. It's a rule of thumb for planning, not a navigational fact — check the station if it matters.

The Atlantic is quiet at the front end and interesting at the back. Aunt Lydia's Cove holds a range of 4.6 to 4.9 feet Thursday through Monday with lows that don't get below plus a tenth, then 5.2 on Tuesday with 0.0 at 5:20 AM and 5.4 on Wednesday with −0.1 at 6:03 AM. The bars at the elbow that came dry every morning last week stay under all weekend and start showing again Tuesday. Surf-wise the outer beaches run two to three feet today, around two Friday, around three Saturday, and three to four Sunday — the week's biggest, and worth a look at the rip section before you commit.

Sky & tide

Sunrise walks from 5:53 Thursday to 5:59 Wednesday. Sunset falls from 7:32 to 7:22. That's ten minutes of evening gone in seven days, a minute more than last week, and it'll be eleven next week. (Times are for Chatham; the rest of the Lower and Outer Cape runs within a minute or two.) This is the stretch of August where you notice it in the beach parking lot — you get out of the water, you look up, and the light is already going.

The moon runs from just past first quarter to nearly full: 52, 62, 71, 79, 86, 92, 97 percent, with the full moon landing Friday morning the 28th. Moonrise pushes later each evening — 2:36 PM Thursday, 4:27 Saturday, 5:49 Monday, and around 6:46 PM Wednesday, which is the one that matters. (NWS Boston keeps the sun and moon tables for the whole month.)

Water, as of this morning's observations: Nantucket Sound 76° at buoy 44020, Cape Cod Bay 70° at 44090 — down two and down four from last Thursday. On the backside, NWS Boston is calling the ocean beaches upper 60s today, which is warmer than the Atlantic usually gets credit for and is a genuinely swimmable number for anybody who grew up here. Still: a Sound beach and a backside beach can be eight or nine degrees apart on the same afternoon, twenty minutes apart by car. That's the local flex and nobody else in New England has it.

Out on the water

The shorebirds, and the quiet upside of a small-tide week. Late summer is one of the Cape's big southbound migration windows — different species peak at different points from early August into September — and a lot of what's standing on our flats right now nested in the Arctic six weeks ago. Cape Cod is a refueling stop, not a finish line: some of these birds will make several more before they're done, and for a few species the trip does end in South America.

Here's the part I'd call an observation rather than a law: with the water never dropping far this week, there's simply less exposed flat, and the birds you'd normally have to walk out half a mile to see should be easier to find packed along the remaining bars and the waterline. Skaket, First Encounter, Mayo Beach, the Wellfleet flats, the edges of Pleasant Bay — go around the top of the tide and look. Then keep well back and keep the dog off. Every flush costs them energy they need over open ocean.

Sharks and seals. August is peak white-shark season here and peak beach season at the same time, which is exactly why this paragraph runs every week. White sharks hunt seals in Cape waters, so give seals and their haul-outs a wide berth and don't swim near them. Check Sharktivity before you commit to anything on the Atlantic side, and the Seashore's shark-safety page is still the plainest four minutes of reading you'll do all summer.

Rip currents — what the source actually says. NWS Boston has the rip-current risk at Low today and Friday, with surf two to three feet today and around two tomorrow. Low does not mean none — the official language is explicit that dangerous rips can still form near groins, jetties, reefs and bars even on a Low day, and Nauset and Coast Guard have plenty of bars.

Beyond Friday NWS hasn't assigned a category yet, and neither will I. What I can tell you is the setup: an easterly at 7 to 13 all day Saturday and about three feet of surf, then a south wind Sunday with the surf building to three to four feet — the biggest in the outlook. That combination is the kind of thing that puts more energy into the east-facing beaches — Nauset, Coast Guard, Nauset Light, Marconi, Newcomb Hollow, Head of the Meadow, Ballston — and it's a reason to check the surf-zone forecast and the beach flags Saturday and Sunday morning rather than assuming. If you swim the ocean side this weekend, swim at a guarded beach, between the flags, and read the flags before you get in.

Monday and Tuesday's westerly flow is offshore on those beaches and usually settles them down. Usually is doing some work in that sentence.

The week, do's and don'ts

(This is the part to forward to the group chat.)

Do:

• Go swimming today. Sunny in all eight towns, 80 in Brewster and Harwich, almost no wind, and the Sound reading 76° — Hardings, Cockle Cove, Ridgevale, Red River, Bank Street 🌊. The rain starts tonight. You will be annoyed on Saturday if you skipped it.

• Paddle Pleasant Bay Monday between eleven and two. High water around noon, a 2.3-foot range — the smallest of the summer — southwest at 5 to 9, 86 degrees in Orleans. Meetinghouse Pond or Quanset 👶. One of the gentlest windows of the year for a recreational paddle. Still take the chart and tell somebody where you're headed.

• Take Friday morning if you want the Bay to yourself. High water 9:08, cool, gray, northeast at 3 to 9, and nobody else out there.

• Go to the ocean Tuesday, not this weekend. Westerly at 6 to 12, sunny, and Nauset 🅿️, Coast Guard, Marconi and Head of the Meadow empty out by four.

• Be on an east-facing beach by 6:30 Wednesday evening. Moonrise around 6:46 at 97 percent, sunset 7:22 — roughly 36 minutes with both up. Bring a chair. Bring a flashlight for the walk back over the dune, and keep it off while you're watching.

• Fish Tuesday and Wednesday afternoon. The Morris Island ebb runs 0.93 knots at 3:56 Tuesday and 1.00 at 4:35 Wednesday — the first daylight ebb to clear a knot since last Monday, and it keeps building into next week.

• Go look at the shorebirds around high water. Less exposed flat this week should mean more birds along the bars you can actually see from the beach. Skaket, First Encounter, Mayo Beach, the Pleasant Bay edges. Stand well back and let them eat.

Don't:

• Don't plan a flats walk. Any day. At all. The lowest water of the week is plus 0.8 feet at 4:43 Wednesday morning, in the dark, and every daylight low is over a foot. There's no window, and pretending otherwise just sends somebody to Brewster for nothing.

• Don't build a weekend on Saturday. Showers and thunderstorms at 86 to 89 percent in all eight towns, better than 80 percent again after dark, east wind at 7 to 13. It's a chores day. Let it be one.

• Don't drive to the outer beaches Saturday or Sunday without checking first. Surf around three feet Saturday and building to three to four Sunday, on two days of onshore and cross-shore wind. Check the surf-zone forecast and the flags that morning. Guarded beach, between the flags, or stay out.

• Don't count on Sunday. It's the warmest weekend day at 75 to 79, and it carries a 50 to 55 percent shower chance with thunder possible into the evening. Take the morning or take nothing.

• Don't assume the bay is still warm. The buoy reads 70°, down four degrees in seven days — and that's a buoy, not the end of the ramp at Linnell. Perfectly swimmable, no longer the effortless yes it was last week.

• Don't bring the dog to the Brewster beaches or flats. The town prohibition runs May 15 through September 15 — beaches, ponds, landings and flats, permit or no permit. Three and a half weeks left.

• Don't take Monday through Wednesday's sunshine as gospel yet. It's four, five and six days out, and Saturday just moved thirty points in a single forecast cycle. Monday's the safe one. I'll firm up the back half Sunday.

Tags: 🐕 dog-OK · 👶 easy/flat · ♿ accessible · 🅿️ free parking · 🌊 swim-safe · ⚠️ rip/hazard.

Shot of the week + your turn

Last week I asked for two things and you delivered on one. A dozen of you wrote back about the glow — most of the yeses came from bayside landings and the still corners of Pleasant Bay after nine o'clock, and most of the noes came from people standing on open ocean beaches with a phone in their hand. That tracks. The map's getting better every week and I'll publish it in September, so keep them coming.

This week I want one photograph and I'll tell you exactly which one. Wednesday, around 6:46 PM, east-facing beach, the moon coming up out of the ocean with the sun still in the sky behind you. Send it with the beach and the town and I'll run the best of them next Thursday. It's the easiest good picture of the whole summer and roughly four people will bother to take it.

And the standing ask: what's the water doing in your town? Reply to this email. A sentence is plenty.

Bottom line

Today is the day. Go swim — the rain arrives tonight. Then give Friday to Pleasant Bay, give Saturday to your errands, and don't let Sunday talk you into a beach day it can't back up.

Monday's the one to plan around — clear, 86 in Orleans, and high water in Pleasant Bay at noon on the smallest range of the summer. Tuesday's the clean, empty ocean day. Wednesday the water finally starts climbing again, the ebb clears a knot, and the moon comes up out of the Atlantic around 6:46 with the sun still out.

No flats this week. Not one. Stop looking for the walk and go get in the water instead — and get ready, because next week the springs come back.

Forward this to whoever was already planning a flats walk this weekend, so they don't waste the drive — and to whoever you want standing next to you on an east-facing beach at quarter to seven Wednesday.

If somebody forwarded it to you: the Drift runs every Thursday, free, and refer three neighbors and I'll send you the tide cheat-card that lives on my own fridge.

Tides and currents from NOAA Tides & Currents station predictions (Sesuit Harbor 8447241, Wellfleet 8446613, Provincetown 8446121, Stage Harbor 8447505, Wychmere Harbor 8447506, Pleasant Bay 8447291, Aunt Lydia's Cove 8447435, current station ACT1636). Water temperatures from NDBC buoys 44020 and 44090, observed the morning of August 20. Forecasts, surf heights and rip-current risk from NWS Boston/Norton, issued 4:08 AM and updated 6:31 AM EDT, August 20. Forecasts change — check the source before you commit to a day.