Boston, MA tide chart

High and low waters at NOAA tide prediction station 8443970, Boston, in feet above mean lower low water and in local clock time. Tables below are grouped by calendar month, so each one stays correct for the whole month it names.

Predictions stored for Saturday, October 17 to Friday, October 23 (7 days, 27 high and low waters), retrieved from NOAA on 2026-10-17.

The week of Saturday, October 17

First high water shown4:31 a.m.8.145 ft, Saturday, October 17

First low water shown10:24 a.m.2.364 ft, Saturday, October 17

Highest in the stored range9.72 ftFriday, October 23, 9:56 p.m.

Lowest in the stored range0.759 ftFriday, October 23, 3:45 p.m.

Saturday, October 17 to Friday, October 23 at Boston. Cyan means the water is rising, violet means it is falling. The dots are NOAA's predicted extremes; the line between two dots is a half-cosine interpolation, not a NOAA value. Your browser will move this to the current week if it can.

Water rising (flood)Water falling (ebb)Now, when your browser can draw it

Tide times at Boston, October 17–23, 2026

Stored predictions cover October 17 to 23 only, so this table is a part month. The full month is available from NOAA through the printable tool.

Predicted high and low waters at NOAA station 8443970 (Boston), October 17–23, 2026, feet above MLLW, local clock time with daylight saving applied where in effect.
Date	Tide	Time (local)	Height, ft above MLLW
Saturday, October 17	High	4:31 a.m.	8.145
	Low	10:24 a.m.	2.364
	High	4:37 p.m.	9.099
	Low	11:07 p.m.	1.588
Sunday, October 18	High	5:26 a.m.	7.978
	Low	11:19 a.m.	2.526
	High	5:33 p.m.	8.91
Monday, October 19	Low	12:02 a.m.	1.712
	High	6:21 a.m.	7.99
	Low	12:15 p.m.	2.512
	High	6:29 p.m.	8.858
Tuesday, October 20	Low	12:55 a.m.	1.68
	High	7:15 a.m.	8.187
	Low	1:11 p.m.	2.31
	High	7:25 p.m.	8.941
Wednesday, October 21	Low	1:46 a.m.	1.515
	High	8:06 a.m.	8.551
	Low	2:05 p.m.	1.928
	High	8:19 p.m.	9.14
Thursday, October 22	Low	2:35 a.m.	1.249
	High	8:53 a.m.	9.049
	Low	2:57 p.m.	1.391
	High	9:09 p.m.	9.418
Friday, October 23	Low	3:21 a.m.	0.922
	High	9:36 a.m.	9.63
	Low	3:45 p.m.	0.759
	High	9:56 p.m.	9.72

Printed from TideCurve. Predictions: NOAA CO-OPS station 8443970, datum MLLW, stored range 2026-10-17 to 2026-10-23, retrieved 2026-10-17. Astronomical predictions only.

Pick any dates for Boston in the printable tool, which requests them from NOAA when you open it.

What the numbers at this station mean

Heights are feet above mean lower low water, the datum NOAA uses for tide predictions on US coasts. A predicted height of 0.759 ft does not mean 0.759 ft of water under a boat: it means the surface is predicted to be 0.759 ft above the chart datum, and the depth at any spot is whatever the chart says plus that number.

Mean range across the stored period. The average height difference between one extreme and the next is 7.09 ft here, with the largest single swing 8.96 ft and the smallest 5.45 ft.
Spacing. Successive high waters sit 12 h 25 min apart on average, which is why a tide that is convenient this morning is inconvenient within a few days.
Type. This station returned 14 high waters and 13 low waters across 7 days. Where those counts are not close to two a day, the station's tide is not a simple twice-daily cycle and the curve above will look it.

Station provenance

NOAA station	Boston (8443970), Massachusetts
Coordinates	42.35389, -71.05028
Prediction type	Not recorded in the metadata record this station came from. The station is in NOAA's water level station listing and returns predictions from the predictions product.
Datum	MLLW — mean lower low water
Units	Feet
Time zone	America/New_York. Requested with `time_zone=lst_ldt`, so NOAA returns local standard time corrected for daylight saving time while it is in effect. Times on this page are clock times at the station, and no second conversion is applied anywhere.
Stored coverage	2026-10-17 to 2026-10-23 — 7 days, 27 predicted high and low waters, served at `/data/tides/8443970.json`
Retrieved	Station metadata 2026-10-16; predictions 2026-10-17
Request	`https://api.tidesandcurrents.noaa.gov/api/prod/datagetter?product=predictions&datum=MLLW&station=8443970&time_zone=lst_ldt&units=english&interval=hilo&format=json&begin_date=20261017&end_date=20261023`
Source	NOAA CO-OPS Data API, public domain. Station metadata from the CO-OPS Metadata API.

What these predictions are not. They are astronomical: the tide the sun and moon would produce on their own. NOAA's own FAQ puts it plainly — "we can only predict the astronomical tides" and not "the effect that wind, rain, freshwater runoff" have on the water level (NOAA Tides & Currents FAQ). A storm, a strong onshore wind or a wet week can put the water well above the line, and a hard offshore wind can hold it below. Nothing on this page tells you whether a place is safe to walk, swim, anchor or cross, and times of slack water are a different quantity again — see high tide vs slack tide.

Nearby stations

Predictions change along a coast, inside a harbour and up an estuary. If your spot is closer to one of these, use that station instead.

Hampton Harbor, NH — station 8429489, about 39 mi away
Fall River, MA — station 8447386, about 45 mi away
Jaffrey Point, NH — station 8424601, about 51 mi away
New Bedford Harbor, MA — station 8447636, about 51 mi away
Fort Point, NH — station 8423898, about 52 mi away

Or see every station on the list and how these pages were built.