Massachusetts · United States

Boston, MA tide times

Name: Boston, MA tide data — high & low extrema, next 7 days
Creator: TideTurtle
License: https://www.noaa.gov/disclaimer

Tide is currently falling — next low in 5h 53m

3.10 m / 10.2ft

Next high · 11:22 GMT-4

Heights relative to MLLW · 2026-05-15Solunar 4/5

Tide times at Boston, MA on Friday, 15 May 2026: first high tide at 10:45pm. Sunrise 05:22am, sunset 07:58pm.

TIDE CURVE

Next 24 hours at Boston, MA

Predictions: NOAA CO-OPS station 8443970 — heights relative to MLLW.

Harmonic prediction from the official tide authority. Very high accuracy under normal conditions; storm surge may shift actual water level. Not for navigation.

TODAY'S HIGHLIGHTS

Sun, moon and conditions on Fri 15 May

Sunrise

05:22

Sunset

19:58

Moon

New moon

3% illuminated

Marine-conditions data not available for this station. Wind, swell and water temperature ride along with Open-Meteo Marine; gauge-only stations (e.g. UK EA Flood) publish water level only.

7-DAY OUTLOOK

Highs and lows next 7 days

Today

Sat

3.1m / 10.2ft11:22

-0.3m / -1.1ft05:13

Coef. 97

Sun

3.1m / 10.2ft12:14

-0.4m / -1.4ft06:04

Coef. 88

Mon

3.6m / 12.0ft00:24

-0.5m / -1.5ft06:56

Coef. 102

Tue

3.6m / 11.9ft01:18

-0.4m / -1.4ft07:49

Coef. 100

Wed

3.5m / 11.6ft02:13

-0.3m / -1.1ft08:43

Coef. 96

Thu

3.4m / 11.2ft03:11

-0.2m / -0.6ft09:40

Coef. 89

All extrema (7 days)

Day	Type	Time	Height	Coef.
Sat 16 May	Low	05:13	-0.3m / -1.1ft	97
	High	11:22	3.1m / 10.2ft
	Low	17:24	-0.0m / -0.1ft
	High	23:33	3.6m / 11.8ft
Sun 17 May	Low	06:04	-0.4m / -1.4ft	88
	High	12:14	3.1m / 10.2ft
	Low	18:15	-0.0m / -0.1ft
Mon 18 May	High	00:24	3.6m / 12.0ft	102
	Low	06:56	-0.5m / -1.5ft
	High	13:08	3.1m / 10.2ft
	Low	19:07	-0.0m / -0.0ft
Tue 19 May	High	01:18	3.6m / 11.9ft	100
	Low	07:49	-0.4m / -1.4ft
	High	14:04	3.1m / 10.1ft
	Low	20:00	0.0m / 0.1ft
Wed 20 May	High	02:13	3.5m / 11.6ft	96
	Low	08:43	-0.3m / -1.1ft
	High	15:00	3.0m / 9.9ft
	Low	20:56	0.1m / 0.4ft
Thu 21 May	High	03:11	3.4m / 11.2ft	89
	Low	09:40	-0.2m / -0.6ft
	High	15:59	2.9m / 9.7ft
	Low	21:56	0.2m / 0.8ft

Predictions: NOAA CO-OPS station 8443970 — heights relative to MLLW. · Not for navigation.

SOLUNAR FORECAST

Today's solunar windows

The angler tradition for major/minor fishing windows: major ≈3-hour windows around moon transit and opposition; minor ≈2-hour windows around moonrise and moonset. Times are America/New York local. Folk tradition, not a scientific forecast.

Major

21:29-00:29

09:57-12:57

Minor

03:08-05:08

18:01-20:01

7-day window outlook

Fri
2 M / 2 m
Sat
2 M / 1 m
Sun
2 M / 2 m
Mon
2 M / 2 m
Tue
2 M / 2 m
Wed
2 M / 2 m
Thu
2 M / 2 m

SPRING AND NEAP CYCLE

Cycle dates near Boston, MA

Next spring tide on Sun 17 May (range 4.1m / 13.5ft). Last neap on Fri 15 May. Next neap on Sun 24 May.

Spring tides cluster around new and full moons (biggest swings). Neap tides land on quarter moons (smallest swings). See the spring tide and neap tide glossary entries for the why.

EDITORIAL

About tides at Boston, MA

Boston has one of the larger tide ranges on the US East Coast — mean range about 2.9 metres, climbing past 3.4 metres on spring tides. The Atlantic comes in through Massachusetts Bay and Boston Harbor's geometry amplifies it. The pattern is semidiurnal: two highs and two lows roughly equal in size, a fresh cycle every twelve hours and twenty-five minutes. For anyone walking the HarborWalk, sea-kayaking from Spectacle Island, or watching the harbour seals at low water, the size of the swing changes the day. Tide flats off Wollaston and Squantum open up at low water and re-cover quickly on the flood. The Charles River dam at the head of the harbour decouples the river from the ocean tide, but everything seaward of it cycles fully. Predictions come from NOAA CO-OPS station 8443970 in the Inner Harbor. Nor'easters can stack water above predicted levels by 30 cm or more, especially when the storm coincides with spring tide and onshore wind.

COMMON QUESTIONS

Tide questions about Boston, MA

When is the next high tide at Boston?

The hero block shows the next high tide at Boston Inner Harbor in local Eastern time. The 7-day table below covers all four daily extremes — two highs and two lows — for the next week. For coastal-flood threats during nor'easters, the National Weather Service Boston office is the authoritative source.

Why is the tide range so big at Boston?

Massachusetts Bay funnels the open-Atlantic tide into a smaller area, raising the height of each cycle. The further north you go along the New England coast, the bigger the range becomes, peaking at the head of the Bay of Fundy. Boston's mean range is about 2.9 m — roughly twice the swing at New York Harbor and four times what San Diego sees.

When are the best low tides for clamming in Boston Harbor?

The biggest low tides — well below MLLW reference — cluster around new and full moons. The flats off Quincy, Hull, and the Boston Harbor Islands open up most fully on the lowest spring tides, especially in summer. The 7-day table on this page flags each day's lowest predicted tide; pair that with sunrise time on the sun/moon block above.

Where do these tide predictions come from?

NOAA CO-OPS station 8443970, Boston Inner Harbor. NOAA's harmonic predictions for Boston are calibrated against decades of gauge data and produce times accurate to a few minutes and heights to a few centimetres under normal weather. Storm surge during nor'easters can add 30 cm or more above predicted height.

Is this safe to use for navigation?

No. Use NOAA's authoritative chart products, official tide tables, and USCG notices for piloting. Boston Harbor traffic, the dredged main channel, and the strong currents through the President Roads area need real navigational sources, not a planning tool.

30-day tide table — Boston, MA

Heights relative to MLLW. Predictions: NOAA CO-OPS station 8443970 — heights relative to MLLW.

Day	Type	Time	Height
Fri 15 May	High	22:45	3.5m / 11.5ft
Sat 16 May	Low	05:13	-0.3m / -1.1ft
	High	11:22	3.1m / 10.2ft
	Low	17:24	-0.0m / -0.1ft
	High	23:33	3.6m / 11.8ft
Sun 17 May	Low	06:04	-0.4m / -1.4ft
	High	12:14	3.1m / 10.2ft
	Low	18:15	-0.0m / -0.1ft
Mon 18 May	High	00:24	3.6m / 12.0ft
	Low	06:56	-0.5m / -1.5ft
	High	13:08	3.1m / 10.2ft
	Low	19:07	-0.0m / -0.0ft
Tue 19 May	High	01:18	3.6m / 11.9ft
	Low	07:49	-0.4m / -1.4ft
	High	14:04	3.1m / 10.1ft
	Low	20:00	0.0m / 0.1ft
Wed 20 May	High	02:13	3.5m / 11.6ft
	Low	08:43	-0.3m / -1.1ft
	High	15:00	3.0m / 9.9ft
	Low	20:56	0.1m / 0.4ft
Thu 21 May	High	03:11	3.4m / 11.2ft
	Low	09:40	-0.2m / -0.6ft
	High	15:59	2.9m / 9.7ft
	Low	21:56	0.2m / 0.8ft
Fri 22 May	High	04:12	3.2m / 10.6ft
	Low	10:39	-0.0m / -0.1ft
	High	17:01	2.9m / 9.5ft
	Low	22:59	0.3m / 1.1ft
Sat 23 May	High	05:16	3.1m / 10.1ft
	Low	11:39	0.1m / 0.3ft
	High	18:03	2.9m / 9.5ft
Sun 24 May	Low	00:04	0.4m / 1.2ft
	High	06:21	2.9m / 9.7ft
	Low	12:39	0.2m / 0.6ft
	High	19:03	2.9m / 9.6ft
Mon 25 May	Low	01:09	0.4m / 1.2ft
	High	07:26	2.8m / 9.3ft
	Low	13:36	0.3m / 0.9ft
	High	20:00	3.0m / 9.7ft
Tue 26 May	Low	02:11	0.3m / 1.1ft
	High	08:28	2.8m / 9.1ft
	Low	14:31	0.4m / 1.2ft
	High	20:53	3.0m / 9.8ft
Wed 27 May	Low	03:10	0.3m / 0.9ft
	High	09:26	2.8m / 9.0ft
	Low	15:22	0.4m / 1.3ft
	High	21:41	3.0m / 10.0ft
Thu 28 May	Low	04:02	0.2m / 0.7ft
	High	10:16	2.7m / 9.0ft
	Low	16:08	0.4m / 1.4ft
	High	22:24	3.1m / 10.1ft
Fri 29 May	Low	04:47	0.2m / 0.5ft
	High	11:01	2.7m / 8.9ft
	Low	16:50	0.5m / 1.5ft
	High	23:04	3.1m / 10.1ft
Sat 30 May	Low	05:29	0.1m / 0.4ft
	High	11:43	2.7m / 8.9ft
	Low	17:30	0.5m / 1.6ft
	High	23:42	3.1m / 10.1ft
Sun 31 May	Low	06:08	0.1m / 0.4ft
	High	12:23	2.7m / 8.8ft
	Low	18:10	0.5m / 1.6ft
Mon 01 Jun	High	00:21	3.1m / 10.1ft
	Low	06:47	0.1m / 0.4ft
	High	13:03	2.7m / 8.8ft
	Low	18:50	0.5m / 1.7ft
Tue 02 Jun	High	01:00	3.1m / 10.0ft
	Low	07:26	0.2m / 0.5ft
	High	13:42	2.7m / 8.7ft
	Low	19:30	0.5m / 1.7ft
Wed 03 Jun	High	01:40	3.0m / 10.0ft
	Low	08:06	0.2m / 0.6ft
	High	14:22	2.6m / 8.7ft
	Low	20:11	0.6m / 1.8ft
Thu 04 Jun	High	02:21	3.0m / 9.8ft
	Low	08:46	0.2m / 0.7ft
	High	15:02	2.6m / 8.6ft
	Low	20:53	0.6m / 1.9ft
Fri 05 Jun	High	03:02	3.0m / 9.7ft
	Low	09:28	0.2m / 0.8ft
	High	15:44	2.6m / 8.6ft
	Low	21:38	0.6m / 1.9ft
Sat 06 Jun	High	03:46	2.9m / 9.5ft
	Low	10:11	0.3m / 0.9ft
	High	16:28	2.7m / 8.7ft
	Low	22:27	0.6m / 1.9ft
Sun 07 Jun	High	04:34	2.9m / 9.4ft
	Low	10:57	0.3m / 1.0ft
	High	17:13	2.7m / 9.0ft
	Low	23:18	0.5m / 1.7ft
Mon 08 Jun	High	05:24	2.8m / 9.3ft
	Low	11:44	0.3m / 1.0ft
	High	18:00	2.8m / 9.3ft
Tue 09 Jun	Low	00:12	0.4m / 1.5ft
	High	06:18	2.8m / 9.2ft
	Low	12:33	0.3m / 1.0ft
	High	18:48	2.9m / 9.7ft
Wed 10 Jun	Low	01:07	0.3m / 1.1ft
	High	07:13	2.8m / 9.2ft
	Low	13:24	0.3m / 0.9ft
	High	19:39	3.1m / 10.2ft
Thu 11 Jun	Low	02:03	0.2m / 0.6ft
	High	08:10	2.8m / 9.3ft
	Low	14:18	0.2m / 0.8ft
	High	20:31	3.3m / 10.7ft
Fri 12 Jun	Low	03:01	0.0m / 0.0ft
	High	09:08	2.9m / 9.4ft
	Low	15:12	0.2m / 0.6ft
	High	21:25	3.4m / 11.2ft
Sat 13 Jun	Low	03:57	-0.2m / -0.5ft
	High	10:06	2.9m / 9.6ft
	Low	16:07	0.1m / 0.4ft
	High	22:18	3.5m / 11.6ft

Not for navigation. Generated 2026-05-16T03:20:12.432Z.

Predictions: NOAA CO-OPS station 8443970 — heights relative to MLLW.

Methodology Glossary

Not for navigation. Page generated 2026-05-16T03:20:12.432Z. Predictions refresh daily.