TideTurtle mascotTideTurtle

Next high tide at Boston, MA: 20:31 GMT-4, 2.85 m

Heights relative to MLLW. 2026-04-26.

Tide curve — next 24 hours

-0.1 m1.6 m3.2 mHeight (MLLW)16:0020:0000:0004:0008:0012:00L 14:07H 20:31L 02:33H 08:54nowTime (America/New_York)

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.

7-day tide table

DayTypeTimeHeight
Sun 26 AprLow14:070.21 m
High20:312.85 m
Mon 27 AprLow02:330.33 m
High08:542.89 m
Low15:040.22 m
High21:262.95 m
Tue 28 AprLow03:330.22 m
High09:512.90 m
Low15:550.22 m
High22:133.04 m
Wed 29 AprLow04:250.12 m
High10:402.91 m
Low16:400.23 m
High22:553.10 m
Thu 30 AprLow05:100.05 m
High11:242.90 m
Low17:200.26 m
High23:333.12 m
Fri 01 MayLow05:510.01 m
High12:052.87 m
Low17:590.30 m
Sat 02 MayHigh00:093.13 m
Low06:300.01 m
High12:452.82 m
Low18:370.35 m

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

Sun & moon today

Sunrise
05:46
Sunset
19:38
Moonrise
14:41
Moonset
03:27
Moon phase
Waxing gibbous (75% illuminated)

Current conditions

Conditions data not available for this station. Wind, swell and water temperature ride along with Open-Meteo Marine; gauge-only stations like the UK EA Flood network publish water level only.

Solunar 7-day rating

The angler tradition that rates each day for fish-bite likelihood using moon transits and rise/set. One to five stars. Not a scientific forecast.

  • Sun
    ★★★★★
  • Mon
    ★★★★★
  • Tue
    ★★★★★
  • Wed
    ★★★★★
  • Thu
    ★★★★★
  • Fri
    ★★★★★
  • Sat
    ★★★★★

Best windows Sun 26 Apr

Suggested time slots at Boston, MA, derived from the tide, sun, moon, and conditions data on this page. Rough guidance, not a forecast.

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 about tides at 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.

DayTypeTimeHeight
Sun 26 AprLow14:070.21 m
High20:312.85 m
Mon 27 AprLow02:330.33 m
High08:542.89 m
Low15:040.22 m
High21:262.95 m
Tue 28 AprLow03:330.22 m
High09:512.90 m
Low15:550.22 m
High22:133.04 m
Wed 29 AprLow04:250.12 m
High10:402.91 m
Low16:400.23 m
High22:553.10 m
Thu 30 AprLow05:100.05 m
High11:242.90 m
Low17:200.26 m
High23:333.12 m
Fri 01 MayLow05:510.01 m
High12:052.87 m
Low17:590.30 m
Sat 02 MayHigh00:093.13 m
Low06:300.01 m
High12:452.82 m
Low18:370.35 m
Sun 03 MayHigh00:463.10 m
Low07:090.04 m
High13:242.76 m
Low19:160.41 m
Mon 04 May—
Tue 05 May—
Wed 06 May—
Thu 07 May—
Fri 08 May—
Sat 09 May—
Sun 10 May—
Mon 11 May—
Tue 12 May—
Wed 13 May—
Thu 14 May—
Fri 15 May—
Sat 16 May—
Sun 17 May—
Mon 18 May—
Tue 19 May—
Wed 20 May—
Thu 21 May—
Fri 22 May—
Sat 23 May—
Sun 24 May—
Mon 25 May—

Not for navigation. Generated 2026-04-26T16:21:12.420Z.

Read about how these predictions are made on the methodology page. Unfamiliar with terms like spring tide or datum? See the glossary.

Not for navigation. Page generated 2026-04-26T16:21:12.420Z. Predictions refresh daily.