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Boston, MA · Massachusetts · united-states

Tide is currently falling — next low in 3h 44m

2.95 m / 9.7ft
Next high · 21:26 GMT-4
Heights relative to MLLW · 2026-04-27Coef. 88Solunar 3/5

Tide times at Boston, MA on Monday, 27 April 2026: first low tide at 02:33am, first high tide at 08:54am, second low tide at 03:04pm, second high tide at 09:26pm. Sunrise 05:44am, sunset 07:39pm.

TIDE CURVE

Next 24 hours at Boston, MA

-0.1 m1.6 m3.2 mHeight (MLLW)12:0016:0020:0000:0004:0008:00L 15:04H 21:26L 03:33H 09:51nowTime (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.

TODAY'S HIGHLIGHTS

Sun, moon and conditions on Mon 27 Apr

Sunrise
05:44
Sunset
19:39
Moon
Waxing gibbous
83% illuminated
Coefficient
88
Spring cycle
7-DAY OUTLOOK

Highs and lows next 7 days

Today
2.9m / 9.7ft21:26
0.2m / 0.7ft15:04
Coef. 89
Tue
2.9m / 9.5ft09:51
0.2m / 0.7ft03:33
Coef. 91
Wed
2.9m / 9.5ft10:40
0.1m / 0.4ft04:25
Coef. 97
Thu
2.9m / 9.5ft11:24
0.0m / 0.2ft05:10
Coef. 100
Fri
2.9m / 9.4ft12:05
0.0m / 0.0ft05:51
Coef. 93
Sat
3.1m / 10.3ft00:09
0.0m / 0.0ft06:30
Coef. 101
Sun
3.1m / 10.2ft00:46
0.0m / 0.1ft07:09
Coef. 99
All extrema (7 days)
DayTypeTimeHeightCoef.
Mon 27 AprLow15:040.2m / 0.7ft89
High21:262.9m / 9.7ft
Tue 28 AprLow03:330.2m / 0.7ft91
High09:512.9m / 9.5ft
Low15:550.2m / 0.7ft
High22:133.0m / 10.0ft
Wed 29 AprLow04:250.1m / 0.4ft97
High10:402.9m / 9.5ft
Low16:400.2m / 0.8ft
High22:553.1m / 10.2ft
Thu 30 AprLow05:100.0m / 0.2ft100
High11:242.9m / 9.5ft
Low17:200.3m / 0.9ft
High23:333.1m / 10.2ft
Fri 01 MayLow05:510.0m / 0.0ft93
High12:052.9m / 9.4ft
Low17:590.3m / 1.0ft
Sat 02 MayHigh00:093.1m / 10.3ft101
Low06:300.0m / 0.0ft
High12:452.8m / 9.2ft
Low18:370.4m / 1.2ft
Sun 03 MayHigh00:463.1m / 10.2ft99
Low07:090.0m / 0.1ft
High13:242.8m / 9.1ft
Low19:160.4m / 1.4ft

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

SOLUNAR FORECAST

Fishing windows · 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.

SPRING AND NEAP CYCLE

Cycle dates near Boston, MA

Next spring tide on Thu 30 Apr (range 3.1m / 10.2ft). Last neap on Sun 26 Apr. Next neap on Sat 09 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.

DayTypeTimeHeight
Mon 27 AprLow02:330.3m / 1.1ft
High08:542.9m / 9.5ft
Low15:040.2m / 0.7ft
High21:262.9m / 9.7ft
Tue 28 AprLow03:330.2m / 0.7ft
High09:512.9m / 9.5ft
Low15:550.2m / 0.7ft
High22:133.0m / 10.0ft
Wed 29 AprLow04:250.1m / 0.4ft
High10:402.9m / 9.5ft
Low16:400.2m / 0.8ft
High22:553.1m / 10.2ft
Thu 30 AprLow05:100.0m / 0.2ft
High11:242.9m / 9.5ft
Low17:200.3m / 0.9ft
High23:333.1m / 10.2ft
Fri 01 MayLow05:510.0m / 0.0ft
High12:052.9m / 9.4ft
Low17:590.3m / 1.0ft
Sat 02 MayHigh00:093.1m / 10.3ft
Low06:300.0m / 0.0ft
High12:452.8m / 9.2ft
Low18:370.4m / 1.2ft
Sun 03 MayHigh00:463.1m / 10.2ft
Low07:090.0m / 0.1ft
High13:242.8m / 9.1ft
Low19:160.4m / 1.4ft
Mon 04 MayHigh01:243.1m / 10.1ft
Low07:490.1m / 0.3ft
High14:032.7m / 8.9ft
Low19:550.5m / 1.6ft
Tue 05 MayHigh02:043.0m / 9.9ft
Low08:290.2m / 0.6ft
High14:442.6m / 8.6ft
Low20:360.5m / 1.8ft
Wed 06 MayHigh02:452.9m / 9.7ft
Low09:110.3m / 0.8ft
High15:272.6m / 8.4ft
Low21:190.6m / 2.0ft
Thu 07 MayHigh03:282.9m / 9.4ft
Low09:560.3m / 1.1ft
High16:122.5m / 8.3ft
Low22:060.7m / 2.2ft
Fri 08 MayHigh04:162.8m / 9.2ft
Low10:440.4m / 1.3ft
High17:012.5m / 8.2ft
Low22:570.7m / 2.3ft
Sat 09 MayHigh05:072.8m / 9.1ft
Low11:340.4m / 1.3ft
High17:522.5m / 8.3ft
Low23:520.7m / 2.2ft
Sun 10 MayHigh06:012.8m / 9.0ft
Low12:250.4m / 1.3ft
High18:422.6m / 8.6ft
Mon 11 MayLow00:460.6m / 1.9ft
High06:562.8m / 9.1ft
Low13:150.4m / 1.2ft
High19:322.8m / 9.0ft
Tue 12 MayLow01:420.4m / 1.5ft
High07:512.8m / 9.2ft
Low14:060.3m / 1.0ft
High20:212.9m / 9.6ft
Wed 13 MayLow02:370.3m / 0.8ft
High08:462.9m / 9.5ft
Low14:560.2m / 0.7ft
High21:093.1m / 10.2ft
Thu 14 MayLow03:300.0m / 0.2ft
High09:393.0m / 9.7ft
Low15:460.1m / 0.4ft
High21:573.3m / 10.9ft
Fri 15 MayLow04:22-0.2m / -0.5ft
High10:313.0m / 10.0ft
Low16:350.0m / 0.1ft
High22:453.5m / 11.5ft
Sat 16 MayLow05:13-0.3m / -1.1ft
High11:223.1m / 10.2ft
Low17:24-0.0m / -0.1ft
High23:333.6m / 11.8ft
Sun 17 MayLow06:04-0.4m / -1.4ft
High12:143.1m / 10.2ft
Low18:15-0.0m / -0.1ft
Mon 18 MayHigh00:243.6m / 12.0ft
Low06:56-0.5m / -1.5ft
High13:083.1m / 10.2ft
Low19:07-0.0m / -0.0ft
Tue 19 MayHigh01:183.6m / 11.9ft
Low07:49-0.4m / -1.4ft
High14:043.1m / 10.1ft
Low20:000.0m / 0.1ft
Wed 20 MayHigh02:133.5m / 11.6ft
Low08:43-0.3m / -1.1ft
High15:003.0m / 9.9ft
Low20:560.1m / 0.4ft
Thu 21 MayHigh03:113.4m / 11.2ft
Low09:40-0.2m / -0.6ft
High15:592.9m / 9.7ft
Low21:560.2m / 0.8ft
Fri 22 MayHigh04:123.2m / 10.6ft
Low10:39-0.0m / -0.1ft
High17:012.9m / 9.5ft
Low22:590.3m / 1.1ft
Sat 23 MayHigh05:163.1m / 10.1ft
Low11:390.1m / 0.3ft
High18:032.9m / 9.5ft
Sun 24 MayLow00:040.4m / 1.2ft
High06:212.9m / 9.7ft
Low12:390.2m / 0.6ft
High19:032.9m / 9.6ft
Mon 25 MayLow01:090.4m / 1.2ft
High07:262.8m / 9.3ft
Low13:360.3m / 0.9ft
High20:003.0m / 9.7ft
Tue 26 MayLow02:110.3m / 1.1ft
High08:282.8m / 9.1ft
Low14:310.4m / 1.2ft
High20:533.0m / 9.8ft

Not for navigation. Generated 2026-04-27T15:20:29.088Z.

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

Not for navigation. Page generated 2026-04-27T15:20:29.088Z. Predictions refresh daily.