Sea temperature Boston today
United States
Sea temperature for 0 days
water low / highWaves
– m
Swell
– m
Sea current
– km/h
Wind
– km/h
Sea temperature Boston by month
- 4°Jan
- 3°Feb
- 5°Mar
- 8°Apr
- 13°May
- 17°Jun
- 19°Jul
- 20°Aug
- 19°Sep
- 15°Oct
- 10°Nov
- 6°Dec
Long-term averages, the current month is highlighted.
When to swim in Boston?
Swimming seasonJul – SepSea temperature above 18 °C
Warmest monthAugAverage 20 °C
Coldest monthFebAverage 3 °C
Annual average11.5 °CAverage sea temperature