Swimming in Boston in september 2025: Average sea temperature in september and tide times in september 2025
Average sea temperature in Boston in september 2025.
In september, according to seasonal norms, the sea temperature in Boston is:
Minimum: 62°F
Average: 65°F
Maximum: 68°F
Other useful seasonal weather averages in september:
- Outside temperature: 63°F to 75°F
- Most common weather: "Clear/Sunny"
- The wind blows at 10.6mph
- It rains a total of 3.1in, over 4 day(s).
Should we swim in Boston in september?
Yes... and no. The water temperature in Boston in september is cool
Swimming in september on the beaches of Boston is possible but the sea water is cool. So even though the sea temperature sometimes climbs to 68°F, it can also be as low as 62°F! Note that the average is 65°F.
Note also that in september, the climate is good with an average outside temperature of 69°F, 3.1in of precipitation (over 4 days) and 81.05 % humidity.
Water and normal seasonal temperatures in Boston in september
| September | |||
| Average sea temperature | 65°F | ||
| Minimum sea temperature | 62°F | ||
| Maximum sea temperature | 68°F | ||
| Average outside temperature | 70°F | ||
| Maximum outside temperature | 76°F | ||
| Minimum outside temperature | 63°F | ||
| Wind speed | 9.3mph | ||
| Wind temperature | 63°F | ||
| Precipitation | 3.1in | ||
| Number of days of rain | 4 jour(s) (13%) | ||
| Humidity | 82% | ||
| Visibility in kilometers | 9.09km | ||
| Cloud cover | 36% | ||
| Our opinion | cool swimming |
Chart of the tides in september 2025
Tide times in september 2025 in Boston
Swim elsewhere in the United States (USA) in september
Swim in the United States (USA) in september: sea temperature by city