Current sea water temperature:
+66.2°F
| Minimum sea water temperature in September: | 71.6°F |
| Maximum sea water temperature in September: | 58.6°F |
| Average sea water temperature in September: | 64.4°F |
| more information | |
14 days
forecast
forecast
| Boston |
monthly
weather
weather
| Boston |
Sea water temperature for the last 10 days:
| September 14 | 66.2°F | September 9 | 64.6°F |
| September 13 | 65.5°F | September 8 | 65.5°F |
| September 12 | 67.3°F | September 7 | 65.7°F |
| September 11 | 66.6°F | September 6 | 67.6°F |
| September 10 | 66.0°F | September 5 | 66.6°F |
Monthly sea water temperature, °F
When is the warmest sea in Boston?
Based on the data about daily sea water temperature for the last three years the warmest sea in Boston was noticed in August, July and September.
Monthly Sea Temperatures in Boston, °F
Sea water temperature in August, °F
Show year:
2026
2025
2024
The average sea water temperature in August of 2026 was 68.4°F. The highest and lowest sea temperatures during the month were 71.4°F and 66.0°F.
Sea water temperature in July, °F
Show year:
2026
2025
2024
The average sea water temperature in July of 2026 was 67.1°F. The highest and lowest sea temperatures during the month were 70.9°F and 63.3°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 63.7°F. The highest and lowest sea temperatures during the month were 66.7°F and 60.1°F.
current
weather
weather
| Boston |
weather in
September
September
| Boston |
Best time for vacation in Boston
Boston on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Boston
Local time: 16:40
September 14, monday
1800
68°F
SE
10 mph
10 mph
2100
63°F
SE
7 mph
7 mph
September 15, tuesday
0000
59°F
SW
6 mph
6 mph
0300
57°F
S
9 mph
9 mph
0600
55°F
SW
8 mph
8 mph
0900
61°F
SW
9 mph
9 mph
1200
63°F
SW
6 mph
6 mph
1500
64°F
W
7 mph
7 mph
