Current sea water temperature:
+41.7°F
| Minimum sea water temperature in December: | 50.2°F |
| Maximum sea water temperature in December: | 37.9°F |
| Average sea water temperature in December: | 44.9°F |
| more information | |
14 days
forecast
forecast
| Boston |
monthly
weather
weather
| Boston |
Sea water temperature for the last 10 days:
| December 25 | 41.7°F | December 20 | 41.4°F |
| December 24 | 41.5°F | December 19 | 40.8°F |
| December 23 | 41.2°F | December 18 | 42.1°F |
| December 22 | 41.2°F | December 17 | 42.4°F |
| December 21 | 41.2°F | December 16 | 42.4°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:
2025
2024
2023
The average sea water temperature in August of 2025 was 67.2°F. The highest and lowest sea temperatures during the month were 70.5°F and 64.9°F.
Sea water temperature in July, °F
Show year:
2025
2024
2023
The average sea water temperature in July of 2025 was 67.1°F. The highest and lowest sea temperatures during the month were 70.0°F and 63.7°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
December
December
| Boston |
Best time for vacation in Boston
Boston on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Boston
Local time: 09:54
December 25, thursday
1200
36°F
E
11 mph
11 mph
1500
37°F
E
8 mph
8 mph
1800
34°F
SE
14 mph
14 mph
2100
25°F
SE
17 mph
17 mph
December 26, friday
0000
19°F
SE
17 mph
17 mph
0300
14°F
SE
14 mph
14 mph
0600
12°F
SE
12 mph
12 mph
0900
14°F
SE
9 mph
9 mph
