Current sea water temperature:
+40.8°F
| Minimum sea water temperature in January: | 46.8°F |
| Maximum sea water temperature in January: | 38.3°F |
| Average sea water temperature in January: | 42.7°F |
| more information | |
14 days
forecast
forecast
| Groton |
monthly
weather
weather
| Groton |
Sea water temperature for the last 10 days:
| January 8 | 40.8°F | January 3 | 41.2°F |
| January 7 | 39.9°F | January 2 | 41.0°F |
| January 6 | 39.9°F | January 1 | 41.7°F |
| January 5 | 40.3°F | December 31 | 41.9°F |
| January 4 | 40.5°F | December 30 | 42.6°F |
Monthly sea water temperature, °F
When is the warmest sea in Groton?
Based on the data about daily sea water temperature for the last three years the warmest sea in Groton was noticed in August, July and September.
Monthly Sea Temperatures in Groton, °F
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 70.3°F. The highest and lowest sea temperatures during the month were 74.1°F and 68.7°F.
Sea water temperature in July, °F
Show year:
2025
2024
2023
The average sea water temperature in July of 2025 was 69.9°F. The highest and lowest sea temperatures during the month were 72.7°F and 65.7°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 68.8°F. The highest and lowest sea temperatures during the month were 70.9°F and 67.6°F.
current
weather
weather
| Groton |
weather in
January
January
| Groton |
Best time for vacation in Groton
Groton on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Groton
Local time: 06:20
January 08, thursday
0900
36°F
SE
8 mph
8 mph
1200
45°F
SE
11 mph
11 mph
1500
48°F
SE
7 mph
7 mph
1800
43°F
SE
5 mph
5 mph
2100
36°F
SE
4 mph
4 mph
January 09, friday
0000
34°F
E
2 mph
2 mph
0300
34°F
E
2 mph
2 mph
0600
32°F
N
2 mph
2 mph
