Current sea water temperature:
+48.4°F
| Minimum sea water temperature in December: | 55.0°F |
| Maximum sea water temperature in December: | 45.1°F |
| Average sea water temperature in December: | 50.3°F |
| more information | |
14 days
forecast
forecast
| Block Island |
monthly
weather
weather
| Block Island |
Sea water temperature for the last 10 days:
| December 14 | 48.4°F | December 9 | 49.3°F |
| December 13 | 47.7°F | December 8 | 49.6°F |
| December 12 | 49.1°F | December 7 | 49.8°F |
| December 11 | 49.3°F | December 6 | 50.2°F |
| December 10 | 49.6°F | December 5 | 50.4°F |
Monthly sea water temperature, °F
When is the warmest sea in Block Island?
Based on the data about daily sea water temperature for the last three years the warmest sea in Block Island was noticed in August, July and September.
Monthly Sea Temperatures in Block Island, °F
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 69.0°F. The highest and lowest sea temperatures during the month were 71.1°F and 66.9°F.
Sea water temperature in July, °F
Show year:
2025
2024
2023
The average sea water temperature in July of 2025 was 68.5°F. The highest and lowest sea temperatures during the month were 71.6°F and 65.1°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 68.0°F. The highest and lowest sea temperatures during the month were 68.9°F and 66.6°F.
current
weather
weather
| Block Island |
weather in
December
December
| Block Island |
Best time for vacation in Block Island
Block Island on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Block Island
Local time: 01:44
December 15, monday
0300
19°F
SE
25 mph
25 mph
0600
18°F
SE
25 mph
25 mph
0900
21°F
SE
25 mph
25 mph
1200
28°F
SE
25 mph
25 mph
1500
30°F
SE
25 mph
25 mph
1800
32°F
E
21 mph
21 mph
2100
32°F
E
19 mph
19 mph
December 16, tuesday
0000
34°F
E
20 mph
20 mph
