Current sea water temperature:
+51.8°F
| Minimum sea water temperature in May: | 57.7°F |
| Maximum sea water temperature in May: | 45.5°F |
| Average sea water temperature in May: | 51.0°F |
| more information | |
14 days
forecast
forecast
| Block Island |
monthly
weather
weather
| Block Island |
Sea water temperature for the last 10 days:
| May 19 | 51.8°F | May 14 | 48.4°F |
| May 18 | 50.5°F | May 13 | 48.4°F |
| May 17 | 49.6°F | May 12 | 48.6°F |
| May 16 | 49.5°F | May 11 | 48.2°F |
| May 15 | 48.2°F | May 10 | 47.7°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
May
May
| 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: 10:01
May 19, tuesday
1200
61°F
NE
16 mph
16 mph
1500
61°F
NE
17 mph
17 mph
1800
59°F
NE
22 mph
22 mph
2100
59°F
NE
19 mph
19 mph
May 20, wednesday
0000
59°F
NE
18 mph
18 mph
0300
59°F
NE
16 mph
16 mph
0600
57°F
NE
16 mph
16 mph
0900
59°F
NE
15 mph
15 mph
