Measurements:
°C
°F
Block Island
20°F
SE 20 mph
Feels like: 2°F
Precip: 0%
World Resorts USA Block Island Weather

Block Island Sea Water Temperature

Current Sea Water Temperature:
+46.8°F
Maximum Sea Water Temperature in December: 55.6°F
Minimum Sea Water Temperature in December: 44.6°F
Average water temperature in December: 50.7°F

Sea Water Temperature for the Last 10 Days:

December 22 46.8°F December 17 48.6°F
December 21 48.8°F December 16 49.0°F
December 20 48.8°F December 15 49.6°F
December 19 49.6°F December 14 49.4°F
December 18 48.4°F December 13 50.2°F

When is the Warmest Sea for Block Island?

According to our data for the last three years for Block Island the highest average sea water temperature was in August, July and September.

Average Water Temperature by Month, °F

Sea Water Temperature in August

Select Year: 2024 2023 2022

The average sea surface temperature in August 2024 for Block Island was 71.7°F. The maximum and minimum values were 69.6°F and 73.8°F respectively.

Sea Water Temperature in July

Select Year: 2024 2023 2022

The average sea surface temperature in July 2024 for Block Island was 70.6°F. The maximum and minimum values were 64.8°F and 73.6°F respectively.

Sea Water Temperature in September

Select Year: 2024 2023 2022

The average sea surface temperature in September 2024 for Block Island was 68.4°F. The maximum and minimum values were 65.8°F and 70.6°F respectively.

Best Time to Visit Block Island
The most sunny months:
November 15 days
September 14 days
June 14 days
The most warm months:
July 77.7 °F
August 76.8 °F
September 70.8 °F
Warmest sea temperature:
August 72.5 °F
July 70.7 °F
September 70.4 °F
The most cold months:
February 36.5 °F
January 36.6 °F
March 42.0 °F
The most rainy months:
October 4 days
February 3 days
January 3 days
The most windy months:
November 15 mph
December 15 mph
March 14 mph

Block Island on the Weather Map

USA Resorts:
NAME
Boston +10
Chicago +20
Hawaii +78
Honolulu +78
Houston +46
Las Vegas +50
Los Angeles +54
Miami +62
New York +16
Orlando +50
San Diego +54
San Francisco +54
Sarasota +48
Tampa +46
Washington +20
24 Hours Weather Forecast
Block Island
Local time: 05:12
22 dec, sunday
0600 20°F
SE
20 mph
0900 18°F
SE
19 mph
1200 22°F
SE
17 mph
1500 26°F
SE
16 mph
1800 28°F
S
16 mph
2100 24°F
S
16 mph
23 dec, monday
0000 22°F
S
11 mph
0300 20°F
S
9 mph