Measurements:
°C
°F
Martha's Vineyard
66°F
SW 11 mph
Feels like: 66°F
Precip: 3%
World Resorts USA Martha's Vineyard Weather

Martha's Vineyard Sea Water Temperature

Current Sea Water Temperature:
+70.6°F
Maximum Sea Water Temperature in September: 77.0°F
Minimum Sea Water Temperature in September: 63.6°F
Average water temperature in September: 71.2°F

Sea Water Temperature for the Last 10 Days:

September 15 70.6°F September 10 70.4°F
September 14 71.4°F September 09 70.8°F
September 13 71.6°F September 08 70.8°F
September 12 70.8°F September 07 71.4°F
September 11 71.4°F September 06 72.0°F

When is the Warmest Sea for Martha's Vineyard?

According to our data for the last three years for Martha's Vineyard 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: 2026 2025 2024

The average sea surface temperature in August 2026 for Martha's Vineyard was 73.0°F. The maximum and minimum values were 71.2°F and 74.8°F respectively.

Sea Water Temperature in July

Select Year: 2026 2025 2024

The average sea surface temperature in July 2026 for Martha's Vineyard was 70.7°F. The maximum and minimum values were 68.2°F and 73.8°F respectively.

Sea Water Temperature in September

Select Year: 2026 2025 2024

The average sea surface temperature in September 2026 for Martha's Vineyard was 71.4°F. The maximum and minimum values were 70.4°F and 73.0°F respectively.

Best Time to Visit Martha's Vineyard
The most sunny months:
November 15 days
October 14 days
June 14 days
The most warm months:
July 77.7 °F
August 77.0 °F
September 71.4 °F
Warmest sea temperature:
August 74.1 °F
July 72.5 °F
September 71.1 °F
The most cold months:
February 35.1 °F
January 35.1 °F
December 41.5 °F
The most rainy months:
January 3 days
October 3 days
July 2 days
The most windy months:
December 14 mph
January 14 mph
November 14 mph

Martha's Vineyard on the Weather Map

USA Resorts:
NAME
Boston +64
Chicago +66
Hawaii +80
Las Vegas +80
Los Angeles +74
Maui +66
Miami +92
Myrtle Beach +88
New York +72
Panama City Beach +90
San Diego +72
San Francisco +60
Santa Monica +72
Sarasota +94
Washington +76
24 Hours Weather Forecast
Martha's Vineyard
Local time: 11:13
15 sep, tuesday
1200 66°F
SW
11 mph
1500 68°F
SW
9 mph
1800 66°F
W
9 mph
2100 64°F
W
7 mph
16 sep, wednesday
0000 62°F
NW
6 mph
0300 62°F
N
5 mph
0600 62°F
NE
4 mph
0900 66°F
NE
6 mph