Martha's Vineyard weather in August 2025

Q: How hot is it in Martha's Vineyard in August?

Daytime temperatures usually reach 25°C in Martha's Vineyard in August with low heat and humidity, falling to 17°C at night.

Q: How sunny is it in Martha's Vineyard in August?

There are normally 8 hours of bright sunshine each day in Martha's Vineyard in August - that's 58% of daylight hours.

Q: How warm is the sea around Martha's Vineyard in August?

The average sea temperature around Martha's Vineyard in August is 20°C.

Q: Does it rain in Martha's Vineyard in August?

There are usually 10 days with some rain in Martha's Vineyard in August and the average monthly rainfall is 104mm.

Q: What is the chance of a cyclone in Martha's Vineyard in August?

On average less than 1 day in August in Martha's Vineyard is likely to be affected by the passage of one or more tropical storms.

Expect 77°F daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Martha's Vineyard in August. Check more long-term weather averages for Martha's Vineyard in August before you book your next holiday to Massachusetts in 2025/2026.

77
77°F max day temperature
8
8 hours of sunshine per day
10
10 days with some rainfall
63
63°F min night temperature
14
14 hours of daylight per day
L
Low heat & humidity
4.1
4.1 inches of monthly rainfall
8
8 (Very High) UV index
68
68°F sea temperature

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The August weather guide for Massachusetts (Martha's Vineyard) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C) | Imperial (°F)

More about the USA

How hot is it in Martha's Vineyard in August?

Daytime temperatures usually reach 77°F in Martha's Vineyard in August with low heat and humidity, falling to 63°F at night.

How sunny is it in Martha's Vineyard in August?

There are normally 8 hours of bright sunshine each day in Martha's Vineyard in August - that's 58% of daylight hours.

How warm is the sea around Martha's Vineyard in August?

The average sea temperature around Martha's Vineyard in August is 68°F.

Does it rain in Martha's Vineyard in August?

There are usually 10 days with some rain in Martha's Vineyard in August and the average monthly rainfall is 4.1 inches.

What is the chance of a hurricane in Martha's Vineyard in August?

On average less than 1 day in August in Martha's Vineyard is likely to be affected by the passage of one or more tropical storms.

Martha's Vineyard August sunrise & sunset times

Browse the sunrise and sunset times for Martha's Vineyard in August 2025. Select a month to view Martha's Vineyard sunrise and sunset times for the next 12 months.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Date	Sunrise times	Sunset times
Friday, 1st August 2025	04:38	18:59
Saturday, 16th August 2025	04:53	18:40
Sunday, 31st August 2025	05:08	18:17

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Massachusetts - quick facts
Flight time^✝	7.5 hours
Time difference	UK -5 hours
Language(s)	English
Currency	US Dollar
Electricity	A + B plug (120V)
Driving side	Right
Visa^✝	Yes
Why visit?	Culture Nightlife
Tourist info	Visit Massachusetts