Martha's Vineyard weather by month & the best time to visit
United States · seaside town · humid subtropical climate
The best time to visit Martha's Vineyard is July — its sunniest month (Sunshine Score 77/100), with August and June close behind. Martha's Vineyard averages about 2,196 hours of sunshine a year. Daytime highs around 24°C / 75°F and roughly 79 mm of rain in July.
When is the best time to visit Martha's Vineyard?
For sunshine, the best time to visit Martha's Vineyard is July, then August and June. The dullest month is January (0/100, 90 mm of rain). The full month-by-month picture is in the table below.
How sunny is Martha's Vineyard?
Martha's Vineyard gets a moderate 2,196 hours of sunshine a year. 77 Sunshine Score points separate July (77) from January (0), so the month you pick matters. It ranks #322 of 580 destinations in United States for annual sunshine, below the national median of 2,279 hours. The year's 1,155 mm of rain spreads fairly evenly across the months, with no pronounced dry season.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 0 | 3° / 37°F | -2° / 28°F | 90 mm | 1 | 6° / 43°F |
| February | 0 | 3° / 37°F | -2° / 28°F | 84 mm | 2 | 4° / 39°F |
| March | 0 | 5° / 41°F | 1° / 34°F | 109 mm | 3 | 5° / 41°F |
| April | 12 | 10° / 50°F | 5° / 41°F | 103 mm | 5 | 8° / 46°F |
| May | 38 | 14° / 57°F | 10° / 50°F | 86 mm | 6 | 12° / 54°F |
| June | 75 | 20° / 68°F | 15° / 59°F | 92 mm | 7 | 17° / 63°F |
| July | 77 | 24° / 75°F | 20° / 68°F | 79 mm | 7 | 21° / 70°F |
| August | 77 | 24° / 75°F | 20° / 68°F | 78 mm | 6 | 21° / 70°F |
| September | 74 | 21° / 70°F | 17° / 63°F | 96 mm | 5 | 20° / 68°F |
| October | 47 | 16° / 61°F | 12° / 54°F | 118 mm | 3 | 17° / 63°F |
| November | 18 | 11° / 52°F | 6° / 43°F | 105 mm | 2 | 13° / 55°F |
| December | 0 | 7° / 45°F | 2° / 36°F | 115 mm | 1 | 8° / 46°F |
Sea temperature in Martha's Vineyard by month
The sea off Martha's Vineyard is warmest in July at around 21°C / 70°F, and coolest in February at 4°C / 39°F. The water sits at a comfortable 21°C or warmer roughly 2 months a year. Month-by-month sea-surface temperatures are in the Sea column of the table above.
Nearest destinations
Head-to-head
How Martha's Vineyard compares month by month: Martha's Vineyard vs Boston · Martha's Vineyard vs Providence/Warwick · Martha's Vineyard vs Nantucket · Martha's Vineyard vs Hamilton (Bermuda) · all comparisons
Martha's Vineyard: questions and answers
What kind of destination is Martha's Vineyard?
Martha's Vineyard is a seaside town in United States with a humid subtropical climate — the sea reaches 21°C at its warmest and is swimmable (21°C+) about 2 months a year.
How many hours of sunshine does Martha's Vineyard get a year?
Martha's Vineyard gets about 2,196 hours of sunshine a year, at its best around July.
When is the best time to visit Martha's Vineyard?
The sunniest time to visit Martha's Vineyard is July, when the Sunshine Score peaks at 77/100 (with August and June close behind). Expect daytime highs around 24°C / 75°F.
What is the least sunny month in Martha's Vineyard?
January is the least sunny month in Martha's Vineyard, scoring 0/100 with about 90 mm of rain.
What is the sea temperature in Martha's Vineyard?
The sea in Martha's Vineyard ranges from about 4°C (February) to 21°C (July). Month-by-month sea temperatures are on this page.
How strong is the sun in Martha's Vineyard?
The typical midday UV index in Martha's Vineyard peaks around 7 (high) in June, easing to about 1 (low) in January. Month-by-month midday UV values are in the UV column of the table on this page.
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