Nantucket weather by month & the best time to visit
United States · seaside town · oceanic / maritime climate
The best time to visit Nantucket is July — its sunniest month (Sunshine Score 78/100), with August and September close behind. Nantucket averages about 2,196 hours of sunshine a year. Daytime highs around 21°C / 70°F and roughly 72 mm of rain in July.
When is the best time to visit Nantucket?
For sunshine, the best time to visit Nantucket is July, then August and September. The dullest month is January (0/100, 91 mm of rain). The full month-by-month picture is in the table below.
How sunny is Nantucket?
Nantucket gets a moderate 2,196 hours of sunshine a year. 78 Sunshine Score points separate July (78) from January (0), so the month you pick matters. It ranks #321 of 580 destinations in United States for annual sunshine, below the national median of 2,279 hours. The year's 1,126 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 | 4° / 39°F | 0° / 32°F | 91 mm | 1 | 6° / 43°F |
| February | 0 | 4° / 39°F | 0° / 32°F | 87 mm | 2 | 4° / 39°F |
| March | 0 | 5° / 41°F | 2° / 36°F | 106 mm | 3 | 5° / 41°F |
| April | 0 | 8° / 46°F | 6° / 43°F | 97 mm | 5 | 8° / 46°F |
| May | 25 | 12° / 54°F | 10° / 50°F | 86 mm | 6 | 12° / 54°F |
| June | 57 | 17° / 63°F | 15° / 59°F | 84 mm | 7 | 16° / 61°F |
| July | 78 | 21° / 70°F | 19° / 66°F | 72 mm | 7 | 19° / 66°F |
| August | 78 | 22° / 72°F | 20° / 68°F | 74 mm | 6 | 20° / 68°F |
| September | 68 | 19° / 66°F | 17° / 63°F | 95 mm | 5 | 20° / 68°F |
| October | 41 | 15° / 59°F | 13° / 55°F | 114 mm | 3 | 16° / 61°F |
| November | 18 | 11° / 52°F | 8° / 46°F | 106 mm | 2 | 12° / 54°F |
| December | 0 | 7° / 45°F | 3° / 37°F | 114 mm | 1 | 8° / 46°F |
Sea temperature in Nantucket by month
The sea off Nantucket is warmest in August at around 20°C / 68°F, and coolest in February at 4°C / 39°F. It never reaches comfortable swimming temperatures (21°C+). Month-by-month sea-surface temperatures are in the Sea column of the table above.
Nearest destinations
Head-to-head
How Nantucket compares month by month: Nantucket vs Boston · Nantucket vs Providence/Warwick · Nantucket vs Martha's Vineyard · Nantucket vs Hamilton (Bermuda) · all comparisons
Nantucket: questions and answers
What kind of destination is Nantucket?
Nantucket is a seaside town in United States with a oceanic / maritime climate — the sea reaches 20°C at its warmest.
How many hours of sunshine does Nantucket get a year?
Nantucket gets about 2,196 hours of sunshine a year, at its best around July.
When is the best time to visit Nantucket?
The sunniest time to visit Nantucket is July, when the Sunshine Score peaks at 78/100 (with August and September close behind). Expect daytime highs around 21°C / 70°F.
What is the least sunny month in Nantucket?
January is the least sunny month in Nantucket, scoring 0/100 with about 91 mm of rain.
What is the sea temperature in Nantucket?
The sea in Nantucket ranges from about 4°C (February) to 20°C (August). Month-by-month sea temperatures are on this page.
How strong is the sun in Nantucket?
The typical midday UV index in Nantucket 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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