Temperature
Pleasant by day, mild at night.
70°Ftypical August high
Typical range
August climate
August in Nantucket
United States · Northeast US
Warm coastal days and plenty of sun.
One of the best months here
Late
Daytime high
70°F
Lows around 67°F
Rain
Several rainy days
Sun
11 h/day
Air feel
Humid
Sea temp
68°F
Cool water for swimming
When to visit
Month-by-month fit
Best
Precipitation
Several rainy days, with mixed-length spells. About 9 wet days, fewer than in most months.
29%wet-day frequency
AmountWet-day chance
Sunshine
Plenty of sun this month.
11.2 hAugust sunshine
Heat & humidity by month
Humidity is noticeable this month.
56%August Heat feel
Easy airHumid air
Hourly temperature pattern
In August, afternoons feel about 67° and nights feel near 66°.
FreezingVery coldColdCoolComfortableNight hours
Clear sky
Partly cloudy skies this month.
48%August Clear sky
Clear skyCloud
Wind pattern
August's typical breeze keeps the air from feeling as stagnant.
12 mphAugust Breezy
Sea temperature
68°FAugust sea temp
More detailIncludes daypart comfort
Typical August day
August stays around 69°F through the day and night.
Avg temp Typical range
Morning68°F
Rain13%
Cloud53%
Humid airModerate
Sun intensityModerate
Midday68°F
Rain11%
Cloud52%
Humid airModerate
Sun intensityStrong
Late afternoon69°F
Rain11%
Cloud48%
Humid airModerate
Sun intensityModerate
Early evening69°F
Rain9%
Cloud49%
Humid airModerate
Sun intensityMinimal
Best windowData tableView month-by-month numbers
View month-by-month numbers
| Month | High°F | Low°F | Rainin | Wet days | Sunh | Humidity% | Sea°F |
|---|---|---|---|---|---|---|---|
| Jan | 40 | 33 | 4.6 | 13 | 5.9 | 73 | 42 |
| Feb | 40 | 33 | 4.1 | 11 | 7.0 | 74 | 40 |
| Mar | 42 | 36 | 4.5 | 11 | 8.1 | 76 | 39 |
| Apr | 47 | 43 | 4.1 | 11 | 9.4 | 81 | 43 |
| May | 53 | 50 | 3.7 | 10 | 10.3 | 87 | 49 |
| Jun | 61 | 58 | 3.1 | 8 | 11.5 | 90 | 58 |
| Jul | 69 | 66 | 3.0 | 8 | 11.9 | 90 | 66 |
| Aug | 70 | 67 | 3.5 | 9 | 11.2 | 88 | 68 |
| Sep | 66 | 63 | 4.1 | 8 | 9.6 | 83 | 65 |
| Oct | 60 | 55 | 5.2 | 10 | 8.1 | 77 | 59 |
| Nov | 52 | 46 | 4.0 | 9 | 6.3 | 73 | 53 |
| Dec | 46 | 39 | 4.9 | 12 | 5.5 | 73 | 47 |
Similar climates
Similar
Similar travel styleMartha's VineyardUnited StatesSimilar travel styleCape MayUnited StatesSimilar travel styleEast HamptonUnited StatesSimilar travel styleFire IslandUnited States
Want a side-by-side climate view? Compare Nantucket with Martha's Vineyard.
Climate data notePlanning guidance, not a forecast
Typical monthly values are based on long-term climate records. Useful for planning, not a forecast. Check the weather before you travel.
Sunshine: source type is not yet identified at metric level.
Local microclimates can vary by beach, neighborhood, trail, or elevation.
Last updated: Jul 31, 2026
Data & methodology