Temperature
Cold by day, cold at night.
46°Ftypical December high
Typical range
December climate
December in Nantucket
United States · Northeast US
Weather varies through the month. Cold weather and wind on exposed beaches are the main drawbacks.
Some tradeoffs
Daytime high
46°F
Lows around 39°F
Rain
Several rainy days
Sun
5.5 h/day
Air feel
Very dry
Sea temp
47°F
Too cold for swimming
Wind
19 mph
Windy
When to visit
Month-by-month fit
Best
Precipitation
Several rainy days. About 12 wet days, more than in most months.
39%wet-day frequency
AmountWet-day chance
Sunshine
A mix of sunshine and cloud.
5.5 hDecember sunshine
Heat & humidity by month
Humidity is rarely noticeable in the cool air.
Very dryDecember Heat feel
Easy airHumid air
Hourly temperature pattern
In December, afternoons feel about 28° and nights feel near 27°.
FreezingVery coldColdCoolComfortableNight hours
Clear sky
Mostly cloudy skies this month.
32%December Clear sky
Clear skyCloud
Wind pattern
Wind can affect exposed beach comfort.
19 mphDecember Windy
Sea temperature
47°FDecember sea temp
More detailIncludes daypart comfort
Typical December day
December stays around 42°F through the day and night.
Avg temp Typical range
Morning41°F
Rain17%
Cloud68%
Humid airLow
Sun intensityLow
Midday42°F
Rain18%
Cloud69%
Humid airLow
Sun intensityLow
Late afternoon42°F
Rain17%
Cloud70%
Humid airLow
Sun intensityMinimal
Early evening42°F
Rain17%
Cloud67%
Humid airLow
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