Annual mean 11°C · wettest around December · prevailing wind W
Warmest
25.2 °C
Coldest
2.6 °C
Wettest
14%
Windiest
5.5 m/s
Prevailing
W
4.7 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Nantucket over the whole year is 11°C. July is the hottest month, with highs of about 25°C; January is the coldest, with lows of about 0°C. Nantucket has no sharply defined rainy season: the chance of rain on a given day runs from 5% in July, the driest month, to 12% in December, the wettest. Winds in Nantucket are highest in March, averaging 4.7 m/s (17 km/h), and lightest in July, at 3.1 m/s (11 km/h). The prevailing wind is from the W. The clearest skies in Nantucket come in August, when the sky is typically 40% covered; January is the cloudiest month, at 54%.
Month by month Nantucket climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
3°C
0°C
-3°C
11%
54%
4.3 m/s
0
0
6
February
4°C
1°C
-2°C
12%
51%
4.1 m/s
0
0
9
March
6°C
2°C
0°C
10%
50%
4.7 m/s
0
0
16
April
10°C
7°C
5°C
11%
51%
4.3 m/s
5
0
41
May
15°C
11°C
12°C
10%
50%
3.9 m/s
31
2
76
June
21°C
16°C
20°C
7%
44%
3.4 m/s
78
17
71
July
25°C
20°C
25°C
5%
47%
3.1 m/s
66
52
32
August
25°C
20°C
25°C
7%
40%
3.1 m/s
69
49
35
September
21°C
17°C
20°C
9%
44%
3.4 m/s
75
21
64
October
17°C
13°C
14°C
11%
48%
3.7 m/s
48
3
77
November
11°C
7°C
6°C
9%
45%
4.0 m/s
11
0
44
December
6°C
3°C
0°C
12%
51%
4.0 m/s
1
0
16
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Nantucket weather by season
Year round, Nantucket has days of about 3°C at their warmest in January, its coolest month, and 25°C in July, its warmest; the coolest hours of the day run from 0°C to 20°C through the year, and the average temperature over the year is 11°C around the clock. Rain is most likely around December and least likely around July. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Nantucket weather in winterDecember to February
High 4°CLow 1°CRain 12%
Winter in Nantucket has typical daily highs of about 4°C and lows of about 1°C, with a 12% chance of rain on a given day.
Nantucket weather in springMarch to May
High 11°CLow 7°CRain 10%
Spring in Nantucket has typical daily highs of about 11°C and lows of about 7°C, with a 10% chance of rain on a given day.
Nantucket weather in summerJune to August
High 23°CLow 19°CRain 6%
Summer in Nantucket has typical daily highs of about 23°C and lows of about 19°C, with a 6% chance of rain on a given day.
Nantucket weather in autumnSeptember to November
High 16°CLow 12°CRain 10%
Autumn in Nantucket has typical daily highs of about 16°C and lows of about 12°C, with a 10% chance of rain on a given day.
When is the rainy season in Nantucket?
Nantucket has no sharply defined rainy season: the chance of rain on a given day runs from 5% in July, the driest month, to 12% in December, the wettest.
What time of year is Nantucket windiest?
Winds in Nantucket are highest in March, averaging 4.7 m/s (17 km/h), and lightest in July, at 3.1 m/s (11 km/h). The prevailing wind is from the W.
What is the average temperature in Nantucket year round?
The average temperature in Nantucket over the whole year is 11°C. July is the hottest month, with highs of about 25°C; January is the coldest, with lows of about 0°C.