Annual mean 11°C · wettest around February · prevailing wind SW
Warmest
21.0 °C
Coldest
5.0 °C
Wettest
28%
Windiest
7.4 m/s
Prevailing
SW
6.0 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
never good
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 Boston over the whole year is 11°C. July is the hottest month, with highs of about 20°C; January is the coldest, with lows of about 4°C. Boston has no sharply defined rainy season: the chance of rain on a given day runs from 15% in April, the driest month, to 22% in February, the wettest. Winds in Boston are highest in February, averaging 5.9 m/s (21 km/h), and lightest in July, at 4.4 m/s (16 km/h). The prevailing wind is from the SW. The clearest skies in Boston come in April, when the sky is typically 58% covered; December is the cloudiest month, at 70%.
Month by month Boston 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
6°C
4°C
0°C
17%
66%
5.5 m/s
0
0
5
February
8°C
4°C
1°C
22%
66%
5.9 m/s
0
0
14
March
10°C
5°C
4°C
19%
66%
5.5 m/s
1
0
27
April
12°C
6°C
6°C
15%
58%
5.1 m/s
6
0
45
May
15°C
10°C
11°C
19%
60%
4.8 m/s
25
0
73
June
19°C
13°C
15°C
20%
62%
4.7 m/s
50
4
77
July
20°C
15°C
18°C
17%
63%
4.4 m/s
70
8
77
August
20°C
14°C
17°C
16%
61%
4.7 m/s
69
6
78
September
18°C
12°C
15°C
18%
60%
4.6 m/s
48
3
78
October
14°C
10°C
10°C
19%
65%
5.0 m/s
10
0
68
November
9°C
6°C
5°C
19%
66%
5.1 m/s
0
0
33
December
7°C
5°C
2°C
22%
70%
5.4 m/s
0
0
13
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 Boston weather by season
Year round, Boston has days of about 6°C at their warmest in January, its coolest month, and 20°C in July, its warmest; the coolest hours of the day run from 4°C to 15°C through the year, and the average temperature over the year is 11°C around the clock. Rain is most likely around February and least likely around April. 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.
Boston weather in winterDecember to February
High 7°CLow 4°CRain 20%
Winter in Boston has typical daily highs of about 7°C and lows of about 4°C, with a 20% chance of rain on a given day.
Boston weather in springMarch to May
High 12°CLow 7°CRain 17%
Spring in Boston has typical daily highs of about 12°C and lows of about 7°C, with a 17% chance of rain on a given day.
Boston weather in summerJune to August
High 20°CLow 14°CRain 18%
Summer in Boston has typical daily highs of about 20°C and lows of about 14°C, with a 18% chance of rain on a given day.
Boston weather in autumnSeptember to November
High 14°CLow 9°CRain 19%
Autumn in Boston has typical daily highs of about 14°C and lows of about 9°C, with a 19% chance of rain on a given day.
When is the rainy season in Boston?
Boston has no sharply defined rainy season: the chance of rain on a given day runs from 15% in April, the driest month, to 22% in February, the wettest.
What time of year is Boston windiest?
Winds in Boston are highest in February, averaging 5.9 m/s (21 km/h), and lightest in July, at 4.4 m/s (16 km/h). The prevailing wind is from the SW.
What is the average temperature in Boston year round?
The average temperature in Boston over the whole year is 11°C. July is the hottest month, with highs of about 20°C; January is the coldest, with lows of about 4°C.