Boston climate guide

Temperature in Boston (°C)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
1°C maximum daytime temperature in January in Boston1
3°C maximum daytime temperature in February in Boston3
8°C maximum daytime temperature in March in Boston8
14°C maximum daytime temperature in April in Boston14
20°C maximum daytime temperature in May in Boston20
25°C maximum daytime temperature in June in Boston25
28°C maximum daytime temperature in July in Boston28
27°C maximum daytime temperature in August in Boston27
23°C maximum daytime temperature in September in Boston23
17°C maximum daytime temperature in October in Boston17
11°C maximum daytime temperature in November in Boston11
4°C maximum daytime temperature in December in Boston4
Min temperature (night-time)
-8°C minimum night-time temperature in January in Boston-8
-7°C minimum night-time temperature in February in Boston-7
-2°C minimum night-time temperature in March in Boston-2
3°C minimum night-time temperature in April in Boston3
9°C minimum night-time temperature in May in Boston9
14°C minimum night-time temperature in June in Boston14
17°C minimum night-time temperature in July in Boston17
16°C minimum night-time temperature in August in Boston16
12°C minimum night-time temperature in September in Boston12
6°C minimum night-time temperature in October in Boston6
2°C minimum night-time temperature in November in Boston2
-5°C minimum night-time temperature in December in Boston-5
Sea temperature
4°C sea temperature in January in Boston4
3°C sea temperature in February in Boston3
3°C sea temperature in March in Boston3
5°C sea temperature in April in Boston5
9°C sea temperature in May in Boston9
14°C sea temperature in June in Boston14
18°C sea temperature in July in Boston18
18°C sea temperature in August in Boston18
16°C sea temperature in September in Boston16
13°C sea temperature in October in Boston13
9°C sea temperature in November in Boston9
7°C sea temperature in December in Boston7

Sunshine & Daylight in Boston

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daily hours of sunshine
Daily hours of daylight
9 hours of daylight per day in January in Boston9
11 hours of daylight per day in February in Boston11
12 hours of daylight per day in March in Boston12
13 hours of daylight per day in April in Boston13
15 hours of daylight per day in May in Boston15
15 hours of daylight per day in June in Boston15
15 hours of daylight per day in July in Boston15
14 hours of daylight per day in August in Boston14
12 hours of daylight per day in September in Boston12
11 hours of daylight per day in October in Boston11
10 hours of daylight per day in November in Boston10
9 hours of daylight per day in December in Boston9

Rainfall in Boston

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Number of days with some rain
11 days with some rainfall in January in Boston11
10 days with some rainfall in February in Boston10
11 days with some rainfall in March in Boston11
11 days with some rainfall in April in Boston11
11 days with some rainfall in May in Boston11
11 days with some rainfall in June in Boston11
9 days with some rainfall in July in Boston9
10 days with some rainfall in August in Boston10
8 days with some rainfall in September in Boston8
9 days with some rainfall in October in Boston9
11 days with some rainfall in November in Boston11
12 days with some rainfall in December in Boston12
Average monthly rainfall (mm)
93 mm monthly rainfall in January in Boston93
93 mm monthly rainfall in February in Boston93
97 mm monthly rainfall in March in Boston97
93 mm monthly rainfall in April in Boston93
85 mm monthly rainfall in May in Boston85
80 mm monthly rainfall in June in Boston80
75 mm monthly rainfall in July in Boston75
85 mm monthly rainfall in August in Boston85
82 mm monthly rainfall in September in Boston82
87 mm monthly rainfall in October in Boston87
111 mm monthly rainfall in November in Boston111
105 mm monthly rainfall in December in Boston105

More climate for Boston

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (Maximum)
UV (maximum) index 1 (Low) in January in Boston1
UV (maximum) index 2 (Low) in February in Boston2
UV (maximum) index 4 (Moderate) in March in Boston4
UV (maximum) index 5 (Moderate) in April in Boston5
UV (maximum) index 7 (High) in May in Boston7
UV (maximum) index 8 (Very High) in June in Boston8
UV (maximum) index 8 (Very High) in July in Boston8
UV (maximum) index 8 (Very High) in August in Boston8
UV (maximum) index 6 (High) in September in Boston6
UV (maximum) index 4 (Moderate) in October in Boston4
UV (maximum) index 2 (Low) in November in Boston2
UV (maximum) index 1 (Low) in December in Boston1
Heat & Humidity
No heat & humidity in January in Boston0
No heat & humidity in February in Boston0
No heat & humidity in March in Boston0
No heat & humidity in April in Boston0
No heat & humidity in May in Boston0
Low heat & humidity in June in BostonL
Moderate heat & humidity in July in BostonM
Low heat & humidity in August in BostonL
No heat & humidity in September in Boston0
No heat & humidity in October in Boston0
No heat & humidity in November in Boston0
No heat & humidity in December in Boston0

Note: 0 = None, L = Low, M = Moderate, H = High, VH = Very high, E = Extreme

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More about Boston

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The climate guide for Boston, Massachusetts shows long term monthly weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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