Seattle weather by month

Check out Seattle weather averages by month. Compare detailed monthly climate statistics including temperature, rainfall and sunshine figures.

Temperature in Seattle (°F)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
45°F maximum daytime temperature in January in Seattle45
50°F maximum daytime temperature in February in Seattle50
54°F maximum daytime temperature in March in Seattle54
57°F maximum daytime temperature in April in Seattle57
64°F maximum daytime temperature in May in Seattle64
70°F maximum daytime temperature in June in Seattle70
75°F maximum daytime temperature in July in Seattle75
75°F maximum daytime temperature in August in Seattle75
70°F maximum daytime temperature in September in Seattle70
61°F maximum daytime temperature in October in Seattle61
52°F maximum daytime temperature in November in Seattle52
46°F maximum daytime temperature in December in Seattle46
Min temperature (night-time)
36°F minimum night-time temperature in January in Seattle36
37°F minimum night-time temperature in February in Seattle37
37°F minimum night-time temperature in March in Seattle37
41°F minimum night-time temperature in April in Seattle41
46°F minimum night-time temperature in May in Seattle46
52°F minimum night-time temperature in June in Seattle52
55°F minimum night-time temperature in July in Seattle55
55°F minimum night-time temperature in August in Seattle55
52°F minimum night-time temperature in September in Seattle52
46°F minimum night-time temperature in October in Seattle46
39°F minimum night-time temperature in November in Seattle39
36°F minimum night-time temperature in December in Seattle36
Heat & Humidity
No heat & humidity in January in Seattle0
No heat & humidity in February in Seattle0
No heat & humidity in March in Seattle0
No heat & humidity in April in Seattle0
No heat & humidity in May in Seattle0
No heat & humidity in June in Seattle0
No heat & humidity in July in Seattle0
No heat & humidity in August in Seattle0
No heat & humidity in September in Seattle0
No heat & humidity in October in Seattle0
No heat & humidity in November in Seattle0
No heat & humidity in December in Seattle0

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

Sunshine & Daylight in Seattle

  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 Seattle9
10 hours of daylight per day in February in Seattle10
12 hours of daylight per day in March in Seattle12
14 hours of daylight per day in April in Seattle14
15 hours of daylight per day in May in Seattle15
16 hours of daylight per day in June in Seattle16
16 hours of daylight per day in July in Seattle16
14 hours of daylight per day in August in Seattle14
13 hours of daylight per day in September in Seattle13
11 hours of daylight per day in October in Seattle11
9 hours of daylight per day in November in Seattle9
8 hours of daylight per day in December in Seattle8
UV Index (Maximum)
UV (maximum) index 1 (Low) in January in Seattle1
UV (maximum) index 2 (Low) in February in Seattle2
UV (maximum) index 3 (Moderate) in March in Seattle3
UV (maximum) index 5 (Moderate) in April in Seattle5
UV (maximum) index 6 (High) in May in Seattle6
UV (maximum) index 7 (High) in June in Seattle7
UV (maximum) index 7 (High) in July in Seattle7
UV (maximum) index 6 (High) in August in Seattle6
UV (maximum) index 5 (Moderate) in September in Seattle5
UV (maximum) index 3 (Moderate) in October in Seattle3
UV (maximum) index 1 (Low) in November in Seattle1
UV (maximum) index 1 (Low) in December in Seattle1

Rainfall in Seattle

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Number of days with some rain
18 days with some rainfall in January in Seattle18
15 days with some rainfall in February in Seattle15
16 days with some rainfall in March in Seattle16
13 days with some rainfall in April in Seattle13
11 days with some rainfall in May in Seattle11
9 days with some rainfall in June in Seattle9
5 days with some rainfall in July in Seattle5
6 days with some rainfall in August in Seattle6
9 days with some rainfall in September in Seattle9
12 days with some rainfall in October in Seattle12
17 days with some rainfall in November in Seattle17
18 days with some rainfall in December in Seattle18
Average monthly rainfall (inches)
5.9 inches monthly rainfall in January in Seattle5.9
4.1 inches monthly rainfall in February in Seattle4.1
3.7 inches monthly rainfall in March in Seattle3.7
2.6 inches monthly rainfall in April in Seattle2.6
1.8 inches monthly rainfall in May in Seattle1.8
1.6 inches monthly rainfall in June in Seattle1.6
0.8 inches monthly rainfall in July in Seattle0.8
1.2 inches monthly rainfall in August in Seattle1.2
1.9 inches monthly rainfall in September in Seattle1.9
3.4 inches monthly rainfall in October in Seattle3.4
5.9 inches monthly rainfall in November in Seattle5.9
5.9 inches monthly rainfall in December in Seattle5.9

More about Seattle

Seattle by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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The climate guide for Washington State (Seattle) 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.

What's the climate like in Seattle?

Seattle has a temperate climate with warm dry summers.

Metric (°C)  |  Imperial (°F)

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More about the USA

Compare Seattle with the USA

Below the Seattle chart shows average maximum daytime temperature for Seattle, Washington, USA and the USA (Washington).

Maximum daytime temperature (°F)

Seattle, Washington, USA
USA (Washington)
45
41
50
45
54
55
57
66
64
75
70
84
75
88
75
86
70
79
61
68
52
57
46
46
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Metric (°C)  |  Imperial (°F)

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