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 (°C)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
7°C maximum daytime temperature in January in Seattle7
10°C maximum daytime temperature in February in Seattle10
12°C maximum daytime temperature in March in Seattle12
14°C maximum daytime temperature in April in Seattle14
18°C maximum daytime temperature in May in Seattle18
21°C maximum daytime temperature in June in Seattle21
24°C maximum daytime temperature in July in Seattle24
24°C maximum daytime temperature in August in Seattle24
21°C maximum daytime temperature in September in Seattle21
16°C maximum daytime temperature in October in Seattle16
11°C maximum daytime temperature in November in Seattle11
8°C maximum daytime temperature in December in Seattle8
Min temperature (night-time)
2°C minimum night-time temperature in January in Seattle2
3°C minimum night-time temperature in February in Seattle3
3°C minimum night-time temperature in March in Seattle3
5°C minimum night-time temperature in April in Seattle5
8°C minimum night-time temperature in May in Seattle8
11°C minimum night-time temperature in June in Seattle11
13°C minimum night-time temperature in July in Seattle13
13°C minimum night-time temperature in August in Seattle13
11°C minimum night-time temperature in September in Seattle11
8°C minimum night-time temperature in October in Seattle8
4°C minimum night-time temperature in November in Seattle4
2°C minimum night-time temperature in December in Seattle2
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 (mm)
149 mm monthly rainfall in January in Seattle149
105 mm monthly rainfall in February in Seattle105
95 mm monthly rainfall in March in Seattle95
66 mm monthly rainfall in April in Seattle66
46 mm monthly rainfall in May in Seattle46
41 mm monthly rainfall in June in Seattle41
20 mm monthly rainfall in July in Seattle20
31 mm monthly rainfall in August in Seattle31
49 mm monthly rainfall in September in Seattle49
87 mm monthly rainfall in October in Seattle87
149 mm monthly rainfall in November in Seattle149
151 mm monthly rainfall in December in Seattle151

More about Seattle

Seattle by month

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

Recommended for Washington State

Auto Europe: Cheap car hire deals worldwide

  • Compare car hire prices to find lowest rate
  • Free cancellation up to 48 hours before pick up
  • Book car hire for over 20,000 destinations worldwide
Go to Auto Europe deal >>

View all Auto Europe offers

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 / mm)  |  Imperial (°F / inches)

Back to top

More about the USA

Compare Seattle with the UK

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

Maximum daytime temperature (°C)

Seattle, Washington, USA
UK (London)
7
7
10
7
12
10
14
13
18
17
21
20
24
22
24
22
21
19
16
15
11
10
8
8
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

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

Compare more Seattle weather >>

Back to top

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^