Annual mean 11°C · wettest around November · prevailing wind SW
Warmest
21.7 °C
Coldest
6.0 °C
Wettest
20%
Windiest
3.9 m/s
Prevailing
SW
3.2 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 Seattle over the whole year is 11°C. July is the hottest month, with highs of about 23°C; February is the coldest, with lows of about 4°C. The rainy (wet) season in Seattle runs from October to April, peaking in November with a 24% chance of rain on a given day. The dry season is May to September; July is the driest month, at 4%. Winds in Seattle are highest in February, averaging 3.0 m/s (11 km/h), and lightest in August, at 2.4 m/s (9 km/h). The prevailing wind is from the SW. The clearest skies in Seattle come in July, when the sky is typically 37% covered; December is the cloudiest month, at 75%.
Month by month Seattle 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
7°C
4°C
3°C
23%
73%
2.7 m/s
0
0
24
February
7°C
4°C
3°C
20%
75%
3.0 m/s
0
0
22
March
10°C
5°C
6°C
19%
67%
3.0 m/s
3
0
41
April
12°C
7°C
9°C
16%
60%
3.0 m/s
10
0
65
May
16°C
11°C
13°C
10%
57%
2.7 m/s
37
2
86
June
19°C
13°C
16°C
9%
54%
2.7 m/s
62
6
86
July
23°C
15°C
20°C
4%
37%
2.5 m/s
88
16
76
August
23°C
15°C
21°C
5%
40%
2.4 m/s
86
21
71
September
18°C
13°C
17°C
10%
53%
2.4 m/s
72
5
86
October
14°C
9°C
11°C
18%
62%
2.6 m/s
22
0
79
November
9°C
7°C
6°C
24%
71%
2.9 m/s
3
0
44
December
7°C
5°C
3°C
23%
75%
2.8 m/s
0
0
22
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 Seattle weather by season
Year round, Seattle has days of about 7°C at their warmest in January, its coolest month, and 23°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 November 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.
Seattle weather in winterDecember to February
High 7°CLow 4°CRain 22%
Winter in Seattle has typical daily highs of about 7°C and lows of about 4°C, with a 22% chance of rain on a given day.
Seattle weather in springMarch to May
High 13°CLow 8°CRain 15%
Spring in Seattle has typical daily highs of about 13°C and lows of about 8°C, with a 15% chance of rain on a given day.
Seattle weather in summerJune to August
High 21°CLow 14°CRain 6%
Summer in Seattle has typical daily highs of about 21°C and lows of about 14°C, with a 6% chance of rain on a given day.
Seattle weather in autumnSeptember to November
High 14°CLow 10°CRain 17%
Autumn in Seattle has typical daily highs of about 14°C and lows of about 10°C, with a 17% chance of rain on a given day.
When is the rainy season in Seattle?
The rainy (wet) season in Seattle runs from October to April, peaking in November with a 24% chance of rain on a given day. The dry season is May to September; July is the driest month, at 4%.
What time of year is Seattle windiest?
Winds in Seattle are highest in February, averaging 3.0 m/s (11 km/h), and lightest in August, at 2.4 m/s (9 km/h). The prevailing wind is from the SW.
What is the average temperature in Seattle year round?
The average temperature in Seattle over the whole year is 11°C. July is the hottest month, with highs of about 23°C; February is the coldest, with lows of about 4°C.