This reference page collects seattle climate: monthly averages in one place: annual mean temperature 10.5 C; warmest month Aug (18.3 C); coldest month Dec (3.8 C); wettest month Nov (6.27 mm/day). Figures are refreshed automatically by a scheduled build and cached locally so the page keeps its values even when the upstream API is temporarily unavailable. Use the table below for exact numbers, or the related pages for the same dataset for neighbouring periods and locations.
Annual mean temperature 10.5 C
Warmest month Aug (18.3 C)
Coldest month Dec (3.8 C)
Wettest month Nov (6.27 mm/day)
All-time record high 38.0 C
All-time record low -10.4 C
Annual precipitation 1,230 mm / year
Coordinates 47.6062, -122.3321
Population 755,000
Average monthly temperature and rainfall in Seattle
Month
Mean temp (C)
Rain (mm/day)
Record high (C)
Record low (C)
Jan
4.4
5.60
17.5
-10.4
Feb
4.6
3.83
17.2
-9.7
Mar
6.7
4.46
21.8
-4.0
Apr
9.0
3.18
30.5
-1.9
May
12.8
2.27
32.5
-0.4
Jun
15.2
1.71
33.8
4.6
Jul
18.2
0.62
38.0
7.9
Aug
18.3
0.95
33.0
7.8
Sep
15.4
1.94
32.7
3.8
Oct
10.8
4.03
26.2
-2.3
Nov
6.7
6.27
21.4
-8.8
Dec
3.8
5.65
15.4
-10.4
What the Seattle climate table shows
Values are multi-decadal climatological averages for the 47.6062, -122.3321 grid cell, not a single year. Rain is the daily mean, so a value of 2.00 mm/day is about 60 mm across a 30-day month. Averages smooth over extremes, so use them for planning rather than for what to pack for next Tuesday.
Frequently asked questions
Where does the data on seattle climate: monthly averages come from?
From a public open API that is queried automatically and cached after every successful run.
How often is seattle climate: monthly averages updated?
The build runs on a schedule, so values refresh at least daily and old pages stay live.