King County · Washington
Seattle, WA weather averages
NOAA climate normals for 1991-2020, measured at Seattle Urban Site, 4.9 km from the city centre — month by month temperature, rain and snow.
Quick answer
Seattle averages a daily high of 61.3°F and a daily low of 45.8°F across the year, with 37.72 inches of precipitation. August is the warmest month at 76.2°F and December the coldest at 36°F.
- Average annual high
- 61.3°FWarmest month August
- Average annual low
- 45.8°FColdest month December
- Precipitation per year
- 37.72 inWettest month December
- Snowfall per year
- 5 in23.1 days at or below 32°F
Seattle weather month by month
Normal daily high and low, precipitation and snowfall for each month, 1991-2020.
| Month | High °F | Low °F | Precip in | Snow in | Range |
|---|---|---|---|---|---|
| January | 48.6 | 37.3 | 5.47 | 0.9 | 37.3 to 48.6 degrees |
| February | 51.4 | 37.1 | 3.52 | 0.9 | 37.1 to 51.4 degrees |
| March | 55.4 | 39.7 | 3.85 | 0 | 39.7 to 55.4 degrees |
| April | 59.9 | 42.9 | 2.79 | 0 | 42.9 to 59.9 degrees |
| May | 65.8 | 48.8 | 2.01 | 0 | 48.8 to 65.8 degrees |
| June | 70.7 | 53.3 | 1.57 | 0 | 53.3 to 70.7 degrees |
| July | 75.8 | 56.5 | 0.85 | 0 | 56.5 to 75.8 degrees |
| August | 76.2 | 57 | 0.94 | 0 | 57 to 76.2 degrees |
| September | 70.8 | 53.1 | 1.3 | 0 | 53.1 to 70.8 degrees |
| October | 60.7 | 46.8 | 3.38 | 0 | 46.8 to 60.7 degrees |
| November | 52.4 | 40.6 | 5.98 | 0.7 | 40.6 to 52.4 degrees |
| December | 46.9 | 36 | 6.06 | 2.5 | 36 to 46.9 degrees |
Source: NOAA NCEI, U.S. Climate Normals 1991-2020 — station USW00024281, Seattle Urban Site · rates as published for 1991-2020 normals
How to read Seattle climate normals
What a climate normal is, and what it is not.
A normal is the average of thirty years of daily observations at one station — here Seattle Urban Site, 4.9 km from the centre of Seattle. It describes a typical year, so any single year will run warmer, cooler, wetter or drier. Readings taken at an airport on the edge of town usually sit a degree or two below a dense downtown on summer nights. Seattle sees about 1.6 days a year at or above 90°F and about 92 days with a tenth of an inch of precipitation or more.
Keep going
Other Seattle data on this site.