Sumner, WA Weather & Climate Normals
Sumner's real weather, in one number
Sumner, WA scores 51/100 on this site's reading of NOAA's own 30-year normals: strongly seasonal. Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. 4 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
Sumner's hottest and coldest months
Sumner's hottest month is Aug, averaging 65°F; its coldest is Dec, averaging 39°F, a 25.6°F swing across the year, a middling gap by national standards.
Sumner's weather across the year
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 46°F | 33°F | 6.12in | 1.5in |
| Feb | 48°F | 33°F | 4.33in | 0.5in |
| Mar | 52°F | 36°F | 4.8in | 0.6in |
| Apr | 57°F | 39°F | 3.9in | 0in |
| May | 64°F | 45°F | 2.97in | 0in |
| Jun | 69°F | 49°F | 2.28in | 0in |
| Jul | 76°F | 52°F | 0.92in | 0in |
| Aug | 77°F | 53°F | 0.9in | 0in |
| Sep | 70°F | 48°F | 1.78in | 0in |
| Oct | 59°F | 42°F | 4.08in | 0in |
| Nov | 50°F | 36°F | 7.06in | 1.5in |
| Dec | 45°F | 33°F | 5.99in | 1.5in |
Jun, Jul, Aug, and Sep are the best time to see Sumner at its mildest; the rest of the year, plan around Dec's cold.
Rain and snow in Sumner
Sumner averages 45.13in of precipitation a year across roughly 166 days with measurable rain or snow, and 5.6in of snow a year.
Where Sumner ranks
Sumner ranks 1536 of 4876 US cities in this dataset for comfort score, and 86 of 125 within WA. About 10,885 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from Mcmillin Rsvr, WA US, 6.4 miles from Sumner, not a prediction for any specific day.
More on how this is worked out
What a 30-year climate normal actually is · Why this uses the nearest NOAA station