Sumner, WA Weather & Growing Conditions
Overnight
55°F
Mostly Clear
Mostly clear, with a low around 55. East northeast wind around 1 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 55°F | Mostly Clear | 1 mph ENE | 0% |
| Tuesday | 88°F | Areas Of Smoke | 1 to 6 mph N | 0% |
| Tuesday Night | 60°F | Areas Of Smoke | 0 to 6 mph NNE | 0% |
| Wednesday | 93°F | Areas Of Smoke | 0 to 5 mph N | 0% |
| Wednesday Night | 61°F | Mostly Clear | 0 to 5 mph N | 0% |
| Thursday | 92°F | Sunny | 0 to 3 mph WSW | 0% |
| Thursday Night | 61°F | Mostly Clear | 3 mph WSW | 0% |
| Friday | 89°F | Sunny | 3 mph WSW | 0% |
| Friday Night | 60°F | Mostly Clear | 0 to 3 mph WSW | 0% |
| Saturday | 85°F | Sunny | 0 to 3 mph WSW | 0% |
| Saturday Night | 58°F | Mostly Clear | 1 to 5 mph WSW | 0% |
| Sunday | 80°F | Mostly Sunny | 3 mph W | 0% |
| Sunday Night | 56°F | Mostly Clear | 3 mph W | 0% |
| Monday | 80°F | Mostly Sunny | 3 mph WNW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Sumner, WA
Last spring frost
Apr 11
First fall frost
Oct 30
Growing season
202 days
Hardiness zone
8b
Explore more for Sumner, WA: full frost dates · planting calendar · Washington frost dates
Climate data from the nearest NOAA station, Mcmillin Rsvr, Wa (5.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.