Sumner, WA Weather & Growing Conditions
Today
74°F
Partly Sunny
Partly sunny, with a high near 74. Northwest wind around 2 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 74°F | Partly Sunny | 2 mph NW | 0% |
| Tonight | 51°F | Mostly Clear | 1 mph N | 0% |
| Sunday | 75°F | Mostly Sunny | 2 mph NNW | 0% |
| Sunday Night | 50°F | Mostly Clear | 2 mph N | 0% |
| Monday | 73°F | Mostly Sunny | 2 mph WNW | 0% |
| Monday Night | 51°F | Partly Cloudy | 2 mph NNE | 0% |
| Tuesday | 70°F | Partly Sunny | 2 mph NW | 1% |
| Tuesday Night | 50°F | Mostly Cloudy | 1 mph WSW | 2% |
| Wednesday | 70°F | Partly Sunny | 2 mph W | 13% |
| Wednesday Night | 51°F | Mostly Cloudy | 2 mph NW | 13% |
| Thursday | 67°F | Mostly Cloudy then Slight Chance Light Rain | 0 to 3 mph N | 19% |
| Thursday Night | 49°F | Slight Chance Light Rain | 0 to 3 mph N | 19% |
| Friday | 66°F | Slight Chance Light Rain then Partly Sunny | 0 to 3 mph NW | 15% |
| Friday Night | 47°F | Partly Cloudy | 0 to 3 mph ENE | 13% |
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 Sep 19, 2026.