Sumner, WA Weather & Growing Conditions
This Afternoon
59°F
Partly Sunny
Partly sunny. High near 59, with temperatures falling to around 54 in the afternoon. Northwest wind around 2 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 59°F | Partly Sunny | 2 mph NW | 4% |
| Tonight | 39°F | Partly Cloudy then Patchy Fog | 0 mph | 3% |
| Wednesday | 60°F | Patchy Fog then Slight Chance Light Rain | 1 mph SSW | 19% |
| Wednesday Night | 47°F | Light Rain | 1 to 6 mph S | 92% |
| Thursday | 60°F | Slight Chance Light Rain then Partly Sunny | 2 to 6 mph SSW | 23% |
| Thursday Night | 46°F | Light Rain | 2 mph S | 76% |
| Friday | 59°F | Light Rain | 3 mph S | 76% |
| Friday Night | 46°F | Chance Light Rain | 2 mph SSE | 45% |
| Saturday | 64°F | Chance Light Rain | 1 mph S | 27% |
| Saturday Night | 49°F | Rain | 1 to 10 mph S | 75% |
| Sunday | 59°F | Light Rain | 3 to 12 mph SSW | 75% |
| Sunday Night | 43°F | Slight Chance Light Rain | 3 mph SE | 23% |
| Monday | 59°F | Chance Light Rain | 2 mph SSE | 50% |
| Monday Night | 47°F | Light Rain Likely | 5 mph SSE | 68% |
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 Nov 3, 2026.