Sumner, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sumner, a city in Pierce County, Washington.
Overnight
50°F
Mostly Cloudy
Mostly cloudy, with a low around 50. South southwest wind around 1 mph.
7-day forecast for Sumner
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 50°F | Mostly Cloudy | 1 mph SSW | 0% |
| Saturday | 74°F | Partly Sunny | 2 mph WNW | 0% |
| Saturday Night | 51°F | Mostly Clear | 1 mph NNW | 0% |
| Sunday | 75°F | Mostly Sunny | 0 to 3 mph NNW | 0% |
| Sunday Night | 50°F | Mostly Clear | 0 to 3 mph N | 0% |
| Monday | 73°F | Mostly Sunny | 2 mph NW | 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 | 2 mph SW | 3% |
| Wednesday | 70°F | Partly Sunny | 2 mph WSW | 13% |
| Wednesday Night | 51°F | Mostly Cloudy | 2 mph WNW | 13% |
| Thursday | 67°F | Mostly Cloudy then Slight Chance Light Rain | 0 to 5 mph NNE | 19% |
| Thursday Night | 49°F | Slight Chance Light Rain | 0 to 5 mph NNE | 19% |
| Friday | 66°F | Slight Chance Light Rain then Partly Sunny | 0 to 3 mph WNW | 15% |
Forecast source: National Weather Service (api.weather.gov) for Sumner (47.227, -122.236). Updated through the day.
Growing snapshot for Sumner
Last spring frost
Apr 11
First fall frost
Oct 30
Growing season
202 days
Hardiness zone
8b
More local growing data for Sumner: nearby ZIP 98390 weather · frost dates · planting calendar · Washington frost dates
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Home
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Climate data from the nearest NOAA station, Mcmillin Rsvr, Wa (5.4 mi from Sumner). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.