Sumner, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sumner, a city in Pierce County, Washington.
Overnight
55°F
Clear
Clear, with a low around 55. Northeast wind around 1 mph.
7-day forecast for Sumner
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 55°F | Clear | 1 mph NE | 0% |
| Tuesday | 88°F | Areas Of Smoke | 1 to 6 mph N | 0% |
| Tuesday Night | 60°F | Areas Of Smoke | 1 to 6 mph NNE | 0% |
| Wednesday | 93°F | Patchy Smoke | 1 to 5 mph N | 0% |
| Wednesday Night | 62°F | Mostly Clear | 0 to 5 mph NE | 0% |
| Thursday | 92°F | Sunny | 0 to 3 mph SW | 0% |
| Thursday Night | 62°F | Mostly Clear | 3 mph WSW | 0% |
| Friday | 89°F | Sunny | 3 mph WSW | 0% |
| Friday Night | 60°F | Mostly Clear | 3 mph WSW | 0% |
| Saturday | 86°F | Sunny | 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 | 57°F | Mostly Clear | 3 mph W | 0% |
| Monday | 80°F | Mostly Sunny | 3 mph WNW | 0% |
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 Aug 4, 2026.