Tumwater, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Tumwater, a city in Thurston County, Washington.
Tonight
47°F
Areas Of Fog
Areas of fog after 11pm. Partly cloudy, with a low around 47. North wind around 1 mph.
7-day forecast for Tumwater
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 47°F | Areas Of Fog | 1 mph N | 0% |
| Sunday | 75°F | Areas Of Fog then Mostly Sunny | 0 to 3 mph NNE | 0% |
| Sunday Night | 45°F | Mostly Clear then Areas Of Fog | 0 to 3 mph N | 0% |
| Monday | 74°F | Areas Of Fog then Mostly Cloudy | 0 to 5 mph NW | 0% |
| Monday Night | 49°F | Partly Cloudy | 0 to 5 mph WSW | 0% |
| Tuesday | 72°F | Partly Sunny | 0 to 8 mph SW | 0% |
| Tuesday Night | 47°F | Partly Cloudy | 2 to 8 mph SW | 4% |
| Wednesday | 69°F | Partly Sunny | 2 to 6 mph WSW | 4% |
| Wednesday Night | 46°F | Mostly Cloudy | 0 to 6 mph NW | 3% |
| Thursday | 66°F | Mostly Cloudy then Slight Chance Light Rain | 0 to 6 mph NNE | 23% |
| Thursday Night | 47°F | Chance Light Rain | 0 to 5 mph N | 46% |
| Friday | 64°F | Chance Light Rain | 0 to 7 mph WSW | 46% |
| Friday Night | 45°F | Slight Chance Light Rain then Partly Cloudy | 2 to 7 mph SW | 18% |
| Saturday | 66°F | Partly Sunny | 2 to 6 mph WSW | 8% |
Forecast source: National Weather Service (api.weather.gov) for Tumwater (46.989, -122.917). Updated through the day.
Growing snapshot for Tumwater
Last spring frost
Apr 29
First fall frost
Oct 14
Growing season
169 days
Hardiness zone
8a
More local growing data for Tumwater: nearby ZIP 98501 weather · frost dates · planting calendar · Washington frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Olympia Ap, Wa (1.3 mi from Tumwater). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.