Onalaska, WA Weather & Growing Conditions
Overnight
48°F
Mostly Cloudy
Mostly cloudy, with a low around 48. Wind around 0 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 48°F | Mostly Cloudy | 0 mph | 0% |
| Saturday | 75°F | Partly Sunny | 2 mph NW | 0% |
| Saturday Night | 48°F | Mostly Clear | 0 mph | 0% |
| Sunday | 77°F | Mostly Sunny | 2 mph NW | 0% |
| Sunday Night | 48°F | Mostly Clear | 2 mph NNW | 0% |
| Monday | 73°F | Partly Sunny | 0 to 3 mph NW | 0% |
| Monday Night | 48°F | Partly Cloudy | 0 to 3 mph NNW | 0% |
| Tuesday | 70°F | Partly Sunny | 0 to 3 mph NW | 0% |
| Tuesday Night | 45°F | Partly Cloudy | 0 to 3 mph NNW | 2% |
| Wednesday | 68°F | Partly Sunny | 1 mph NW | 2% |
| Wednesday Night | 47°F | Mostly Cloudy | 1 mph NNW | 1% |
| Thursday | 67°F | Mostly Cloudy then Slight Chance Light Rain | 0 to 3 mph N | 15% |
| Thursday Night | 46°F | Slight Chance Light Rain then Mostly Cloudy | 0 to 3 mph N | 15% |
| Friday | 65°F | Partly Sunny | 0 to 3 mph NNW | 12% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Onalaska, WA
Last spring frost
Apr 7
First fall frost
Nov 13
Growing season
215 days
Hardiness zone
8b
Explore more for Onalaska, WA: full frost dates · planting calendar · Washington frost dates
Climate data from the nearest NOAA station, Mayfield Pwr Plt, Wa (2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.