Onalaska, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Onalaska, a community in Lewis County, Washington.
This Afternoon
59°F
Partly Sunny
Partly sunny. High near 59, with temperatures falling to around 54 in the afternoon. North northwest wind around 1 mph.
7-day forecast for Onalaska
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 59°F | Partly Sunny | 1 mph NNW | 4% |
| Tonight | 38°F | Partly Cloudy | 2 mph ESE | 4% |
| Wednesday | 57°F | Partly Sunny then Chance Light Rain | 3 mph SSE | 45% |
| Wednesday Night | 45°F | Light Rain | 2 to 9 mph S | 99% |
| Thursday | 55°F | Chance Light Rain then Partly Sunny | 1 to 5 mph S | 31% |
| Thursday Night | 44°F | Light Rain | 1 to 7 mph SSE | 76% |
| Friday | 55°F | Light Rain | 2 to 9 mph SSE | 76% |
| Friday Night | 45°F | Chance Light Rain | 5 mph SSE | 41% |
| Saturday | 62°F | Mostly Cloudy then Chance Light Rain | 5 mph SSE | 30% |
| Saturday Night | 47°F | Light Rain Likely | 2 to 15 mph S | 72% |
| Sunday | 55°F | Light Rain Likely | 0 to 9 mph SW | 72% |
| Sunday Night | 42°F | Slight Chance Light Rain | 0 to 3 mph ESE | 24% |
| Monday | 56°F | Chance Light Rain | 5 mph SE | 50% |
| Monday Night | 45°F | Light Rain Likely | 3 to 12 mph SSE | 66% |
Forecast source: National Weather Service (api.weather.gov) for Onalaska (46.578, -122.711). Updated through the day.
Growing snapshot for Onalaska
Last spring frost
Apr 5
First fall frost
Oct 25
Growing season
196 days
Hardiness zone
8a
More local growing data for Onalaska: nearby ZIP 98542 weather · frost dates · planting calendar · Washington frost dates
Nearby towns & communities
Ashford
Centralia
Chehalis
Fords Prairie
Grand Mound
Morton
Mossyrock
Napavine
Packwood
Pe Ell
Toledo
Vader
Winlock
Climate data from the nearest NOAA station, Toledo Faa Ap, Wa (5.5 mi from Onalaska). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.