Onalaska, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Onalaska, a community in Lewis County, Washington.
Overnight
53°F
Patchy Smoke
Patchy smoke. Clear, with a low around 53. North northeast wind around 3 mph.
7-day forecast for Onalaska
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 53°F | Patchy Smoke | 3 mph NNE | 0% |
| Tuesday | 90°F | Areas Of Smoke | 1 to 6 mph N | 0% |
| Tuesday Night | 57°F | Smoke | 1 to 5 mph N | 0% |
| Wednesday | 94°F | Areas Of Smoke | 1 to 5 mph NNW | 0% |
| Wednesday Night | 58°F | Mostly Clear | 0 to 3 mph N | 0% |
| Thursday | 94°F | Sunny | 0 to 3 mph NW | 0% |
| Thursday Night | 56°F | Mostly Clear | 0 to 3 mph NW | 0% |
| Friday | 88°F | Sunny | 0 to 6 mph NW | 0% |
| Friday Night | 53°F | Mostly Clear | 0 to 6 mph NW | 0% |
| Saturday | 82°F | Sunny | 0 to 7 mph NW | 0% |
| Saturday Night | 51°F | Partly Cloudy | 0 to 7 mph W | 0% |
| Sunday | 77°F | Mostly Sunny | 0 to 6 mph WNW | 0% |
| Sunday Night | 50°F | Partly Cloudy | 0 to 6 mph NW | 0% |
| Monday | 77°F | Mostly Sunny | 0 to 5 mph NNW | 0% |
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 Aug 4, 2026.