Onalaska, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Onalaska, a city in La Crosse County, Wisconsin.
Today
80°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms between 8am and 9am, then a chance of showers and thunderstorms between 9am and noon, then a slight chance of showers and thunderstorms between noon and 4pm, then a chance of showers and thunderstorms. Mostly cloudy. High near 80, with temperatures falling to around 77 in the afternoon. Southwest wind 6 to 9 mph, with gusts as high as 18 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Onalaska
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 80°F | Slight Chance Showers And Thunderstorms | 6 to 9 mph SW | 47% |
| Tonight | 60°F | Chance Showers And Thunderstorms | 2 to 7 mph W | 48% |
| Wednesday | 79°F | Mostly Sunny | 5 mph NW | 2% |
| Wednesday Night | 56°F | Mostly Clear | 0 to 3 mph W | 0% |
| Thursday | 84°F | Sunny | 0 to 5 mph SW | 0% |
| Thursday Night | 61°F | Mostly Clear | 5 mph S | 0% |
| Friday | 87°F | Sunny | 2 to 10 mph S | 6% |
| Friday Night | 64°F | Slight Chance Rain Showers | 5 to 9 mph S | 18% |
| Saturday | 88°F | Slight Chance Rain Showers then Mostly Sunny | 3 to 8 mph SW | 15% |
| Saturday Night | 68°F | Slight Chance Showers And Thunderstorms | 5 to 8 mph SW | 40% |
| Sunday | 87°F | Chance Showers And Thunderstorms | 5 to 9 mph W | 40% |
| Sunday Night | 66°F | Chance Showers And Thunderstorms | 2 to 7 mph SE | 42% |
| Monday | 86°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 6 mph S | 42% |
| Monday Night | 66°F | Chance Showers And Thunderstorms | 6 mph NE | 30% |
Forecast source: National Weather Service (api.weather.gov) for Onalaska (43.890, -91.204). Updated through the day.
Growing snapshot for Onalaska
Last spring frost
Apr 23
First fall frost
Oct 17
Growing season
177 days
Hardiness zone
5a
More local growing data for Onalaska: nearby ZIP 54650 weather · frost dates · planting calendar · Wisconsin frost dates
Nearby towns & communities
Bangor
Brice Prairie
Coon Valley
French Island
Holmen
La Crosse
Mindoro
Rockland
St. Joseph
West Salem
Climate data from the nearest NOAA station, La Crosse Muni Ap, Wi (2.5 mi from Onalaska). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.