Onalaska, WI Weather & Growing Conditions
Today
80°F
Mostly Cloudy then Isolated Rain Showers
Isolated rain showers after 3pm. Mostly cloudy. High near 80, with temperatures falling to around 77 in the afternoon. West wind around 8 mph. Chance of precipitation is 20%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 80°F | Mostly Cloudy then Isolated Rain Showers | 8 mph W | 24% |
| Tonight | 60°F | Scattered Rain Showers | 2 to 6 mph NW | 36% |
| Wednesday | 79°F | Mostly Sunny | 3 mph NW | 2% |
| Wednesday Night | 57°F | Mostly Clear | 0 to 3 mph W | 0% |
| Thursday | 84°F | Sunny | 0 to 5 mph S | 0% |
| Thursday Night | 61°F | Mostly Clear | 5 mph S | 0% |
| Friday | 87°F | Sunny | 3 to 10 mph S | 7% |
| Friday Night | 65°F | Slight Chance Rain Showers | 5 to 9 mph S | 18% |
| Saturday | 87°F | Slight Chance Rain Showers then Mostly Sunny | 5 to 8 mph SW | 15% |
| Saturday Night | 69°F | Slight Chance Showers And Thunderstorms | 8 mph SW | 40% |
| Sunday | 87°F | Chance Showers And Thunderstorms | 5 to 8 mph W | 40% |
| Sunday Night | 67°F | Chance Showers And Thunderstorms | 3 to 7 mph SE | 42% |
| Monday | 86°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 6 mph S | 42% |
| Monday Night | 67°F | Chance Showers And Thunderstorms | 6 mph NE | 30% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Onalaska, WI
Last spring frost
Apr 23
First fall frost
Oct 17
Growing season
177 days
Hardiness zone
5a
Explore more for Onalaska, WI: full frost dates · planting calendar · Wisconsin frost dates
Climate data from the nearest NOAA station, La Crosse Muni Ap, Wi (2.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.