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Onalaska, WI Weather
Current conditions
Observed at La Crosse - La Crosse Regional Airport · 1 hr ago
Forecast
10-day-
Today
Patchy fog before 11am. Sunny. High near 69, with temperatures falling to around 67 in the afternoon. Southeast wind 3 to 8 mph.
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Tonight
Mostly clear, with a low around 45. Southeast wind around 7 mph.
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Wednesday
Sunny. High near 71, with temperatures falling to around 69 in the afternoon. South wind 0 to 6 mph.
National Weather Service forecast updated 2 hrs ago.
Hourly
Hourly forecast- Now41°
- 9 AM44°
- 10 AM50°
- 11 AM57°
- 12 PM61°
- 1 PM65°
- 2 PM66°
- 3 PM68°
- 4 PM69°
- 5 PM67°
- 6 PM63°
- 7 PM60°
- 8 PM55°
- 9 PM52°
- 10 PM50°
- 11 PM49°
- Wed12 AM48°
- 1 AM48°
- 2 AM47°
- 3 AM47°
- 4 AM45°
- 5 AM45°
- 6 AM45°
- 7 AM45°
Daily forecast
Details- TodayOct 20Patchy Fog then Sunny45°69°
- WedOct 21Sunny47°71°
- ThuOct 22Sunny50°72°
- FriOct 23Mostly Sunny55°68°
- SatOct 24Partly Sunny11%54°69°
- SunOct 25Partly Sunny16%47°66°
- MonOct 26Slight Chance Rain Showers16%42°59°
- TueOct 27Cloudy38°48°
- WedOct 28Cloudy36°52°
Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.
Radar
Full mapWeather news near Onalaska
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Air quality
Air quality is satisfactory, and air pollution poses little or no risk.
Forecast
- TueGood
- WedGood
- ThuGood
Driftless Area North, WI reporting area · 57 min ago. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.
Sun & moon
Nearby
- La Crosse 9 km
- North La Crosse 4 km
- Winona 37 km
- Sparta 34 km
- Holmen 9 km
- Tomah 59 km
- West Salem 12 km
- La Crescent 8 km
- Viroqua 46 km
- French Island 4 km
- Goodview 42 km
- Black River Falls 55 km
Forecasters' discussion
From the National Weather Service office in ARX, issued 2 hrs ago
Key Messages
- Unseasonably warm into the weekend.
- Dry through Thursday night and then maybe some small rain chances from Friday into the weekend.
- Much uncertainty on temperatures and rain chances early next week.
Discussion
Issued at 1146 PM CDT Mon Oct 19 2026
Today through Thursday night
An anomalous 500 mb ridge will remain in control of the area's weather through Thursday night. This high will provide dry weather and unseasonably warm temperatures. High temperatures will warm from the mid- and upper 60s today and be in the lower and mid-70s on Thursday. Low temperatures will be in the 30s and 40s tonight and Wednesday night and in the 40s and 50s on Thursday night.
Friday and Friday night
A negatively tilted trough will move through Minnesota and western and northern Wisconsin. There is still plenty of uncertainty on whether there will be enough low-level moisture for any rain to move into our area.
With some more cover, high temperatures will be a bit cooler (mainly in the 60s). Low temperatures will be a bit warmer (upper 40s to mid-50s).
Aviation
Issued at 600 AM CDT Tue Oct 20 2026
Valley fog has developed overnight and is currently impacting ONA/PDC/OVS with issues seen on all side of LSE but seemingly not within 5 nautical miles. In any case, still prudent to carry a TEMPO at LSE given how close the issues are to impacting the terminal. Once the fog dissipates around 14-15z, VFR conditions will return. Fog may develop once again Wednesday morning primarily impacting the Wisconsin River valley and OVS while low level winds may be too strong for this to impact LSE once again so have kept it out of the TAF near the end of the period.
Arx Watches
WI...None. MN...None. IA...None.
Forecasts, observations and alerts in the United States come from the National Weather Service (NOAA); radar from NOAA's Multi-Radar Multi-Sensor system; satellite imagery from NASA's Global Imagery Browse Services (GIBS) and NOAA's GOES satellites; the map from the U.S. Geological Survey's National Map; air quality from AirNow (EPA and its partners); hurricane information from the National Hurricane Center; climate normals and records from NOAA's Regional Climate Centers (ACIS). Forecasts outside the United States and the UV index: MET Norway (CC BY 4.0); observations outside the U.S.: airport reports via NOAA's Aviation Weather Center. Place names: GeoNames (CC BY 4.0). Data are copied on a schedule and may lag the sources; for warnings that affect your safety, follow your local National Weather Service office and emergency officials. Weather news is drawn from the 4Search index and reflects what the press published. Terms of use.