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Onalaska High School Weather Forecast
| TODAY | TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT |
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| Chance of Showers | Chance of Showers | Chance of Showers | Partly Cloudy | Mostly Sunny | Partly Cloudy | Partly Cloudy | Partly Cloudy | Mostly Sunny | Clear | Mostly Sunny | Partly Cloudy |
| Hi: 75°FHi: 24°C | Lo: 60°FLo: 16°C | Hi: 69°FHi: 21°C | Lo: 45°FLo: 7°C | Hi: 65°FHi: 18°C | Hi: 65°FHi: 18°C Lo: 41°FLo: 5°C | Hi: 65°FHi: 18°C Lo: 41°FLo: 5°C | Lo: 49°FLo: 9°C | Hi: 61°FHi: 16°C | Lo: 39°FLo: 4°C | Hi: 60°FHi: 16°C | Hi: 61°FHi: 16°C Lo: 41°FLo: 5°C |
| POP: 40% | POP: 50% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 812 AM CDT Wed Sep 30 2026 
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Issued: 607 AM CDT Wed Sep 30 2026
Key Messages
- Heaviest rainfall locally affecting southernmost counties from northeast Iowa into far southwest Wisconsin through Thursday with 1" to 2" expected, heaviest tonight into Thursday morning.
- Diminishing, low (<20%) flooding (river/areal) threat due to southern shift in forecasted heavy rainfall amounts.
Discussion
... Issued at 111 AM CDT Wed Sep 30 2026
Through Thursday: Widespread Rainfall
Widespread light to moderate showers have overspread much of the Upper and Mid Mississippi River Valleys overnight with QPE totals on the low side generally at or below 0.25 inches. This activity...