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Lake Onalaska Weather Forecast
| TODAY | TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT |
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| Mostly Sunny | Partly Cloudy | Chance of Showers | Partly Cloudy | Rain Showers | Chance of T-Storm | Mostly Cloudy | Partly Cloudy | Chance of Showers | Chance of Showers | Partly Cloudy | Partly Cloudy |
| Hi: 75°FHi: 24°C | Lo: 51°FLo: 11°C | Hi: 69°FHi: 21°C | Lo: 45°FLo: 7°C | Hi: 69°FHi: 21°C | Lo: 60°FLo: 16°C | Hi: 75°FHi: 24°C | Lo: 51°FLo: 11°C | Hi: 70°FHi: 21°C Lo: 55°FLo: 13°C | Hi: 70°FHi: 21°C Lo: 55°FLo: 13°C | Hi: 71°FHi: 22°C Lo: 51°FLo: 11°C | Hi: 71°FHi: 22°C Lo: 51°FLo: 11°C |
| POP: 30% | POP: 100% | POP: 100% | POP: 50% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 317 AM CDT Sat Sep 12 2026 
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Issued: 1248 AM CDT Sat Sep 12 2026
Key Messages
- A line of showers and isolated thunderstorms moves in early this morning with very minimal impacts.
- Widespread rain is likely Monday into Tuesday (70 to 90%) with the potential for localized flooding.
- Cooler, more Fall-like, temperatures are forecast over the next week for the Upper Midwest.
Discussion
... Issued at 1247 AM CDT Sat Sep 12 2026
Tonight through Sunday: Rain Chances and Trending Cooler
A line of showers and thunderstorms has formed and is continuing to move east across sout...