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City of Onalaska, WIOnalaska, WI Weather Forecast
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Onalaska Weather Forecast
| TODAY | TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT |
 |  |  | | |  | | | |  | | |
| Mostly Sunny | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Mostly Sunny | Mostly Clear | Clear | Clear | Mostly Sunny | Chance of Showers | Mostly Sunny | Chance of T-Storm |
| Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 81°FHi: 27°C | Lo: 65°FLo: 18°C | Hi: 80°FHi: 27°C | Lo: 51°FLo: 11°C | Hi: 79°FHi: 26°C Lo: 59°FLo: 15°C | Hi: 79°FHi: 26°C Lo: 59°FLo: 15°C | Hi: 81°FHi: 27°C | Lo: 60°FLo: 16°C | Hi: 79°FHi: 26°C | Lo: 55°FLo: 13°C |
| POP: 40% | POP: 90% | POP: 80% | POP: 40% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 331 AM CDT Mon Sep 07 2026 
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Issued: 307 AM CDT Mon Sep 7 2026
Key Messages
- Increasing rain chances overnight into Tuesday morning, increasing in probabilities and coverage Tuesday evening and night.
- Heavy rain main concern through Tuesday evening and night with strongest storms capable of hail and damaging winds.
- Near normal temperatures and mostly dry rest of the week into the weekend.
Discussion
... Issued at 254 AM CDT Mon Sep 7 2026
Increasing Rain Chances Tonight:
An upper wave currently over the Pacific Northwest is expected to eject into the Canadian Hig...