Alta, IL Weather Forecast
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Alta Weather Forecast
| THIS AFTERNOON | TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT |
| Chance of T-Storm | Chance of T-Storm | Mostly Cloudy | Mostly Clear | Sunny | Mostly Clear | Chance of Showers | Partly Cloudy | Chance of Showers | Chance of Showers | Chance of Showers | Chance of T-Storm |
| Hi: 75°FHi: 24°C | Lo: 69°FLo: 21°C | Hi: 80°FHi: 27°C | Lo: 59°FLo: 15°C | Hi: 85°FHi: 29°C | Lo: 65°FLo: 18°C | Hi: 85°FHi: 29°C | Lo: 65°FLo: 18°C | Hi: 85°FHi: 29°C | Hi: 91°FHi: 33°C Lo: 69°FLo: 21°C | Hi: 91°FHi: 33°C Lo: 69°FLo: 21°C | Lo: 69°FLo: 21°C |
| POP: 90% | POP: 20% | POP: 40% | POP: 30% | POP: 30% | POP: 30% | POP: 60% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1132 AM CDT Wed Sep 09 2026 

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Issued: 1222 PM CDT Wed Sep 9 2026
Key Messages
- Isolated strong to severe thunderstorms south of Interstate 70 this afternoon carry a risk of localized damaging wind gusts.
- Localized heavy rainfall tonight will yield pockets of 1 to 2 inch totals near and south of I-70, leading to potential ponding in low-lying areas.
Discussion
... Issued at 1222 PM CDT Wed Sep 9 2026
Regional radar mosaic indicates a band of showers along a confluence zone dissipating as it tracks east near I-55 early this afternoon. An outflow boundary well ahead ...
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