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St. Charles Weather Forecast
| THIS AFTERNOON | TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | SATURDAY | SATURDAY NIGHT | SUNDAY |
 |  |  |  | | |  |  | | | | |
| Showers | Chance of Showers | Mostly Sunny | Partly Cloudy | Mostly Sunny | Partly Cloudy | Mostly Cloudy | Mostly Cloudy | Mostly Cloudy | Mostly Cloudy | Chance of Showers | Mostly Cloudy |
| Hi: 59°FHi: 15°C | Lo: 45°FLo: 7°C | Hi: 60°FHi: 16°C | Lo: 41°FLo: 5°C | Hi: 61°FHi: 16°C | Lo: 49°FLo: 9°C | Hi: 61°FHi: 16°C Lo: 49°FLo: 9°C | Hi: 61°FHi: 16°C Lo: 49°FLo: 9°C | Hi: 65°FHi: 18°C Lo: 51°FLo: 11°C | Hi: 65°FHi: 18°C Lo: 51°FLo: 11°C | Lo: 51°FLo: 11°C | Hi: 69°FHi: 21°C |
| POP: 70% | POP: 40% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1222 PM CDT Mon Sep 21 2026 
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Issued: 1204 PM CDT Mon Sep 21 2026
Key Messages
- Periods of light rain today southwest of I-94, focused mainly south of I-90. Overall impacts should be limited with rainfall amounts generally of 1/2" or less.
- Cool and dry for much of the upcoming week with near to slightly below normal temperatures.
- Next chance of widespread rain arrives over the weekend, but details of rainfall amounts and placement remain sparse.
Discussion
... Issued at 1200 PM CDT Mon Sep 21 2026
Today - Tonight: Periods of Light Rain
A stacked mid to upper troposp...