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St Charles County Weather Forecast
| REST OF TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY |
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| Clear | Sunny | Partly Cloudy | Mostly Cloudy | Mostly Cloudy | Chance of Showers | Chance of T-Storm | Showers | Chance of Showers | Chance of Showers | Chance of Showers | Partly Sunny |
| Lo: 51°FLo: 11°C | Hi: 85°FHi: 29°C | Lo: 65°FLo: 18°C | Hi: 89°FHi: 32°C | Lo: 70°FLo: 21°C | Hi: 89°FHi: 32°C | Lo: 65°FLo: 18°C | Hi: 75°FHi: 24°C | Hi: 70°FHi: 21°C Lo: 59°FLo: 15°C | Hi: 70°FHi: 21°C Lo: 59°FLo: 15°C | Lo: 59°FLo: 15°C | Hi: 71°FHi: 22°C |
| POP: 50% | POP: 70% | POP: 70% | POP: 50% | POP: 50% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 127 AM CDT Tue Sep 29 2026 
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Issued: 619 AM CDT Tue Sep 29 2026
Key Messages
- Temperatures will remain above normal today through Thursday.
- Widespread 1-3 inches of rain is expected as a slow moving cold front drifts through the area Wednesday night through Friday. The higher end of this range of rainfall is expected across northeast Missouri and west central Illinois.
Aviation
/12Z TAFS THROUGH 18Z WEDNESDAY/... Issued at 617 AM CDT Tue Sep 29 2026
VFR flight conditions and light southerly flow is expected to prevail through the period. A few showers and possibl...