| National Weather Service Forecast for:
St. Charles County Issued by: NWS National Weather Service Saint Louis, MO |
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| Updated: 127 PM CDT Wed Sep 30 2026 | ||||||||||||||||||
| St. Charles , MO | ||||||||||||||||||
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| This Afternoon |
Partly sunny. Near steady temperature around 90. South winds 5 to 10 mph. |
| Tonight |
Mostly cloudy. Lows in the lower 70s. South winds 5 to 10 mph. |
| Thursday |
Mostly cloudy. A chance of showers with a slight chance of thunderstorms in the afternoon. Highs in the upper 80s. Southwest winds 10 to 15 mph. Chance of rain 50 percent. |
| Thursday Night |
Showers. A chance of thunderstorms, mainly in the evening. Lows in the mid 60s. Northwest winds 5 to 10 mph. Chance of rain 90 percent. |
| Friday |
Mostly cloudy with showers likely in the morning, then mostly sunny in the afternoon. Much cooler with highs in the lower 70s. North winds 10 to 15 mph. Chance of rain 70 percent. |
| Friday Night |
Mostly clear. Lows in the lower 50s. Highs in the lower 70s.. |
| Saturday |
Mostly clear. Lows in the lower 50s. Highs in the lower 70s.. |
| Saturday Night |
Partly cloudy in the evening, then becoming mostly clear. Lows in the lower 50s. |
| Sunday |
Mostly clear. Highs in the mid 70s. |
| Sunday Night |
Mostly clear. Lows in the lower 50s. |
| Monday |
Clear. Highs around 70. |
| Monday Night |
Clear. Lows in the upper 40s. |
| Tuesday |
Sunny. Highs in the lower 70s. |
| Zone Forecast |
St. Charles County |
Forecast from NOAA-NWS for St. Charles County. (Zone forecast)