| National Weather Service Forecast for:
St. Charles County Issued by: NWS National Weather Service Saint Louis, MO |
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| Updated: 818 AM CDT Wed Jul 8 2026 | ||||||||||||||||||
| St. Charles , MO | ||||||||||||||||||
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| Today |
Mostly sunny. Isolated showers and thunderstorms this afternoon. Highs in the upper 80s. Southwest winds around 5 mph. Chance of rain 20 percent. |
| Tonight |
Mostly clear. Isolated showers and thunderstorms in the evening. Lows in the lower 70s. South winds around 5 mph. Chance of rain 20 percent. |
| Thursday |
Partly sunny. Scattered showers and thunderstorms in the afternoon. Highs in the lower 90s. Southwest winds 5 to 10 mph. Chance of rain 50 percent. Heat index values up to 102. |
| Thursday Night |
Showers and thunderstorms. Humid with lows in the lower 70s. South winds 5 to 10 mph, becoming west after midnight. Chance of rain 80 percent. Heat index values up to 100 early in the evening. |
| Friday |
A chance of showers and thunderstorms in the morning, then showers and thunderstorms likely in the afternoon. Humid with highs around 90. West winds around 5 mph. Chance of rain 70 percent. Heat index values up to 101. |
| Friday Night |
Showers and thunderstorms likely. Lows in the lower 70s. Chance of rain 70 percent. |
| Saturday |
Mostly cloudy in the morning, then becoming partly sunny. A chance of showers and thunderstorms. Highs in the upper 80s. Chance of rain 50 percent. |
| Saturday Night |
Partly cloudy with a chance of showers and thunderstorms. Lows in the lower 70s. Chance of rain 50 percent. |
| Sunday |
Mostly sunny. A chance of showers and thunderstorms, mainly in the morning. Highs in the upper 80s. Chance of rain 30 percent. |
| Sunday Night |
Mostly clear. Lows around 70. |
| Monday |
Mostly clear. Highs around 90. |
| Monday Night |
Clear. Lows in the lower 70s. |
| Tuesday |
Sunny. Highs in the lower 90s. Heat index values up to 100. |
| Zone Forecast |
St. Charles County |
Forecast from NOAA-NWS for St. Charles County. (Zone forecast)