| National Weather Service Forecast for:
St. Charles County Issued by: NWS National Weather Service Saint Louis, MO |
||||||||||||||||||
| Updated: 1028 AM CDT Sun Sep 20 2026 | ||||||||||||||||||
| St. Charles , MO | ||||||||||||||||||
|
| Rest Of Today |
Partly sunny. Highs in the lower 90s. West winds 5 to 10 mph. |
| Tonight |
Mostly cloudy with a chance of thunderstorms. A chance of showers in the evening, then showers likely after midnight. Lows in the upper 60s. North winds 5 to 10 mph. Chance of rain 70 percent. |
| Monday |
Mostly cloudy. A chance of showers and thunderstorms in the morning. Much cooler with highs in the mid 70s. North winds 5 to 10 mph. Chance of rain 40 percent. |
| Monday Night |
Mostly cloudy. Lows in the lower 60s. Northeast winds 5 to 10 mph. |
| Tuesday |
Partly sunny. Highs in the lower 70s. Northeast winds 5 to 10 mph. |
| Tuesday Night |
Partly cloudy. Lows in the mid 50s. |
| Wednesday |
Partly cloudy. Highs in the mid 70s. |
| Wednesday Night |
Partly cloudy. Lows in the mid 50s. |
| Thursday |
Partly cloudy. Highs in the mid 70s. |
| Thursday Night |
Partly cloudy. Lows in the mid 50s. |
| Friday |
Partly cloudy. Highs in the mid 70s. |
| Friday Night |
Mostly cloudy. Lows in the upper 50s. |
| Saturday |
Partly sunny. A slight chance of showers in the morning. Highs in the upper 70s. Chance of rain 20 percent. |
| Zone Forecast |
St. Charles County |
Forecast from NOAA-NWS for St. Charles County. (Zone forecast)