| National Weather Service Forecast for:
St. Charles County Issued by: NWS National Weather Service Saint Louis, MO |
||||||||||||||||||
| Updated: 744 PM CDT Tue Sep 2 2025 | ||||||||||||||||||
| St. Charles , MO | ||||||||||||||||||
|
| Tonight |
Mostly clear. Lows in the upper 50s. North winds around 5 mph, becoming west after midnight. |
| Wednesday |
Sunny. A chance of showers with a slight chance of thunderstorms in the afternoon. Highs in the mid 80s. West winds 5 to 10 mph. Chance of rain 50 percent. |
| Wednesday Night |
Showers likely with a chance of thunderstorms in the evening, then a chance of showers after midnight. Lows in the upper 50s. Northwest winds 5 to 10 mph. Chance of rain 70 percent. |
| Thursday |
Mostly sunny. Highs in the mid 70s. Northwest winds 5 to 10 mph. |
| Thursday Night |
Mostly clear. Lows in the upper 50s. South winds around 5 mph. |
| Friday |
Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the upper 70s. Chance of rain 20 percent. |
| Friday Night |
Mostly cloudy with a chance of showers in the evening, then partly cloudy with a slight chance of showers after midnight. Lows in the lower 50s. Chance of rain 40 percent. |
| Saturday |
Mostly clear. Highs in the upper 70s. |
| Saturday Night |
Mostly clear. Lows in the lower 50s. |
| Sunday |
Mostly clear. Highs in the upper 70s. |
| Sunday Night |
Partly cloudy in the evening, then becoming mostly cloudy. Lows in the mid 50s. |
| Monday |
Partly sunny. Highs in the upper 70s. |
| Monday Night |
Mostly cloudy. A 20 percent chance of showers. Lows in the upper 50s. |
| Tuesday |
Mostly cloudy. A 20 percent chance of showers. Highs in the mid 70s. |
| Zone Forecast |
St. Charles County |
Forecast from NOAA-NWS for St. Charles County. (Zone forecast)