| National Weather Service Forecast for:
St. Charles County Issued by: NWS National Weather Service Saint Louis, MO |
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| Updated: 838 AM CDT Fri Jul 18 2025 | ||||||||||||||||||
| St. Charles , MO | ||||||||||||||||||
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| Rest Of Today |
Cloudy early this morning, then partly sunny with a chance of showers and thunderstorms this afternoon. Highs in the upper 80s. East winds around 5 mph. Chance of rain 30 percent. |
| Tonight |
Mostly cloudy in the evening, then becoming partly cloudy. A chance of showers and thunderstorms. Humid with lows in the lower 70s. South winds around 5 mph. Chance of rain 40 percent. |
| Saturday |
Mostly sunny with a chance of showers and thunderstorms. Humid with highs in the lower 90s. Southwest winds 5 to 10 mph. Chance of rain 50 percent. Heat index values up to 107 in the afternoon. |
| Saturday Night |
Partly cloudy with a slight chance of showers and thunderstorms. Humid with lows in the mid 70s. Southwest winds around 5 mph. Chance of rain 20 percent. Heat index values up to 104 early in the evening. |
| Sunday |
Mostly sunny. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Humid with highs in the mid 90s. Southwest winds around 5 mph. Chance of rain 30 percent. Heat index values up to 108. |
| Sunday Night |
Partly cloudy with a chance of showers and thunderstorms. Lows in the mid 70s. Chance of rain 40 percent. Heat index values up to 105 early in the evening. |
| Monday |
Mostly sunny with a slight chance of showers and thunderstorms. Highs in the mid 90s. Chance of rain 20 percent. Heat index values up to 110. |
| Monday Night |
Mostly clear. A slight chance of showers and thunderstorms. Hot. Lows in the upper 70s. |
| Tuesday |
Mostly clear. A slight chance of showers and thunderstorms. Hot. Highs in the mid 90s. |
| Tuesday Night |
Mostly clear. Hot. Lows in the upper 70s. |
| Wednesday |
Mostly clear. Hot. Highs in the upper 90s. |
| Wednesday Night |
Mostly clear. Hot. Lows in the upper 70s. |
| Thursday |
Mostly clear. Hot. Highs in the upper 90s. |
| Zone Forecast |
St. Charles County |
Forecast from NOAA-NWS for St. Charles County. (Zone forecast)