| National Weather Service Forecast for:
St. Charles County Issued by: NWS National Weather Service Saint Louis, MO |
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| Updated: 1023 AM CDT Wed Jul 22 2026 | ||||||||||||||||||
| St. Charles , MO | ||||||||||||||||||
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| Rest Of Today |
Sunny. Highs in the lower 80s. Northeast winds 5 to 10 mph. |
| Tonight |
Partly cloudy in the evening, then clearing. Lows in the lower 60s. Northeast winds 5 to 10 mph. |
| Thursday |
Sunny. Highs in the lower 80s. East winds around 5 mph. |
| Thursday Night |
Mostly cloudy. Lows in the lower 60s. East winds around 5 mph. |
| Friday |
Mostly cloudy with a chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the upper 70s. Southeast winds around 5 mph. Chance of rain 50 percent. |
| Friday Night |
Mostly cloudy. A slight chance of showers and thunderstorms in the evening, then a chance of showers and thunderstorms after midnight. Lows in the mid 60s. Chance of rain 50 percent. |
| Saturday |
Mostly sunny. A slight chance of showers and thunderstorms in the morning. Warmer with highs in the upper 80s. Chance of rain 20 percent. |
| Saturday Night |
Mostly clear. Lows in the lower 70s. |
| Sunday |
Mostly sunny. Hot with highs in the mid 90s. Heat index values up to 110. |
| Sunday Night |
Mostly clear. Lows in the mid 70s. Heat index values up to 110 early in the evening. |
| Monday |
Mostly sunny. Hot with highs in the mid 90s. Heat index values up to 110 in the afternoon. |
| Monday Night |
Mostly clear. Lows in the mid 70s. Heat index values up to 110 early in the evening. |
| Tuesday |
Mostly 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)