| National Weather Service Forecast for:
St. Charles County Issued by: NWS National Weather Service Saint Louis, MO |
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| Updated: 507 AM CDT Sun Aug 23 2026 | ||||||||||||||||||
| St. Charles , MO | ||||||||||||||||||
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| Today |
Sunny. Highs in the lower 80s. Northwest winds 5 to 10 mph. |
| Tonight |
Partly cloudy. Lows in the lower 60s. North winds around 5 mph, becoming northeast after midnight. |
| Monday |
Sunny. Highs in the lower 80s. East winds around 5 mph. |
| Monday Night |
Partly cloudy. Lows in the mid 60s. East winds around 5 mph. |
| Tuesday |
Mostly sunny. Highs in the mid 80s. Southeast winds around 5 mph. |
| Tuesday Night |
Partly cloudy. Lows in the upper 60s. |
| Wednesday |
Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the upper 80s. Chance of rain 20 percent. |
| Wednesday Night |
Mostly clear. A slight chance of showers and thunderstorms in the evening. Lows in the upper 60s. Chance of rain 20 percent. |
| Thursday |
Mostly clear. Highs in the mid 80s. |
| Thursday Night |
Mostly clear. Lows in the mid 60s. |
| Friday |
Mostly clear. Highs in the mid 80s. |
| Friday Night |
Partly cloudy. A slight chance of showers in the evening. Lows in the mid 60s. Chance of rain 20 percent. |
| Saturday |
Mostly sunny with a slight chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 20 percent. |
| Zone Forecast |
St. Charles County |
Forecast from NOAA-NWS for St. Charles County. (Zone forecast)