| National Weather Service Forecast for:
St. Charles County Issued by: NWS National Weather Service Saint Louis, MO |
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| Updated: 1118 PM CDT Sat Aug 22 2026 | ||||||||||||||||||
| St. Charles , MO | ||||||||||||||||||
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| Overnight |
Mostly clear. Lows in the lower 60s. Northwest winds around 5 mph. |
| Sunday |
Mostly sunny. Highs in the lower 80s. Northwest winds 5 to 10 mph. |
| Sunday Night |
Mostly cloudy in the evening, then becoming partly cloudy. Lows in the lower 60s. Northeast winds around 5 mph. |
| Monday |
Mostly sunny. Highs in the lower 80s. Southeast winds around 5 mph. |
| Monday Night |
Partly cloudy with a slight chance of showers and thunderstorms. Lows in the mid 60s. East winds around 5 mph. Chance of rain 20 percent. |
| Tuesday |
Partly cloudy. Highs in the mid 80s. |
| Tuesday Night |
Partly cloudy. Lows in the upper 60s. |
| Wednesday |
Partly sunny. Highs in the upper 80s. |
| Wednesday Night |
Partly cloudy with a slight chance of showers and thunderstorms in the evening, then mostly clear after midnight. Lows in the upper 60s. Chance of rain 20 percent. |
| Thursday |
Mostly clear. Highs in the upper 80s. |
| Thursday Night |
Mostly clear. Lows in the mid 60s. |
| Friday |
Mostly clear. Highs in the upper 80s. |
| Friday Night |
Partly cloudy in the evening, then becoming mostly clear. Lows in the upper 60s. |
| Saturday |
Mostly sunny. A slight chance of showers in the morning. Highs in the upper 80s. Chance of rain 20 percent. |
| Zone Forecast |
St. Charles County |
Forecast from NOAA-NWS for St. Charles County. (Zone forecast)