| National Weather Service Forecast for:
St. Charles County Issued by: NWS National Weather Service Saint Louis, MO |
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| Updated: 503 PM CST Wed Dec 17 2025 | ||||||||||||||||||
| St. Charles , MO | ||||||||||||||||||
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| Tonight |
Mostly cloudy. Isolated showers after midnight. Not as cool with lows in the mid 40s. Temperature rising into the lower 50s after midnight. South winds 15 to 20 mph. Chance of rain 20 percent. |
| Thursday |
Cloudy with showers in the morning, then mostly sunny with scattered showers in the afternoon. Highs in the mid 50s. Temperature falling into the mid 40s in the afternoon. Southwest winds 15 to 20 mph, becoming west in the afternoon. Gusts up to 35 mph. Chance of rain 80 percent. |
| Thursday Night |
Partly cloudy in the evening, then becoming mostly clear. Much cooler with lows in the mid 20s. West winds 15 to 20 mph with gusts up to 35 mph. |
| Friday |
Sunny. Much cooler with highs in the upper 30s. West winds 5 to 10 mph with gusts up to 20 mph, becoming southwest in the afternoon. |
| Friday Night |
Partly cloudy. Near steady temperature in the mid 30s. South winds 10 to 15 mph with gusts up to 25 mph. |
| Saturday |
Partly cloudy. Highs in the mid 50s. |
| Saturday Night |
Partly cloudy. Lows in the mid 20s. |
| Sunday |
Mostly sunny. Cooler with highs in the lower 40s. |
| Sunday Night |
Mostly cloudy. Lows around 30. |
| Monday |
Mostly cloudy. Highs in the upper 40s. |
| Monday Night |
Mostly cloudy and not as cool. Near steady temperature in the lower 40s. |
| Tuesday |
Partly sunny. A slight chance of rain in the morning. Not as cool with highs in the upper 50s. Chance of rain 20 percent. |
| Tuesday Night |
Mostly cloudy. Lows in the lower 40s. |
| Wednesday |
Mostly cloudy. Highs in the upper 50s. |
| Zone Forecast |
St. Charles County |
Forecast from NOAA-NWS for St. Charles County. (Zone forecast)