| National Weather Service Forecast for:
St. Charles County Issued by: NWS National Weather Service Saint Louis, MO |
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| Updated: 838 AM CST Thu Dec 25 2025 | ||||||||||||||||||
| St. Charles , MO | ||||||||||||||||||
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| Today |
Cloudy. Widespread dense fog this morning, then patchy dense fog this afternoon. Highs in the mid 60s. Northeast winds around 5 mph, becoming east around 5 mph this afternoon. |
| Tonight |
Mostly cloudy. Patchy dense fog. Near steady temperature in the upper 50s. South winds 5 to 10 mph with gusts up to 20 mph. |
| Friday |
Mostly sunny. Highs in the upper 60s. Southwest winds 5 to 10 mph with gusts up to 20 mph, becoming west in the afternoon. |
| Friday Night |
Partly cloudy in the evening, then becoming mostly cloudy. Cooler with lows in the mid 40s. North winds around 5 mph, becoming east after midnight. |
| Saturday |
Partly sunny in the morning, then becoming mostly cloudy. Highs in the mid 60s. Southeast winds 5 to 10 mph. |
| Saturday Night |
Mostly cloudy. A slight chance of rain and thunderstorms after midnight. Not as cool. Near steady temperature around 60. Chance of rain 20 percent. |
| Sunday |
Rain likely in the morning, then rain likely with a chance of thunderstorms in the afternoon. Highs in the mid 60s. Temperature falling into the mid 50s in the afternoon. Chance of rain 70 percent. |
| Sunday Night |
Mostly cloudy with a chance of rain with a slight chance of snow in the evening, then partly cloudy after midnight. Breezy and much cooler with lows around 20. Chance of precipitation 50 percent. |
| Monday |
Mostly clear. Highs in the upper 20s. |
| Monday Night |
Mostly clear. Wind chill values as low as 5. |
| Tuesday |
Mostly clear. Highs in the mid 30s. |
| Tuesday Night |
Mostly clear. Lows in the lower 20s. |
| Wednesday |
Partly sunny. Highs in the lower 40s. |
| Zone Forecast |
St. Charles County |
Forecast from NOAA-NWS for St. Charles County. (Zone forecast)