| National Weather Service Forecast for:
St. Charles County Issued by: NWS National Weather Service Saint Louis, MO |
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| Updated: 224 AM CST Mon Jan 5 2026 | ||||||||||||||||||
| St. Charles , MO | ||||||||||||||||||
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| Rest Of Tonight |
Clear. Near steady temperature in the mid 30s. South winds around 5 mph. |
| Monday |
Sunny. Not as cool with highs in the upper 50s. South winds 5 to 10 mph. |
| Monday Night |
Partly cloudy in the evening, then becoming mostly cloudy. Not as cool. Near steady temperature in the upper 40s. South winds 5 to 10 mph with gusts up to 20 mph. |
| Tuesday |
Partly sunny in the morning, then clearing. Highs around 60. West winds 10 to 15 mph. |
| Tuesday Night |
Mostly clear. Cooler with lows in the mid 30s. West winds around 5 mph. |
| Wednesday |
Mostly sunny. Highs around 60. |
| Wednesday Night |
Mostly cloudy. A slight chance of rain after midnight. Not as cool with lows in the upper 40s. Chance of rain 20 percent. |
| Thursday |
Mostly cloudy. A chance of rain in the morning, then rain likely in the afternoon. Highs in the lower 60s. Chance of rain 70 percent. |
| Thursday Night |
Mostly cloudy. Rain likely with a slight chance of thunderstorms in the evening, then a chance of rain after midnight. Lows around 50. Chance of rain 70 percent. |
| Friday |
A slight chance of thunderstorms in the morning. Partly sunny with a chance of rain. Highs in the lower 60s. Temperature falling into the mid 50s in the afternoon. Chance of rain 50 percent. |
| Friday Night |
Mostly cloudy with a slight chance of rain in the evening, then partly cloudy after midnight. Much cooler with lows in the mid 30s. Chance of rain 20 percent. |
| Saturday |
Partly cloudy. Highs in the mid 40s. |
| Saturday Night |
Partly cloudy. Lows in the mid 20s. |
| Sunday |
Mostly sunny. Highs in the upper 30s. |
| Zone Forecast |
St. Charles County |
Forecast from NOAA-NWS for St. Charles County. (Zone forecast)