| National Weather Service Forecast for:
St. Charles County Issued by: NWS National Weather Service Saint Louis, MO |
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| Updated: 523 PM CST Wed Jan 7 2026 | ||||||||||||||||||
| St. Charles , MO | ||||||||||||||||||
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| Tonight |
Partly cloudy this evening, then becoming mostly cloudy. Not as cool with lows in the mid 40s. Southeast winds 5 to 10 mph with gusts up to 20 mph. |
| Thursday |
Cloudy. Rain likely in the morning, then showers with a slight chance of thunderstorms in the afternoon. Highs in the mid 60s. South winds 15 to 20 mph. Gusts up to 30 mph, increasing to 40 mph in the afternoon. Chance of rain 80 percent. |
| Thursday Night |
Mostly cloudy with showers likely with a chance of thunderstorms in the evening, then partly cloudy with a chance of showers after midnight. Lows in the lower 50s. Southwest winds 15 to 20 mph. Gusts up to 35 mph in the evening. Chance of rain 70 percent. |
| Friday |
Partly sunny. Highs in the upper 50s. Northwest winds 5 to 10 mph. |
| Friday Night |
Mostly cloudy. A slight chance of rain in the evening, then a chance of rain after midnight. Cooler with lows in the upper 30s. North winds 5 to 10 mph. Chance of rain 40 percent. |
| Saturday |
Mostly cloudy with a slight chance of rain in the morning, then mostly sunny in the afternoon. Cooler with highs in the mid 40s. Chance of rain 20 percent. |
| Saturday Night |
Partly cloudy. Cooler with lows in the mid 20s. |
| Sunday |
Mostly clear. Highs in the mid 30s. |
| Sunday Night |
Mostly clear. Lows in the lower 20s. |
| Monday |
Mostly clear. Highs in the upper 40s. |
| Monday Night |
Mostly clear. Lows in the lower 30s. |
| Tuesday |
Mostly sunny. Highs in the lower 50s. |
| Tuesday Night |
Mostly cloudy. Lows in the mid 30s. |
| Wednesday |
Partly sunny in the morning, then becoming mostly cloudy. A 20 percent chance of rain. Highs in the lower 40s. |
| Zone Forecast |
St. Charles County |
Forecast from NOAA-NWS for St. Charles County. (Zone forecast)