| National Weather Service Forecast for:
St. Charles County Issued by: NWS National Weather Service Saint Louis, MO |
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| Updated: 208 PM CDT Wed Oct 14 2026 | ||||||||||||||||||
| St. Charles , MO | ||||||||||||||||||
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| This Afternoon |
Cloudy with a chance of showers with a slight chance of thunderstorms. Much cooler. Near steady temperature in the mid 70s. Northwest winds around 5 mph. Chance of rain 30 percent. |
| Tonight |
Cloudy. Showers likely with a chance of thunderstorms after midnight. Lows in the upper 60s. Northeast winds around 5 mph. Chance of rain 70 percent. |
| Thursday |
Mostly cloudy with a chance of thunderstorms. Showers, mainly in the morning. Highs in the lower 80s. East winds 5 to 10 mph, becoming south in the afternoon. Chance of rain 90 percent. |
| Thursday Night |
Mostly cloudy with a chance of showers. A chance of thunderstorms, mainly in the evening. Much cooler with lows in the upper 40s. West winds 10 to 15 mph, becoming northwest 15 to 20 mph with gusts up to 30 mph after midnight. Chance of rain 50 percent. |
| Friday |
Mostly cloudy. A slight chance of showers in the afternoon. Much cooler. Less humid with highs in the mid 50s. Northwest winds 15 to 20 mph with gusts up to 30 mph. Chance of rain 20 percent. |
| Friday Night |
Mostly cloudy in the evening, then becoming partly cloudy. Lows around 40. |
| Saturday |
Sunny. Highs in the lower 60s. |
| Saturday Night |
Clear. Lows in the upper 30s. |
| Sunday |
Clear. Highs in the upper 60s. |
| Sunday Night |
Mostly clear in the evening, then becoming partly cloudy. Lows in the lower 40s. |
| Monday |
Partly cloudy. Highs in the mid 70s. |
| Monday Night |
Partly cloudy. Lows in the mid 40s. |
| Tuesday |
Partly cloudy. Highs in the mid 70s. |
| Zone Forecast |
St. Charles County |
Forecast from NOAA-NWS for St. Charles County. (Zone forecast)