| National Weather Service Forecast for:
St. Charles County Issued by: NWS National Weather Service Saint Louis, MO |
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| Updated: 127 AM CDT Wed Mar 18 2026 | ||||||||||||||||||
| St. Charles , MO | ||||||||||||||||||
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| Rest Of Tonight |
Cloudy with a chance of flurries. Not as cool. Near steady temperature in the lower 30s. South winds 10 to 15 mph with gusts up to 30 mph. |
| Wednesday |
Partly sunny in the morning, then clearing. Not as cool with highs in the mid 60s. South winds 10 to 15 mph, becoming west 5 to 10 mph in the afternoon. |
| Wednesday Night |
Mostly cloudy. Not as cool with lows in the mid 40s. South winds around 5 mph. |
| Thursday |
Partly sunny in the morning, then clearing. Highs in the lower 70s. Southwest winds around 5 mph, becoming northwest in the afternoon. |
| Thursday Night |
Mostly clear in the evening, then becoming partly cloudy. Lows in the upper 40s. Northeast winds around 5 mph, becoming southeast around 5 mph after midnight. |
| Friday |
Sunny. Highs in the upper 70s. |
| Friday Night |
Partly cloudy. Lows in the lower 50s. |
| Saturday |
Mostly clear. Highs in the upper 70s. |
| Saturday Night |
Mostly clear. Lows in the mid 50s. |
| Sunday |
Partly cloudy. Highs in the upper 70s. |
| Sunday Night |
Partly cloudy. Lows in the upper 30s. |
| Monday |
Mostly cloudy. Highs in the lower 50s. |
| Monday Night |
Mostly cloudy. Lows in the mid 30s. |
| Tuesday |
Partly sunny. A slight chance of rain in the afternoon. Highs in the upper 50s. Chance of rain 20 percent. |
| Zone Forecast |
St. Charles County |
Forecast from NOAA-NWS for St. Charles County. (Zone forecast)