| National Weather Service Forecast for:
St. Charles County Issued by: NWS National Weather Service Saint Louis, MO |
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| Updated: 1227 AM CST Thu Feb 26 2026 | ||||||||||||||||||
| St. Charles , MO | ||||||||||||||||||
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| Rest Of Tonight |
Mostly cloudy with a 50 percent chance of rain. Lows in the mid 30s. Northeast winds 5 to 10 mph. |
| Thursday |
Partly sunny. Highs in the mid 50s. East winds 5 to 10 mph, becoming south in the afternoon. |
| Thursday Night |
Mostly clear. Lows in the mid 30s. South winds around 5 mph. |
| Friday |
Sunny. Not as cool with highs around 70. Southwest winds 15 to 20 mph. |
| Friday Night |
Mostly clear. Lows in the lower 40s. Southwest winds 5 to 10 mph, becoming north after midnight. |
| Saturday |
Mostly sunny with a 20 percent chance of rain. Highs in the mid 60s. |
| Saturday Night |
Partly cloudy with a slight chance of rain. A slight chance of freezing rain after midnight. Cooler with lows around 30. Chance of precipitation 20 percent. |
| Sunday |
Cloudy. A chance of rain and snow in the morning, then rain and snow likely in the afternoon. Light snow accumulation possible. Much cooler with highs around 40. Chance of precipitation 70 percent. |
| Sunday Night |
Cloudy. Rain and snow, mainly in the evening. Additional light snow accumulation. Lows in the upper 20s. Chance of precipitation 80 percent. |
| Monday |
Cloudy. A chance of rain and snow in the morning, then a slight chance of rain in the afternoon. Highs around 40. Chance of precipitation 30 percent. |
| Monday Night |
Mostly cloudy with a 40 percent chance of rain. Lows in the mid 20s. |
| Tuesday |
Cloudy with a 50 percent chance of rain. Highs in the lower 40s. |
| Tuesday Night |
Mostly cloudy with a 50 percent chance of rain. Lows in the lower 30s. |
| Wednesday |
Mostly cloudy with a 40 percent chance of rain. Highs in the lower 50s. |
| Zone Forecast |
St. Charles County |
Forecast from NOAA-NWS for St. Charles County. (Zone forecast)