| National Weather Service Forecast for:
St. Charles County Issued by: NWS National Weather Service Saint Louis, MO |
||||||||||||||||||
| Updated: 127 AM CDT Thu Mar 12 2026 | ||||||||||||||||||
| St. Charles , MO | ||||||||||||||||||
|
| Rest Of Tonight |
Mostly clear. Much cooler with lows in the lower 30s. Northwest winds 5 to 10 mph with gusts up to 20 mph. |
| Thursday |
Sunny. Highs in the mid 50s. West winds 5 to 10 mph, becoming southwest 10 to 15 mph in the afternoon. |
| Thursday Night |
Mostly clear in the evening, then becoming partly cloudy. Not as cool with lows in the mid 40s. South winds 15 to 20 mph. Gusts up to 40 mph after midnight. |
| Friday |
Partly sunny. Highs around 60. West winds 15 to 20 mph with gusts up to 30 mph. |
| Friday Night |
Partly cloudy in the evening, then becoming mostly cloudy. Lows in the mid 30s. North winds 5 to 10 mph with gusts up to 20 mph, becoming northeast after midnight. |
| Saturday |
Partly sunny. Highs in the lower 60s. |
| Saturday Night |
Mostly cloudy. A slight chance of rain after midnight. Not as cool with lows in the lower 50s. Chance of rain 20 percent. |
| Sunday |
Rain likely with a slight chance of thunderstorms in the morning, then rain in the afternoon. Breezy with highs in the upper 60s. Temperature falling to around 60 in the afternoon. Chance of rain 90 percent. |
| Sunday Night |
Rain, snow likely with a slight chance of thunderstorms in the evening, then a chance of snow after midnight. Light snow accumulation possible. Windy and much cooler with lows in the lower 20s. Chance of precipitation 60 percent. |
| Monday |
Partly sunny in the morning, then clearing. Breezy and much cooler with highs in the lower 30s. |
| Monday Night |
Mostly clear. Lows around 15. |
| Tuesday |
Partly sunny. Highs around 40. |
| Tuesday Night |
Mostly cloudy. A slight chance of rain and snow after midnight. Not as cool with lows around 30. Chance of precipitation 20 percent. |
| Wednesday |
Mostly cloudy in the morning, then becoming partly sunny. Not as cool with highs in the upper 50s. |
| Zone Forecast |
St. Charles County |
Forecast from NOAA-NWS for St. Charles County. (Zone forecast)