| National Weather Service Forecast for:
St. Charles County Issued by: NWS National Weather Service Saint Louis, MO |
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| Updated: 1212 AM CST Thu Feb 19 2026 | ||||||||||||||||||
| St. Charles , MO | ||||||||||||||||||
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| Rest Of Tonight |
Mostly cloudy. Near steady temperature in the lower 50s. Southeast winds around 5 mph. |
| Thursday |
Mostly cloudy with showers and thunderstorms likely in the morning, then partly sunny with a chance of showers and thunderstorms in the afternoon. Highs in the upper 60s. South winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 60 percent. |
| Thursday Night |
Mostly clear in the evening, then becoming partly cloudy. Much cooler with lows in the mid 30s. West winds 15 to 20 mph with gusts up to 35 mph. |
| Friday |
Sunny. Much cooler with highs in the upper 40s. West winds 15 to 20 mph with gusts up to 30 mph. |
| Friday Night |
Partly cloudy. Lows around 30. Northwest winds around 5 mph. |
| Saturday |
Mostly sunny with a slight chance of rain and snow. Highs in the mid 40s. Chance of precipitation 20 percent. |
| Saturday Night |
Mostly clear. Lows in the lower 20s. |
| Sunday |
Mostly clear. Highs in the upper 30s. |
| Sunday Night |
Mostly clear. Lows in the lower 20s. |
| Monday |
Mostly clear. Highs in the upper 30s. |
| Monday Night |
Mostly clear. Lows in the lower 20s. |
| Tuesday |
Mostly sunny. Not as cool with highs around 50. |
| Tuesday Night |
Mostly cloudy. Not as cool with lows in the upper 30s. |
| Wednesday |
Partly sunny with a 20 percent chance of rain. Highs in the upper 50s. |
| Zone Forecast |
St. Charles County |
Forecast from NOAA-NWS for St. Charles County. (Zone forecast)