| National Weather Service Forecast for:
St. Charles County Issued by: NWS National Weather Service Saint Louis, MO |
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| Updated: 1233 PM CDT Sun Apr 19 2026 | ||||||||||||||||||
| St. Charles , MO | ||||||||||||||||||
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| This Afternoon |
Sunny. Not as cool with highs in the upper 60s. West winds 10 to 15 mph with gusts up to 25 mph. |
| Tonight |
Partly cloudy. Lows in the lower 40s. North winds 5 to 10 mph, becoming northeast after midnight. |
| Monday |
Sunny. Highs in the upper 60s. Southeast winds 5 to 10 mph. |
| Monday Night |
Mostly clear. Lows around 50. Southeast winds 5 to 10 mph, becoming south after midnight. |
| Tuesday |
Sunny. Not as cool with highs in the upper 70s. Southwest winds 10 to 15 mph with gusts up to 25 mph. |
| Tuesday Night |
Mostly clear. Lows in the upper 50s. |
| Wednesday |
Mostly clear. Highs in the upper 70s. |
| Wednesday Night |
Mostly clear. Lows in the upper 50s. |
| Thursday |
Sunny in the morning, then becoming partly sunny. Highs in the lower 80s. |
| Thursday Night |
Mostly cloudy. A chance of showers and thunderstorms in the evening, then showers likely with a slight chance of thunderstorms after midnight. Lows in the lower 60s. Chance of rain 70 percent. |
| Friday |
Becoming partly sunny in the afternoon. A slight chance of thunderstorms. Showers likely, mainly in the morning. Highs in the mid 70s. Chance of rain 70 percent. |
| Friday Night |
Mostly cloudy with a chance of showers. A chance of thunderstorms, mainly in the evening. Cooler with lows in the lower 50s. Chance of rain 50 percent. |
| Saturday |
Mostly sunny with a slight chance of showers. A slight chance of thunderstorms in the afternoon. Highs around 70. Chance of rain 20 percent. |
| Zone Forecast |
St. Charles County |
Forecast from NOAA-NWS for St. Charles County. (Zone forecast)