| National Weather Service Forecast for:
St. Charles County Issued by: NWS National Weather Service Saint Louis, MO |
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| Updated: 540 AM CDT Mon May 19 2025 | ||||||||||||||||||
| St. Charles , MO | ||||||||||||||||||
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| Today |
Mostly cloudy this morning, then becoming partly sunny. A chance of thunderstorms. Showers likely, mainly this morning. Highs in the upper 70s. Southeast winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 60 percent. |
| Tonight |
Thunderstorms likely. Showers. Lows in the mid 60s. Southeast winds 10 to 15 mph with gusts up to 30 mph. Chance of rain near 100 percent. |
| Tuesday |
Mostly sunny. Showers and thunderstorms likely, mainly in the morning. Highs around 80. South winds 10 to 15 mph, becoming southwest in the afternoon. Chance of rain 70 percent. |
| Tuesday Night |
Mostly clear. A slight chance of showers and thunderstorms in the evening. Cooler. Less humid with lows in the mid 50s. West winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 20 percent. |
| Wednesday |
Mostly sunny. Cooler with highs in the upper 60s. West winds 15 to 20 mph with gusts up to 30 mph. |
| Wednesday Night |
Partly cloudy with a 20 percent chance of showers. Lows around 50. |
| Thursday |
Mostly sunny. Highs in the mid 60s. |
| Thursday Night |
Partly cloudy in the evening, then becoming mostly clear. Lows in the upper 40s. |
| Friday |
Mostly sunny. Highs around 70. |
| Friday Night |
Mostly cloudy. A slight chance of showers in the evening, then a chance of showers after midnight. Lows in the lower 50s. Chance of rain 40 percent. |
| Saturday |
Mostly cloudy with a slight chance of thunderstorms. A chance of showers. Highs in the upper 60s. Chance of rain 40 percent. |
| Saturday Night |
Mostly cloudy. A chance of showers with a slight chance of thunderstorms. Lows in the mid 50s. Highs in the lower 70s.. |
| Sunday |
Mostly cloudy. A chance of showers with a slight chance of thunderstorms. Lows in the mid 50s. Highs in the lower 70s.. |
| Zone Forecast |
St. Charles County |
Forecast from NOAA-NWS for St. Charles County. (Zone forecast)