| National Weather Service Forecast for:
St. Charles County Issued by: NWS National Weather Service Saint Louis, MO |
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| Updated: 732 PM CDT Fri Mar 20 2026 | ||||||||||||||||||
| St. Charles , MO | ||||||||||||||||||
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| Tonight |
Partly cloudy this evening, then clearing. Lows in the lower 50s. North winds 5 to 10 mph, becoming northeast after midnight. |
| Saturday |
Sunny. Highs in the upper 80s. East winds around 5 mph, becoming south in the afternoon. |
| Saturday Night |
Clear. Not as cool with lows in the lower 60s. South winds 5 to 10 mph. |
| Sunday |
Mostly sunny. Highs in the mid 80s. Southwest winds 5 to 10 mph, becoming west 10 to 15 mph in the afternoon. |
| Sunday Night |
Mostly cloudy in the evening, then clearing. Much cooler with lows around 40. North winds 15 to 20 mph with gusts up to 30 mph. |
| Monday |
Sunny. Much cooler with highs in the upper 50s. |
| Monday Night |
Mostly clear in the evening, then becoming mostly cloudy. Lows around 40. |
| Tuesday |
Mostly cloudy in the morning, then becoming mostly sunny. Highs around 60. |
| Tuesday Night |
Partly cloudy in the evening, then mostly cloudy with a slight chance of rain and thunderstorms after midnight. Lows in the lower 40s. Chance of rain 20 percent. |
| Wednesday |
Mostly cloudy in the morning, then becoming partly sunny. Highs in the upper 60s. |
| Wednesday Night |
Mostly cloudy in the evening, then becoming partly cloudy. Lows in the lower 50s. |
| Thursday |
Sunny. A slight chance of rain in the afternoon. Not as cool with highs in the upper 70s. Chance of rain 20 percent. |
| Thursday Night |
Mostly cloudy. A 50 percent chance of rain. Lows in the lower 40s. Highs in the lower 50s.. |
| Friday |
Mostly cloudy. A 50 percent chance of rain. Lows in the lower 40s. Highs in the lower 50s.. |
| Zone Forecast |
St. Charles County |
Forecast from NOAA-NWS for St. Charles County. (Zone forecast)