| National Weather Service Forecast for:
St. Charles County Issued by: NWS National Weather Service Saint Louis, MO |
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| Updated: 459 PM CST Sat Jan 3 2026 | ||||||||||||||||||
| St. Charles , MO | ||||||||||||||||||
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| Tonight |
Mostly clear this evening, then becoming partly cloudy. Lows in the mid 20s. North winds around 5 mph. |
| Sunday |
Mostly sunny in the morning, then becoming mostly cloudy. Highs in the lower 40s. Southeast winds 5 to 10 mph. |
| Sunday Night |
Partly cloudy in the evening, then becoming mostly clear. Lows in the lower 30s. South winds 5 to 10 mph with gusts up to 20 mph. |
| Monday |
Sunny. Not as cool with highs in the upper 50s. South winds 5 to 10 mph. |
| Monday Night |
Partly cloudy. Not as cool with lows in the mid 40s. South winds around 5 mph. |
| Tuesday |
Partly cloudy. Highs in the lower 60s. |
| Tuesday Night |
Partly cloudy. Lows in the upper 30s. |
| Wednesday |
Partly cloudy. Highs in the lower 60s. |
| Wednesday Night |
Partly cloudy in the evening, then mostly cloudy with a chance of rain after midnight. Lows in the mid 40s. Chance of rain 30 percent. |
| Thursday |
Mostly cloudy with a 50 percent chance of rain. Highs in the lower 60s. |
| Thursday Night |
Mostly cloudy with a 40 percent chance of rain. Lows in the mid 40s. |
| Friday |
Mostly cloudy. A 20 percent chance of rain. Highs in the upper 50s. |
| Friday Night |
Mostly cloudy. A 20 percent chance of rain. Lows in the mid 30s. |
| Saturday |
Partly sunny. Cooler with highs in the mid 40s. |
| Zone Forecast |
St. Charles County |
Forecast from NOAA-NWS for St. Charles County. (Zone forecast)