| National Weather Service Forecast for:
St. Charles County Issued by: NWS National Weather Service Saint Louis, MO |
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| Updated: 1049 AM CST Sat Feb 14 2026 | ||||||||||||||||||
| St. Charles , MO | ||||||||||||||||||
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| This Afternoon |
Rain, cooler. Near steady temperature in the upper 40s. Southeast winds 5 to 10 mph. Chance of rain near 100 percent. |
| Tonight |
Rain. Lows in the mid 40s. East winds 5 to 10 mph. Chance of rain near 100 percent. |
| Sunday |
Mostly cloudy with a slight chance of rain in the morning, then mostly sunny in the afternoon. Highs in the upper 50s. Northeast winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 20 percent. |
| Sunday Night |
Mostly clear. Lows in the upper 30s. North winds around 5 mph, becoming southeast after midnight. |
| Washingtons Birthday |
Mostly sunny. Highs in the lower 60s. South winds 5 to 10 mph. |
| Monday Night |
Mostly cloudy. Lows in the mid 40s. |
| Tuesday |
Mostly cloudy. Highs in the upper 60s. |
| Tuesday Night |
Mostly cloudy. Lows in the mid 50s. |
| Wednesday |
Mostly cloudy. Highs around 70. |
| Wednesday Night |
Mostly cloudy in the evening, then clearing. Cooler with lows in the mid 40s. |
| Thursday |
Partly cloudy. A 20 percent chance of rain. Highs in the upper 60s. |
| Thursday Night |
Partly cloudy. A 20 percent chance of rain. Lows in the lower 40s. |
| Friday |
Partly sunny. Much cooler with highs in the mid 50s. |
| Zone Forecast |
St. Charles County |
Forecast from NOAA-NWS for St. Charles County. (Zone forecast)