| National Weather Service Forecast for:
St. Charles County Issued by: NWS National Weather Service Saint Louis, MO |
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| Updated: 1018 PM CST Sun Feb 15 2026 | ||||||||||||||||||
| St. Charles , MO | ||||||||||||||||||
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| Overnight |
Partly cloudy. Patchy fog. Lows in the upper 30s. Light and variable winds, becoming southwest around 5 mph. |
| Washingtons Birthday |
Patchy fog in the morning. Mostly sunny. Highs in the mid 60s. South winds 5 to 10 mph. |
| Monday Night |
Partly cloudy. Lows in the lower 40s. South winds 5 to 10 mph. |
| Tuesday |
Mostly cloudy. Highs in the mid 60s. South winds 15 to 20 mph. |
| Tuesday Night |
Mostly cloudy. A slight chance of showers after midnight. Not as cool. Near steady temperature in the upper 50s. South winds 15 to 20 mph with gusts up to 30 mph. Chance of rain 20 percent. |
| Wednesday |
Sunny. Highs in the lower 70s. |
| Wednesday Night |
Mostly clear in the evening, then becoming partly cloudy. Cooler with lows in the mid 40s. |
| Thursday |
Mostly clear. A slight chance of showers and thunderstorms. Highs in the lower 70s. |
| Thursday Night |
Mostly clear. A slight chance of showers and thunderstorms. Lows in the upper 30s. |
| Friday |
Mostly sunny. A slight chance of rain in the afternoon. Much cooler with highs in the lower 50s. Chance of rain 20 percent. |
| Friday Night |
Partly cloudy with a chance of rain in the evening, then mostly cloudy with a slight chance of rain after midnight. Lows in the lower 30s. Chance of rain 30 percent. |
| Saturday |
Partly cloudy. A 20 percent chance of rain. Highs in the upper 40s. |
| Saturday Night |
Partly cloudy. A 20 percent chance of rain. Lows in the upper 20s. |
| Sunday |
Sunny. Highs in the mid 40s. |
| Zone Forecast |
St. Charles County |
Forecast from NOAA-NWS for St. Charles County. (Zone forecast)