| National Weather Service Forecast for:
St. Charles County Issued by: NWS National Weather Service Saint Louis, MO |
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| Updated: 606 PM CDT Thu Jun 17 2021 | ||||||||||||||||||
| St. Charles , MO | ||||||||||||||||||
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| Tonight |
Warmer. Mostly clear. Low in the mid to upper 70s. South wind around 10 mph. |
| Friday |
Very hot and humid. Mostly sunny. High 97 to 102. Highest heat index readings of around 106 in the late morning and afternoon. Southwest wind 10 to 15 mph. Gusts up to 25 mph in the afternoon. |
| Friday Night |
Partly cloudy with a 30 percent chance of showers and thunderstorms. Low in the 70s. Highest heat index readings of around 100 early in the evening. Southwest wind around 10 mph. |
| Saturday |
Hot. Partly cloudy with a 30 percent chance of showers and thunderstorms. High in the 90s. Highest heat index readings of around 100 early in the afternoon. Southwest wind around 10 mph. |
| Saturday Night |
Partly cloudy. A 20 percent chance of showers in the evening. Low in the upper 60s to mid 70s. Light wind. |
| Sunday |
Hot. Mostly sunny. A 20 percent chance of showers in the afternoon. High in the mid 90s. |
| Sunday Night |
Partly cloudy with a 30 percent chance of showers and thunderstorms. Low in the lower 70s. |
| Monday |
Partly sunny with a 50 percent chance of showers and thunderstorms. High in the mid 80s. Temperature falling into the 70s in the afternoon. |
| Monday Night |
Cooler. Partly cloudy with a 30 percent chance of showers and thunderstorms. Low in the upper 50s. |
| Tuesday |
Mostly clear. High in the upper 70s. |
| Tuesday Night |
Mostly clear. Low in the mid 50s. |
| Wednesday |
Mostly clear. High in the upper 70s. |
| Wednesday Night |
Mostly clear with a 20 percent chance of showers. Low around 60. |
| Thursday |
Partly cloudy with a 30 percent chance of showers. High in the mid 80s. |
Forecast from NOAA-NWS for St. Charles County. (Zone forecast)