Current conditions at

St. Charles, St. Charles County Smartt Airport (KSET)

Lat: 38.93° N Lon: 90.43° W Elev: 436 ft.

Fair

80°F

27°C

Humidity 82%
Wind Speed S 6 mph
Barometer 29.98 in (1014.4 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 30 Jun 11:54 pm CDT
Detailed forecast for

Jersey County

Overnight
Clear. Lows in the mid 70s. South winds 5 to 10 mph.
Wednesday
Sunny, hot with highs in the mid 90s. Southwest winds 5 to 10 mph. Heat index values up to 106.
Wednesday Night
Mostly clear. Lows in the mid 70s. South winds 5 to 10 mph. Heat index values up to 106 early in the evening.
Thursday
Sunny, hot with highs in the mid 90s. Southwest winds 5 to 10 mph. Heat index values up to 107.
Thursday Night
Mostly clear in the evening, then becoming partly cloudy. Humid with lows in the mid 70s. South winds around 5 mph. Heat index values up to 105 early in the evening.
Friday
Sunny. A slight chance of showers and thunderstorms in the afternoon. Hot with highs in the mid 90s. Chance of rain 20 percent. Heat index values up to 105.
Friday Night
Partly cloudy with a slight chance of showers and thunderstorms. Lows in the lower 70s. Chance of rain 20 percent. Heat index values up to 105 early in the evening.
Independence Day
Mostly sunny. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Highs in the lower 90s. Chance of rain 40 percent. Heat index values up to 105.
Saturday Night
Partly cloudy with a chance of showers and thunderstorms. Lows in the lower 70s. Chance of rain 50 percent. Heat index values up to 100 early in the evening.
Sunday And Sunday Night
Partly cloudy. A slight chance of showers and thunderstorms. Highs in the lower 90s. Lows in the lower 70s. Chance of rain 20 percent. Heat index values up to 100.
Monday Through Tuesday
Partly cloudy with a chance of showers and thunderstorms. Highs around 90. Lows in the upper 60s. Chance of rain 30 percent.



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1128 PM CDT Tue Jun 30 2026
 
 

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