National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Heat Persists in the South Central U.S. and California; Heavy Rain in the Ohio Valley

Sweltering heat remains across the South-Central Plains and Lower/Middle Mississippi Valley, as well as in the Southwest and California this week with limited nighttime relief. Heavy rainfall will lead to localized areas of flash flooding in parts of the Ohio Valley/Central Appalachians. Dry and breezy conditions will enhance fire weather concerns across the northern Rockies and High Plains. Read More >

Current conditions at

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

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Partly Cloudy

72°F

22°C

Humidity 91%
Wind Speed SE 10 mph
Barometer 29.98 in (1014.5 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Last update 10 Sep 1:54 am CDT
Extended Forecast for

5 Miles WSW Fidelity IL

  • Overnight

    Overnight: Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 67. Calm wind. Chance of precipitation is 80%.

    Low: 67 °F

    Heavy Rain

  • Thursday

    Thursday: Showers and possibly a thunderstorm before 10am, then showers likely between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. High near 78. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 90%.

    High: 78 °F

    Showers then
    Showers
    Likely

  • Thursday Night

    Thursday Night: A 20 percent chance of showers before 9pm. Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 63. Light northeast wind.

    Low: 63 °F

    Slight Chance
    Showers then
    Patchy Fog

  • Friday

    Friday: A 20 percent chance of showers after 1pm. Patchy fog before 8am. Otherwise, partly sunny, with a high near 81. Southeast wind 3 to 6 mph.

    High: 81 °F

    Patchy Fog
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 64. Light southeast wind.

    Low: 64 °F

    Partly Cloudy

  • Saturday

    Saturday: A 30 percent chance of showers after 1pm. Mostly sunny, with a high near 87.

    High: 87 °F

    Partly Sunny
    then Chance
    Showers

  • Saturday Night

    Saturday Night: A 20 percent chance of showers before 1am. Partly cloudy, with a low around 64.

    Low: 64 °F

    Slight Chance
    Showers

  • Sunday

    Sunday: Mostly sunny, with a high near 87.

    High: 87 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 66.

    Low: 66 °F

    Slight Chance
    T-storms

Detailed Forecast

Overnight
Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 67. Calm wind. Chance of precipitation is 80%.
Thursday
Showers and possibly a thunderstorm before 10am, then showers likely between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. High near 78. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 90%.
Thursday Night
A 20 percent chance of showers before 9pm. Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 63. Light northeast wind.
Friday
A 20 percent chance of showers after 1pm. Patchy fog before 8am. Otherwise, partly sunny, with a high near 81. Southeast wind 3 to 6 mph.
Friday Night
Partly cloudy, with a low around 64. Light southeast wind.
Saturday
A 30 percent chance of showers after 1pm. Mostly sunny, with a high near 87.
Saturday Night
A 20 percent chance of showers before 1am. Partly cloudy, with a low around 64.
Sunday
Mostly sunny, with a high near 87.
Sunday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 66.
Monday
Sunny, with a high near 91.
Monday Night
A 30 percent chance of showers and thunderstorms. Mostly clear, with a low around 67.
Tuesday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 84.
Tuesday Night
A 40 percent chance of showers. Partly cloudy, with a low around 60.
Wednesday
A 40 percent chance of showers. Mostly sunny, with a high near 81.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
5 Miles WSW Fidelity IL
 39.13°N 90.24°W (Elev. 600 ft)
Last Update:
1:26 am CDT Sep 10, 2026
Forecast Valid:
3am CDT Sep 10, 2026-6pm CDT Sep 16, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation