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

Hazardous Weather Conditions

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Fog/Mist

74°F

23°C

Humidity 98%
Wind Speed Calm
Barometer 29.93 in
Dewpoint 73°F (23°C)
Visibility 1.75 mi
Last update 26 Jul 5:15 am CDT
Extended Forecast for

5 Miles SSW Carlinville IL

Extreme Heat Warning July 26, 11:00am until July 27, 09:00pm
Click here for hazard details and duration
Extreme Heat Warning

  • Today

    Today: A slight chance of showers and thunderstorms between 10am and noon. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 93. Heat index values as high as 111. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 20%.

    High: 93 °F

    Slight Chance
    T-storms and
    Patchy Fog
    then Partly
    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 75. Light and variable wind.

    Low: 75 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 94. Heat index values as high as 109. Light and variable wind becoming southwest 5 to 10 mph in the morning.

    High: 94 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 75. Southwest wind 6 to 9 mph becoming west after midnight.

    Low: 75 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 89. North wind 5 to 9 mph.

    High: 89 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 66.

    Low: 66 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 86.

    High: 86 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 62.

    Low: 62 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 87.

    High: 87 °F

    Sunny

Detailed Forecast

Today
A slight chance of showers and thunderstorms between 10am and noon. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 93. Heat index values as high as 111. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 20%.
Tonight
Partly cloudy, with a low around 75. Light and variable wind.
Monday
Sunny, with a high near 94. Heat index values as high as 109. Light and variable wind becoming southwest 5 to 10 mph in the morning.
Monday Night
Mostly clear, with a low around 75. Southwest wind 6 to 9 mph becoming west after midnight.
Tuesday
Sunny, with a high near 89. North wind 5 to 9 mph.
Tuesday Night
Partly cloudy, with a low around 66.
Wednesday
Sunny, with a high near 86.
Wednesday Night
Clear, with a low around 62.
Thursday
Sunny, with a high near 87.
Thursday Night
A 20 percent chance of showers after 1am. Partly cloudy, with a low around 65.
Friday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 85.
Friday Night
A 30 percent chance of showers. Partly cloudy, with a low around 65.
Saturday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 85.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
5 Miles SSW Carlinville IL
 39.21°N 89.89°W (Elev. 610 ft)
Last Update:
4:51 am CDT Jul 26, 2026
Forecast Valid:
5am CDT Jul 26, 2026-6pm CDT Aug 1, 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