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.

Fair

79°F

26°C

Humidity 89%
Wind Speed S 9 mph
Barometer 29.98 in
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 29 Jun 7:50 am CDT
Extended Forecast for

4 Miles SSE Carlinville IL

Heat Advisory June 29, 08:42am until July 3, 10:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory June 29, 08:42am until July 3, 10:00pm

    NOW until 10:00pm Fri

    Heat Advisory

  • Today

    High: 93 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 74. South wind 6 to 11 mph, with gusts as high as 20 mph.

    Low: 74 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 95. Heat index values as high as 106. Southwest wind 6 to 10 mph.

    High: 95 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 73. South wind 5 to 7 mph.

    Low: 73 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 95. Southwest wind 3 to 8 mph.

    High: 95 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 75.

    Low: 75 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 95.

    High: 95 °F

    Sunny

  • Thursday Night

    Thursday Night: A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74.

    Low: 74 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

Detailed Forecast

Today
Mostly sunny, with a high near 93. Heat index values as high as 106. South wind 7 to 13 mph, with gusts as high as 21 mph.
Tonight
Mostly clear, with a low around 74. South wind 6 to 11 mph, with gusts as high as 20 mph.
Tuesday
Sunny, with a high near 95. Heat index values as high as 106. Southwest wind 6 to 10 mph.
Tuesday Night
Clear, with a low around 73. South wind 5 to 7 mph.
Wednesday
Sunny, with a high near 95. Southwest wind 3 to 8 mph.
Wednesday Night
Mostly clear, with a low around 75.
Thursday
Sunny, with a high near 95.
Thursday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74.
Friday
A 30 percent chance of showers and thunderstorms, mainly before 1pm. Mostly sunny, with a high near 92.
Friday Night
Partly cloudy, with a low around 73.
Independence Day
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.
Saturday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Sunday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSE Carlinville IL
 39.23°N 89.86°W (Elev. 633 ft)
Last Update:
7:36 am CDT Jun 29, 2026
Forecast Valid:
8am CDT Jun 29, 2026-6pm CDT Jul 5, 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