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.

Mostly Cloudy

75°F

24°C

Humidity 94%
Wind Speed E 6 mph
Barometer 30.00 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Last update 13 Jul 6:50 pm CDT
Extended Forecast for

Glen Carbon IL

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 10pm. Patchy fog after 1am. Otherwise, cloudy, then gradually becoming partly cloudy, with a low around 68. Light and variable wind.

    Low: 68 °F

    Slight Chance
    T-storms then
    Patchy Fog

  • Monday

    Monday: Areas of fog before 9am. Otherwise, partly sunny, with a high near 86. Light and variable wind.

    High: 86 °F

    Areas Fog
    then Mostly
    Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 71. South wind around 6 mph becoming calm in the evening.

    Low: 71 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 90. Calm wind becoming south around 6 mph in the morning.

    High: 90 °F

    Partly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72. South wind around 6 mph becoming calm in the evening.

    Low: 72 °F

    Slight Chance
    T-storms

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 91.

    High: 91 °F

    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.

    Low: 74 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 92.

    High: 92 °F

    Mostly Sunny
    then Chance
    T-storms

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 73.

    Low: 73 °F

    Chance
    T-storms

Detailed Forecast

Tonight
A 20 percent chance of showers and thunderstorms before 10pm. Patchy fog after 1am. Otherwise, cloudy, then gradually becoming partly cloudy, with a low around 68. Light and variable wind.
Monday
Areas of fog before 9am. Otherwise, partly sunny, with a high near 86. Light and variable wind.
Monday Night
Mostly cloudy, with a low around 71. South wind around 6 mph becoming calm in the evening.
Tuesday
A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 90. Calm wind becoming south around 6 mph in the morning.
Tuesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72. South wind around 6 mph becoming calm in the evening.
Wednesday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 91.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Thursday
A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 92.
Thursday Night
A 30 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 73.
Friday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 89.
Friday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72.
Saturday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.
Saturday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Glen Carbon IL
 38.77°N 89.94°W (Elev. 564 ft)
Last Update:
7:37 pm CDT Jul 13, 2025
Forecast Valid:
7pm CDT Jul 13, 2025-6pm CDT Jul 20, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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