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

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Fair

8°F

-13°C

Humidity 80%
Wind Speed Calm
Barometer 30.23 in
Dewpoint 3°F (-16°C)
Visibility 10.00 mi
Last update 4 Dec 11:15 pm CST
Extended Forecast for

Gillespie IL

  • Tonight

    Tonight: Patchy fog between midnight and 5am. Otherwise, mostly clear, with a low around 2. Calm wind becoming south around 5 mph after midnight.

    Low: 2 °F

    Patchy Fog

  • Friday

    Friday: Sunny, with a high near 34. South wind 6 to 8 mph.

    High: 34 °F

    Sunny

  • Friday Night

    Friday Night: Increasing clouds, with a low around 24. South wind 5 to 7 mph becoming light and variable after midnight.

    Low: 24 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Partly sunny, with a high near 33. Light and variable wind.

    High: 33 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of snow after midnight. Cloudy, with a low around 25. East wind 3 to 6 mph.

    Low: 25 °F

    Mostly Cloudy
    then Chance
    Snow

  • Sunday

    Sunday: A chance of rain and snow before noon, then a slight chance of snow. Mostly cloudy, with a high near 32. Chance of precipitation is 30%.

    High: 32 °F

    Chance
    Rain/Snow
    then Slight
    Chance Snow

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 10.

    Low: 10 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 28.

    High: 28 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 19.

    Low: 19 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Patchy fog between midnight and 5am. Otherwise, mostly clear, with a low around 2. Calm wind becoming south around 5 mph after midnight.
Friday
Sunny, with a high near 34. South wind 6 to 8 mph.
Friday Night
Increasing clouds, with a low around 24. South wind 5 to 7 mph becoming light and variable after midnight.
Saturday
Partly sunny, with a high near 33. Light and variable wind.
Saturday Night
A 30 percent chance of snow after midnight. Cloudy, with a low around 25. East wind 3 to 6 mph.
Sunday
A chance of rain and snow before noon, then a slight chance of snow. Mostly cloudy, with a high near 32. Chance of precipitation is 30%.
Sunday Night
Mostly cloudy, with a low around 10.
Monday
Mostly sunny, with a high near 28.
Monday Night
Mostly cloudy, with a low around 19.
Tuesday
Mostly sunny, with a high near 39.
Tuesday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 28.
Wednesday
A 40 percent chance of rain. Mostly cloudy, with a high near 41.
Wednesday Night
Mostly cloudy, with a low around 19.
Thursday
Partly sunny, with a high near 30.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Gillespie IL
 39.12°N 89.81°W (Elev. 653 ft)
Last Update:
8:26 pm CST Dec 4, 2025
Forecast Valid:
11pm CST Dec 4, 2025-6pm CST Dec 11, 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