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.

Overcast

25°F

-4°C

Humidity 80%
Wind Speed W 7 mph
Barometer 30.10 in
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill17°F (-8°C)
Last update 2 Dec 2:50 pm CST
Extended Forecast for

Gillespie IL

  • Tonight

    Tonight: Partly cloudy, with a low around 15. South wind 3 to 6 mph.

    Low: 15 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Increasing clouds, with a high near 36. South wind around 7 mph becoming northwest in the afternoon.

    High: 36 °F

    Increasing
    Clouds

  • Wednesday Night

    Wednesday Night: A 30 percent chance of snow, mainly between 9pm and midnight. Mostly cloudy, with a low around 9. North wind 6 to 10 mph.

    Low: 9 °F

    Chance Snow

  • Thursday

    Thursday: Mostly sunny and cold, with a high near 19. North wind 5 to 8 mph becoming calm in the afternoon.

    High: 19 °F

    Cold

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 6. Light and variable wind.

    Low: 6 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 33.

    High: 33 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 18.

    Low: 18 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 33.

    High: 33 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 20.

    Low: 20 °F

    Mostly Cloudy
    then Slight
    Chance Snow

Detailed Forecast

Tonight
Partly cloudy, with a low around 15. South wind 3 to 6 mph.
Wednesday
Increasing clouds, with a high near 36. South wind around 7 mph becoming northwest in the afternoon.
Wednesday Night
A 30 percent chance of snow, mainly between 9pm and midnight. Mostly cloudy, with a low around 9. North wind 6 to 10 mph.
Thursday
Mostly sunny and cold, with a high near 19. North wind 5 to 8 mph becoming calm in the afternoon.
Thursday Night
Partly cloudy, with a low around 6. Light and variable wind.
Friday
Mostly sunny, with a high near 33.
Friday Night
Mostly cloudy, with a low around 18.
Saturday
Partly sunny, with a high near 33.
Saturday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 20.
Sunday
A 20 percent chance of snow. Mostly cloudy, with a high near 31.
Sunday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 14.
Monday
Partly sunny, with a high near 31.
Monday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 23.
Tuesday
Partly sunny, with a high near 38.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Gillespie IL
 39.12°N 89.81°W (Elev. 653 ft)
Last Update:
3:16 pm CST Dec 2, 2025
Forecast Valid:
3pm CST Dec 2, 2025-6pm CST Dec 9, 2025
 
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