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

23°F

-5°C

Humidity 74%
Wind Speed NW 12 mph
Barometer 30.49 in
Dewpoint 16°F (-9°C)
Visibility 10.00 mi
Wind Chill11°F (-12°C)
Last update 30 Nov 5:50 pm CST
Extended Forecast for

Gillespie IL

  • Tonight

    Tonight: Cloudy, with a low around 17. Northwest wind 5 to 8 mph becoming calm after midnight.

    Low: 17 °F

    Cloudy

  • Monday

    Monday: Snow likely, mainly after 5pm. Cloudy, with a high near 29. East wind 3 to 6 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

    High: 29 °F

    Cloudy then
    Snow Likely

  • Monday Night

    Monday Night: Snow, mainly before 1am. Low around 17. Calm wind becoming northwest 5 to 7 mph after midnight. Chance of precipitation is 90%. New snow accumulation of 1 to 2 inches possible.

    Low: 17 °F

    Snow then
    Snow Likely

  • Tuesday

    Tuesday: Partly sunny, with a high near 28. West wind around 6 mph becoming calm in the afternoon.

    High: 28 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 16. Calm wind becoming south around 6 mph after midnight.

    Low: 16 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 35.

    High: 35 °F

    Partly Sunny

  • Wednesday Night

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

    Low: 10 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny and cold, with a high near 18.

    High: 18 °F

    Cold

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 5.

    Low: 5 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Cloudy, with a low around 17. Northwest wind 5 to 8 mph becoming calm after midnight.
Monday
Snow likely, mainly after 5pm. Cloudy, with a high near 29. East wind 3 to 6 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.
Monday Night
Snow, mainly before 1am. Low around 17. Calm wind becoming northwest 5 to 7 mph after midnight. Chance of precipitation is 90%. New snow accumulation of 1 to 2 inches possible.
Tuesday
Partly sunny, with a high near 28. West wind around 6 mph becoming calm in the afternoon.
Tuesday Night
Partly cloudy, with a low around 16. Calm wind becoming south around 6 mph after midnight.
Wednesday
Partly sunny, with a high near 35.
Wednesday Night
Mostly cloudy, with a low around 10.
Thursday
Mostly sunny and cold, with a high near 18.
Thursday Night
Mostly cloudy, with a low around 5.
Friday
A 40 percent chance of snow. Mostly cloudy, with a high near 29.
Friday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 21.
Saturday
Mostly cloudy, with a high near 33.
Saturday Night
Mostly cloudy, with a low around 22.
Sunday
Mostly cloudy, with a high near 33.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Gillespie IL
 39.12°N 89.81°W (Elev. 653 ft)
Last Update:
4:51 pm CST Nov 30, 2025
Forecast Valid:
6pm CST Nov 30, 2025-6pm CST Dec 7, 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