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.

Fog/Mist

16°F

-9°C

Humidity 89%
Wind Speed E 5 mph
Barometer 30.07 in
Dewpoint 13°F (-11°C)
Visibility 1.75 mi
Wind Chill8°F (-13°C)
Last update 3 Dec 3:15 am CST
Extended Forecast for

Gillespie IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 18. South wind around 8 mph.

    Low: 18 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 50 percent chance of snow, mainly after 4pm. Mostly cloudy, with a high near 35. South wind 5 to 10 mph becoming west in the afternoon.

    High: 35 °F

    Mostly Cloudy
    then Chance
    Snow

  • Wednesday Night

    Wednesday Night: Snow likely before 2am, then a chance of flurries between 2am and 3am. Cloudy, with a low around 9. North wind 5 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    Low: 9 °F

    Snow Likely
    then Slight
    Chance Snow

  • Thursday

    Thursday: 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 4. Light and variable wind.

    Low: 4 °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: Mostly cloudy, with a low around 20.

    Low: 20 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 18. South wind around 8 mph.
Wednesday
A 50 percent chance of snow, mainly after 4pm. Mostly cloudy, with a high near 35. South wind 5 to 10 mph becoming west in the afternoon.
Wednesday Night
Snow likely before 2am, then a chance of flurries between 2am and 3am. Cloudy, with a low around 9. North wind 5 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Thursday
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 4. 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
Mostly cloudy, with a low around 20.
Sunday
A slight chance of rain and snow after noon. Mostly cloudy, with a high near 32. Chance of precipitation is 20%.
Sunday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 18.
Monday
Partly sunny, with a high near 31.
Monday Night
Mostly cloudy, with a low around 23.
Tuesday
Partly sunny, with a high near 39.
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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:
3:15 am CST Dec 3, 2025
Forecast Valid:
3am CST Dec 3, 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