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

31°F

-1°C

Humidity 69%
Wind Speed W 6 mph
Barometer 30.06 in
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Wind Chill25°F (-4°C)
Last update 11 Dec 3:35 am CST
Extended Forecast for

Gillespie IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 22. Northwest wind 6 to 8 mph.

    Low: 22 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 40 percent chance of snow after 3pm. Mostly cloudy, with a high near 33. Light and variable wind becoming southeast 5 to 8 mph in the morning.

    High: 33 °F

    Mostly Cloudy
    then Chance
    Snow

  • Thursday Night

    Thursday Night: Snow likely, mainly before 8pm. Mostly cloudy, with a low around 28. Southeast wind 6 to 9 mph becoming north after midnight. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    Low: 28 °F

    Snow Likely
    then Slight
    Chance Snow

  • Friday

    Friday: Mostly cloudy, with a high near 34. North wind 8 to 11 mph.

    High: 34 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 17. Northwest wind around 8 mph.

    Low: 17 °F

    Mostly Cloudy

  • Saturday

    Saturday: Snow likely, mainly after noon. Cloudy, with a high near 21. Chance of precipitation is 60%. New snow accumulation of 1 to 2 inches possible.

    High: 21 °F

    Chance Snow
    then Snow
    Likely

  • Saturday Night

    Saturday Night: A 20 percent chance of snow before midnight. Partly cloudy, with a low around -4.

    Low: -4 °F

    Slight Chance
    Snow then
    Mostly Clear

  • Sunday

    Sunday: Sunny and cold, with a high near 9.

    High: 9 °F

    Cold

  • Sunday Night

    Sunday Night: Mostly clear, with a low around -1.

    Low: -1 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 22. Northwest wind 6 to 8 mph.
Thursday
A 40 percent chance of snow after 3pm. Mostly cloudy, with a high near 33. Light and variable wind becoming southeast 5 to 8 mph in the morning.
Thursday Night
Snow likely, mainly before 8pm. Mostly cloudy, with a low around 28. Southeast wind 6 to 9 mph becoming north after midnight. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Friday
Mostly cloudy, with a high near 34. North wind 8 to 11 mph.
Friday Night
Mostly cloudy, with a low around 17. Northwest wind around 8 mph.
Saturday
Snow likely, mainly after noon. Cloudy, with a high near 21. Chance of precipitation is 60%. New snow accumulation of 1 to 2 inches possible.
Saturday Night
A 20 percent chance of snow before midnight. Partly cloudy, with a low around -4.
Sunday
Sunny and cold, with a high near 9.
Sunday Night
Mostly clear, with a low around -1.
Monday
Sunny, with a high near 34.
Monday Night
Partly cloudy, with a low around 19.
Tuesday
Mostly sunny, with a high near 40.
Tuesday Night
Mostly cloudy, with a low around 32.
Wednesday
Mostly cloudy, with a high near 48.
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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 am CST Dec 11, 2025
Forecast Valid:
3am CST Dec 11, 2025-6pm CST Dec 17, 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