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

43°F

6°C

Humidity 34%
Wind Speed NW 18 G 32 mph
Barometer 30.22 in
Dewpoint 16°F (-9°C)
Visibility 10.00 mi
Wind Chill35°F (2°C)
Last update 26 Nov 3:50 pm CST
Extended Forecast for

Gillespie IL

  • Tonight

    Tonight: Partly cloudy, with a low around 26. Northwest wind 8 to 15 mph, with gusts as high as 24 mph.

    Low: 26 °F

    Partly Cloudy

  • Thanksgiving Day

    Thanksgiving Day: Sunny, with a high near 39. Northwest wind 9 to 13 mph, with gusts as high as 20 mph.

    High: 39 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 18. Northwest wind 3 to 6 mph.

    Low: 18 °F

    Clear

  • Friday

    Friday: Increasing clouds, with a high near 36. Light and variable wind.

    High: 36 °F

    Increasing
    Clouds

  • Friday Night

    Friday Night: A 50 percent chance of snow after midnight. Cloudy, with a low around 27. Light southeast wind increasing to 6 to 11 mph in the evening.

    Low: 27 °F

    Mostly Cloudy
    then Chance
    Snow

  • Saturday

    Saturday: Snow before noon, then rain and snow. High near 37. Chance of precipitation is 90%. New snow accumulation of 2 to 4 inches possible.

    High: 37 °F

    Snow then
    Rain/Snow

  • Saturday Night

    Saturday Night: Rain likely, possibly mixed with snow, mainly before midnight. Cloudy, with a low around 23. Chance of precipitation is 70%.

    Low: 23 °F

    Rain/Snow
    Likely then
    Chance
    Rain/Snow

  • Sunday

    Sunday: Mostly cloudy, with a high near 30.

    High: 30 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 14.

    Low: 14 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 26. Northwest wind 8 to 15 mph, with gusts as high as 24 mph.
Thanksgiving Day
Sunny, with a high near 39. Northwest wind 9 to 13 mph, with gusts as high as 20 mph.
Thursday Night
Clear, with a low around 18. Northwest wind 3 to 6 mph.
Friday
Increasing clouds, with a high near 36. Light and variable wind.
Friday Night
A 50 percent chance of snow after midnight. Cloudy, with a low around 27. Light southeast wind increasing to 6 to 11 mph in the evening.
Saturday
Snow before noon, then rain and snow. High near 37. Chance of precipitation is 90%. New snow accumulation of 2 to 4 inches possible.
Saturday Night
Rain likely, possibly mixed with snow, mainly before midnight. Cloudy, with a low around 23. Chance of precipitation is 70%.
Sunday
Mostly cloudy, with a high near 30.
Sunday Night
Mostly cloudy, with a low around 14.
Monday
A 20 percent chance of snow. Mostly cloudy, with a high near 25.
Monday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 14.
Tuesday
Mostly sunny, with a high near 29.
Tuesday Night
Partly cloudy, with a low around 15.
Wednesday
Mostly sunny, with a high near 37.
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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 Nov 26, 2025
Forecast Valid:
4pm CST Nov 26, 2025-6pm CST Dec 3, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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