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

25°F

-4°C

Humidity 80%
Wind Speed SE 6 mph
Barometer 30.21 in
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill18°F (-8°C)
Last update 8 Dec 8:50 pm CST
Extended Forecast for

Gillespie IL

  • Tonight

    Tonight: Clear early, then becoming cloudy, with a temperature rising to around 30 by 5am. South wind 7 to 13 mph, with gusts as high as 20 mph.

    Low: 23 °F⇑

    Becoming
    Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 45. South wind 11 to 15 mph, with gusts as high as 24 mph.

    High: 45 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of rain after midnight. Cloudy, then gradually becoming partly cloudy, with a low around 33. South wind 15 to 17 mph becoming west after midnight. Winds could gust as high as 30 mph.

    Low: 33 °F

    Cloudy then
    Slight Chance
    Rain

  • Wednesday

    Wednesday: Increasing clouds, with a temperature falling to around 34 by 5pm. Breezy, with a northwest wind 15 to 25 mph, with gusts as high as 41 mph.

    High: 42 °F⇓

    Increasing
    Clouds and
    Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 23. Northwest wind 5 to 10 mph.

    Low: 23 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 30 percent chance of snow, mainly before noon. Mostly cloudy, with a high near 35.

    High: 35 °F

    Chance Snow

  • Thursday Night

    Thursday Night: A 20 percent chance of snow. Mostly cloudy, with a low around 22.

    Low: 22 °F

    Slight Chance
    Snow

  • Friday

    Friday: A 20 percent chance of snow before noon. Mostly cloudy, with a high near 32.

    High: 32 °F

    Slight Chance
    Snow then
    Mostly Cloudy

  • Friday Night

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

    Low: 10 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Clear early, then becoming cloudy, with a temperature rising to around 30 by 5am. South wind 7 to 13 mph, with gusts as high as 20 mph.
Tuesday
Partly sunny, with a high near 45. South wind 11 to 15 mph, with gusts as high as 24 mph.
Tuesday Night
A 20 percent chance of rain after midnight. Cloudy, then gradually becoming partly cloudy, with a low around 33. South wind 15 to 17 mph becoming west after midnight. Winds could gust as high as 30 mph.
Wednesday
Increasing clouds, with a temperature falling to around 34 by 5pm. Breezy, with a northwest wind 15 to 25 mph, with gusts as high as 41 mph.
Wednesday Night
Mostly cloudy, with a low around 23. Northwest wind 5 to 10 mph.
Thursday
A 30 percent chance of snow, mainly before noon. Mostly cloudy, with a high near 35.
Thursday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 22.
Friday
A 20 percent chance of snow before noon. Mostly cloudy, with a high near 32.
Friday Night
Mostly cloudy, with a low around 10.
Saturday
Partly sunny and cold, with a high near 20.
Saturday Night
Mostly cloudy, with a low around 9.
Sunday
Mostly sunny, with a high near 25.
Sunday Night
Mostly cloudy, with a low around 15.
Monday
A slight chance of rain and snow. Mostly cloudy, with a high near 34. Chance of precipitation is 20%.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Gillespie IL
 39.12°N 89.81°W (Elev. 653 ft)
Last Update:
8:31 pm CST Dec 8, 2025
Forecast Valid:
9pm CST Dec 8, 2025-6pm CST Dec 15, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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