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

28°F

-2°C

Humidity 69%
Wind Speed S 10 mph
Barometer 30.31 in
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill19°F (-7°C)
Last update 12 Jan 7:45 am CST
Extended Forecast for

Gillespie IL

  • Today

    Today: Sunny, with a high near 50. Southwest wind 8 to 11 mph, with gusts as high as 20 mph.

    High: 50 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 33. Southwest wind 7 to 9 mph.

    Low: 33 °F

    Mostly Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 57. West wind 10 to 16 mph, with gusts as high as 28 mph.

    High: 57 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers before midnight. Mostly cloudy, with a low around 36. West wind 8 to 11 mph.

    Low: 36 °F

    Slight Chance
    Showers then
    Mostly Cloudy

  • Wednesday

    Wednesday: A slight chance of rain showers after noon, mixing with snow after 3pm. Mostly cloudy, with a temperature falling to around 29 by 5pm. Breezy, with a northwest wind 13 to 22 mph, with gusts as high as 30 mph. Chance of precipitation is 20%.

    High: 40 °F⇓

    Breezy.
    Mostly Cloudy
    then Slight
    Chance
    Rain/Snow

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 16.

    Low: 16 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 28.

    High: 28 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 24.

    Low: 24 °F

    Mostly Cloudy

  • Friday

    Friday: A 20 percent chance of snow showers after noon. Partly sunny, with a high near 39.

    High: 39 °F

    Partly Sunny
    then Slight
    Chance Snow
    Showers

Detailed Forecast

Today
Sunny, with a high near 50. Southwest wind 8 to 11 mph, with gusts as high as 20 mph.
Tonight
Mostly clear, with a low around 33. Southwest wind 7 to 9 mph.
Tuesday
Increasing clouds, with a high near 57. West wind 10 to 16 mph, with gusts as high as 28 mph.
Tuesday Night
A 20 percent chance of showers before midnight. Mostly cloudy, with a low around 36. West wind 8 to 11 mph.
Wednesday
A slight chance of rain showers after noon, mixing with snow after 3pm. Mostly cloudy, with a temperature falling to around 29 by 5pm. Breezy, with a northwest wind 13 to 22 mph, with gusts as high as 30 mph. Chance of precipitation is 20%.
Wednesday Night
Partly cloudy, with a low around 16.
Thursday
Sunny, with a high near 28.
Thursday Night
Mostly cloudy, with a low around 24.
Friday
A 20 percent chance of snow showers after noon. Partly sunny, with a high near 39.
Friday Night
Mostly cloudy, with a low around 17.
Saturday
Mostly cloudy, with a high near 26.
Saturday Night
Partly cloudy, with a low around 8.
Sunday
Mostly sunny, with a high near 25.
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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:
5:01 am CST Jan 12, 2026
Forecast Valid:
7am CST Jan 12, 2026-6pm CST Jan 18, 2026
 
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