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

45°F

7°C

Humidity 53%
Wind Speed E 9 mph
Barometer 30.19 in
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Wind Chill40°F (4°C)
Last update 12 Feb 7:45 pm CST
Extended Forecast for

Gillespie IL

  • Tonight

    Tonight: Partly cloudy, with a low around 30. Southeast wind around 7 mph.

    Low: 30 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 56. South wind 6 to 10 mph.

    High: 56 °F

    Sunny

  • Friday Night

    Friday Night: Increasing clouds, with a low around 35. South wind around 6 mph becoming calm after midnight.

    Low: 35 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Rain likely, mainly after noon. Cloudy, with a high near 51. Calm wind becoming southeast 5 to 7 mph in the morning. Chance of precipitation is 60%.

    High: 51 °F

    Slight Chance
    Rain then
    Rain Likely

  • Saturday Night

    Saturday Night: Rain. Low around 42. East wind around 7 mph. Chance of precipitation is 80%.

    Low: 42 °F

    Rain

  • Sunday

    Sunday: Mostly sunny, with a high near 57.

    High: 57 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 34.

    Low: 34 °F

    Mostly Clear

  • Washington's Birthday

    Washington's Birthday: Mostly sunny, with a high near 59.

    High: 59 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 42.

    Low: 42 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 30. Southeast wind around 7 mph.
Friday
Sunny, with a high near 56. South wind 6 to 10 mph.
Friday Night
Increasing clouds, with a low around 35. South wind around 6 mph becoming calm after midnight.
Saturday
Rain likely, mainly after noon. Cloudy, with a high near 51. Calm wind becoming southeast 5 to 7 mph in the morning. Chance of precipitation is 60%.
Saturday Night
Rain. Low around 42. East wind around 7 mph. Chance of precipitation is 80%.
Sunday
Mostly sunny, with a high near 57.
Sunday Night
Mostly clear, with a low around 34.
Washington's Birthday
Mostly sunny, with a high near 59.
Monday Night
Mostly cloudy, with a low around 42.
Tuesday
Mostly cloudy, with a high near 62.
Tuesday Night
Mostly cloudy, with a low around 53.
Wednesday
Partly sunny, with a high near 67.
Wednesday Night
A 20 percent chance of rain. Partly cloudy, with a low around 42.
Thursday
A 20 percent chance of rain. Mostly sunny, with a high near 58.
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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:
7:26 pm CST Feb 12, 2026
Forecast Valid:
8pm CST Feb 12, 2026-6pm CST Feb 19, 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