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

56°F

13°C

Humidity 93%
Wind Speed NA
Barometer 30.09 in
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 5 Oct 3:35 am CDT
Extended Forecast for

Gillespie IL

  • Overnight

    Overnight: Clear, with a low around 57. South wind around 6 mph.

    Low: 57 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 87. South wind 6 to 14 mph, with gusts as high as 21 mph.

    High: 87 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 61. South wind around 7 mph.

    Low: 61 °F

    Mostly Clear

  • Monday

    Monday: A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly sunny, with a high near 85. South wind 5 to 7 mph. Chance of precipitation is 30%.

    High: 85 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63. South wind around 6 mph becoming calm in the evening.

    Low: 63 °F

    Chance
    T-storms then
    Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers and thunderstorms. Partly sunny, with a high near 76. Chance of precipitation is 30%.

    High: 76 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 52.

    Low: 52 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 74.

    High: 74 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 49.

    Low: 49 °F

    Mostly Clear

Detailed Forecast

Overnight
Clear, with a low around 57. South wind around 6 mph.
Sunday
Sunny, with a high near 87. South wind 6 to 14 mph, with gusts as high as 21 mph.
Sunday Night
Mostly clear, with a low around 61. South wind around 7 mph.
Monday
A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly sunny, with a high near 85. South wind 5 to 7 mph. Chance of precipitation is 30%.
Monday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63. South wind around 6 mph becoming calm in the evening.
Tuesday
A chance of showers and thunderstorms. Partly sunny, with a high near 76. Chance of precipitation is 30%.
Tuesday Night
Partly cloudy, with a low around 52.
Wednesday
Sunny, with a high near 74.
Wednesday Night
Mostly clear, with a low around 49.
Thursday
Sunny, with a high near 75.
Thursday Night
Mostly clear, with a low around 49.
Friday
Sunny, with a high near 79.
Friday Night
Mostly clear, with a low around 53.
Saturday
Sunny, with a high near 79.
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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 CDT Oct 5, 2025
Forecast Valid:
3am CDT Oct 5, 2025-6pm CDT Oct 11, 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