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

73°F

23°C

Humidity 65%
Wind Speed Vrbl 5 mph
Barometer 30.06 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 3 Aug 7:50 pm CDT
Extended Forecast for

Gillespie IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 61. Northeast wind 3 to 5 mph.

    Low: 61 °F

    Mostly Cloudy

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms, mainly after 3pm. Mostly cloudy, with a high near 78. East wind 5 to 7 mph.

    High: 78 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Monday Night

    Monday Night: A 30 percent chance of showers and thunderstorms before 7pm. Mostly cloudy, with a low around 64. East wind around 5 mph becoming calm in the evening.

    Low: 64 °F

    Chance
    T-storms then
    Partly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 82. Calm wind becoming east around 5 mph in the afternoon.

    High: 82 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 65. Light southeast wind.

    Low: 65 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 85.

    High: 85 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 86.

    High: 86 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 68.

    Low: 68 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 61. Northeast wind 3 to 5 mph.
Monday
A 30 percent chance of showers and thunderstorms, mainly after 3pm. Mostly cloudy, with a high near 78. East wind 5 to 7 mph.
Monday Night
A 30 percent chance of showers and thunderstorms before 7pm. Mostly cloudy, with a low around 64. East wind around 5 mph becoming calm in the evening.
Tuesday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 82. Calm wind becoming east around 5 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 65. Light southeast wind.
Wednesday
Sunny, with a high near 85.
Wednesday Night
Mostly clear, with a low around 66.
Thursday
Sunny, with a high near 86.
Thursday Night
Mostly clear, with a low around 68.
Friday
Sunny, with a high near 88.
Friday Night
Mostly clear, with a low around 70.
Saturday
Sunny, with a high near 89.
Saturday Night
Mostly clear, with a low around 70.
Sunday
Sunny, with a high near 89.
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:
6:06 pm CDT Aug 3, 2025
Forecast Valid:
8pm CDT Aug 3, 2025-6pm CDT Aug 10, 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