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

77°F

25°C

Humidity 65%
Wind Speed SW 6 mph
Barometer 30.11 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 24 Jun 9:50 am CDT
Extended Forecast for

Gillespie IL

  • Today

    Today: A 30 percent chance of showers and thunderstorms, mainly after 5pm. Partly sunny, with a high near 81. Southwest wind around 8 mph.

    High: 81 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly before 7pm. Mostly cloudy, with a low around 63. Southwest wind around 5 mph becoming calm in the evening.

    Low: 63 °F

    Chance
    T-storms

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms, mainly after 5pm. Cloudy, then gradually becoming mostly sunny, with a high near 84. Light and variable wind.

    High: 84 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Thursday Night

    Thursday Night: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 1am. Low around 65. Calm wind becoming southeast around 5 mph after midnight. Chance of precipitation is 80%.

    Low: 65 °F

    T-storms

  • Friday

    Friday: Showers and possibly a thunderstorm. High near 80. South wind around 7 mph. Chance of precipitation is 90%.

    High: 80 °F

    T-storms

  • Friday Night

    Friday Night: Showers and thunderstorms likely, mainly before 1am. Mostly cloudy, with a low around 66. Chance of precipitation is 70%.

    Low: 66 °F

    T-storms
    Likely

  • Saturday

    Saturday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 84.

    High: 84 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69.

    Low: 69 °F

    Chance
    T-storms

  • Sunday

    Sunday: Mostly sunny, with a high near 91.

    High: 91 °F

    Mostly Sunny

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms, mainly after 5pm. Partly sunny, with a high near 81. Southwest wind around 8 mph.
Tonight
A 30 percent chance of showers and thunderstorms, mainly before 7pm. Mostly cloudy, with a low around 63. Southwest wind around 5 mph becoming calm in the evening.
Thursday
A 30 percent chance of showers and thunderstorms, mainly after 5pm. Cloudy, then gradually becoming mostly sunny, with a high near 84. Light and variable wind.
Thursday Night
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 1am. Low around 65. Calm wind becoming southeast around 5 mph after midnight. Chance of precipitation is 80%.
Friday
Showers and possibly a thunderstorm. High near 80. South wind around 7 mph. Chance of precipitation is 90%.
Friday Night
Showers and thunderstorms likely, mainly before 1am. Mostly cloudy, with a low around 66. Chance of precipitation is 70%.
Saturday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 84.
Saturday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69.
Sunday
Mostly sunny, with a high near 91.
Sunday Night
Clear, with a low around 73.
Monday
Sunny, with a high near 93.
Monday Night
Clear, with a low around 74.
Tuesday
Sunny, with a high near 94.
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 am CDT Jun 24, 2026
Forecast Valid:
10am CDT Jun 24, 2026-6pm CDT Jun 30, 2026
 
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