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

64°F

18°C

Humidity 40%
Wind Speed Vrbl 5 mph
Barometer 30.23 in
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Last update 20 Apr 4:50 pm CDT
Extended Forecast for

Gillespie IL

  • Tonight

    Tonight: Mostly clear, with a low around 49. Southeast wind 7 to 10 mph.

    Low: 49 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 77. Southwest wind 8 to 17 mph, with gusts as high as 24 mph.

    High: 77 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after 1am. Mostly clear, with a low around 55. Southwest wind 8 to 11 mph.

    Low: 55 °F

    Mostly Clear
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: Mostly sunny, with a high near 75. Southwest wind 6 to 9 mph.

    High: 75 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 55. South wind around 6 mph.

    Low: 55 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 79. Breezy.

    High: 79 °F

    Mostly Sunny
    then Mostly
    Sunny and
    Breezy

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 59. Chance of precipitation is 60%.

    Low: 59 °F

    Partly Cloudy
    then Showers
    Likely

  • Friday

    Friday: Showers and possibly a thunderstorm. High near 73. Chance of precipitation is 80%.

    High: 73 °F

    Showers

  • Friday Night

    Friday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 50. Chance of precipitation is 50%.

    Low: 50 °F

    Chance
    T-storms

Detailed Forecast

Tonight
Mostly clear, with a low around 49. Southeast wind 7 to 10 mph.
Tuesday
Sunny, with a high near 77. Southwest wind 8 to 17 mph, with gusts as high as 24 mph.
Tuesday Night
A 20 percent chance of showers after 1am. Mostly clear, with a low around 55. Southwest wind 8 to 11 mph.
Wednesday
Mostly sunny, with a high near 75. Southwest wind 6 to 9 mph.
Wednesday Night
Mostly clear, with a low around 55. South wind around 6 mph.
Thursday
Mostly sunny, with a high near 79. Breezy.
Thursday Night
Showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 59. Chance of precipitation is 60%.
Friday
Showers and possibly a thunderstorm. High near 73. Chance of precipitation is 80%.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 50. Chance of precipitation is 50%.
Saturday
A 20 percent chance of showers. Mostly sunny, with a high near 71.
Saturday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 49.
Sunday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 69.
Sunday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 51.
Monday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 69.
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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:
2:56 pm CDT Apr 20, 2026
Forecast Valid:
5pm CDT Apr 20, 2026-6pm CDT Apr 27, 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