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

79°F

26°C

Humidity 45%
Wind Speed E 5 mph
Barometer 30.05 in
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 10 Oct 1:50 pm CDT
Extended Forecast for

Gillespie IL

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 80. Southeast wind around 8 mph.

    High: 80 °F

    Partly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 50. Southeast wind around 6 mph becoming calm in the evening.

    Low: 50 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 86. Calm wind.

    High: 86 °F

    Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 60. Calm wind becoming south around 5 mph.

    Low: 60 °F

    Increasing
    Clouds

  • Columbus Day

    Columbus Day: Sunny, with a high near 93. Southwest wind 5 to 11 mph.

    High: 93 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 67.

    Low: 67 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 91.

    High: 91 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of showers and thunderstorms, then a chance of showers after 1am. Mostly clear, with a low around 65. Chance of precipitation is 40%.

    Low: 65 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 82. Chance of precipitation is 70%.

    High: 82 °F

    Showers
    Likely

Detailed Forecast

This Afternoon
Partly sunny, with a high near 80. Southeast wind around 8 mph.
Tonight
Partly cloudy, with a low around 50. Southeast wind around 6 mph becoming calm in the evening.
Sunday
Sunny, with a high near 86. Calm wind.
Sunday Night
Increasing clouds, with a low around 60. Calm wind becoming south around 5 mph.
Columbus Day
Sunny, with a high near 93. Southwest wind 5 to 11 mph.
Monday Night
Clear, with a low around 67.
Tuesday
Sunny, with a high near 91.
Tuesday Night
A slight chance of showers and thunderstorms, then a chance of showers after 1am. Mostly clear, with a low around 65. Chance of precipitation is 40%.
Wednesday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 82. Chance of precipitation is 70%.
Wednesday Night
Showers likely. Mostly cloudy, with a low around 60. Chance of precipitation is 60%.
Thursday
Showers and thunderstorms likely. Mostly cloudy, with a high near 76. Chance of precipitation is 60%.
Thursday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 52.
Friday
A 20 percent chance of showers. Partly sunny, with a high near 69.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Gillespie IL
 39.12°N 89.84°W (Elev. 673 ft)
Last Update:
1:26 pm CDT Oct 10, 2026
Forecast Valid:
2pm CDT Oct 10, 2026-6pm CDT Oct 16, 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