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.

Overcast and Breezy

73°F

23°C

Humidity 47%
Wind Speed S 23 G 38 mph
Barometer 29.88 in
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Last update 12 Apr 7:50 pm CDT
Extended Forecast for

Gillespie IL

  • Tonight

    Tonight: A 50 percent chance of showers, mainly before 1am. Mostly cloudy, with a low around 64. Breezy, with a southwest wind 13 to 20 mph, with gusts as high as 29 mph.

    Low: 64 °F

    Chance
    Showers and
    Breezy

  • Monday

    Monday: Partly sunny, with a high near 83. South wind 10 to 18 mph, with gusts as high as 25 mph.

    High: 83 °F

    Partly Sunny

  • Monday Night

    Monday Night: A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Partly cloudy, with a low around 65. South wind 13 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 20%.

    Low: 65 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 85. South wind 11 to 18 mph, with gusts as high as 25 mph.

    High: 85 °F

    Partly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66. South wind 11 to 15 mph, with gusts as high as 23 mph.

    Low: 66 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. High near 79. Chance of precipitation is 80%.

    High: 79 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 60. Chance of precipitation is 60%.

    Low: 60 °F

    Showers
    Likely

  • Thursday

    Thursday: A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 81.

    High: 81 °F

    Slight Chance
    Showers

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 59.

    Low: 59 °F

    Mostly Clear

Detailed Forecast

Tonight
A 50 percent chance of showers, mainly before 1am. Mostly cloudy, with a low around 64. Breezy, with a southwest wind 13 to 20 mph, with gusts as high as 29 mph.
Monday
Partly sunny, with a high near 83. South wind 10 to 18 mph, with gusts as high as 25 mph.
Monday Night
A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Partly cloudy, with a low around 65. South wind 13 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 20%.
Tuesday
A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 85. South wind 11 to 18 mph, with gusts as high as 25 mph.
Tuesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66. South wind 11 to 15 mph, with gusts as high as 23 mph.
Wednesday
Showers and possibly a thunderstorm. High near 79. Chance of precipitation is 80%.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 60. Chance of precipitation is 60%.
Thursday
A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 81.
Thursday Night
Mostly clear, with a low around 59.
Friday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 85.
Friday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 61. Chance of precipitation is 60%.
Saturday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 76. Chance of precipitation is 60%.
Saturday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 41.
Sunday
Mostly sunny, with a high near 60.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Gillespie IL
 39.12°N 89.81°W (Elev. 653 ft)
Last Update:
6:35 pm CDT Apr 12, 2026
Forecast Valid:
8pm CDT Apr 12, 2026-6pm CDT Apr 19, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation