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

59°F

15°C

Humidity 23%
Wind Speed NW 16 G 23 mph
Barometer 29.96 in
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Last update 13 Mar 4:50 pm CDT
Extended Forecast for

Gillespie IL

  • Tonight

    Tonight: Partly cloudy, with a low around 33. Northwest wind 6 to 11 mph becoming light and variable.

    Low: 33 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 59. East wind 7 to 15 mph, with gusts as high as 22 mph.

    High: 59 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 50. Southeast wind 11 to 17 mph, with gusts as high as 25 mph.

    Low: 50 °F

    Mostly Cloudy

  • Sunday

    Sunday: Rain, mainly between 1pm and 4pm, then showers and possibly a thunderstorm after 4pm. High near 66. Breezy, with a south wind 21 to 28 mph, with gusts as high as 40 mph. Chance of precipitation is 80%.

    High: 66 °F

    Breezy.
    Chance Rain
    then Showers

  • Sunday Night

    Sunday Night: Rain before 10pm, then snow, possibly mixed with rain between 10pm and 1am, then a chance of snow after 1am. Some thunder is also possible. Low around 20. Breezy, with a west wind 23 to 28 mph, with gusts as high as 44 mph. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.

    Low: 20 °F

    Rain/Snow and
    Breezy

  • Monday

    Monday: A 40 percent chance of snow before 1pm. Mostly cloudy, with a high near 25. Blustery.

    High: 25 °F

    Chance Snow
    and Blustery

  • Monday Night

    Monday Night: Partly cloudy, with a low around 10. Blustery.

    Low: 10 °F

    Partly Cloudy
    and Blustery
    then Mostly
    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 33.

    High: 33 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of snow before 1am, then a chance of rain and snow. Mostly cloudy, with a low around 25. Chance of precipitation is 30%.

    Low: 25 °F

    Slight Chance
    Snow then
    Chance
    Rain/Snow

Detailed Forecast

Tonight
Partly cloudy, with a low around 33. Northwest wind 6 to 11 mph becoming light and variable.
Saturday
Mostly sunny, with a high near 59. East wind 7 to 15 mph, with gusts as high as 22 mph.
Saturday Night
Mostly cloudy, with a low around 50. Southeast wind 11 to 17 mph, with gusts as high as 25 mph.
Sunday
Rain, mainly between 1pm and 4pm, then showers and possibly a thunderstorm after 4pm. High near 66. Breezy, with a south wind 21 to 28 mph, with gusts as high as 40 mph. Chance of precipitation is 80%.
Sunday Night
Rain before 10pm, then snow, possibly mixed with rain between 10pm and 1am, then a chance of snow after 1am. Some thunder is also possible. Low around 20. Breezy, with a west wind 23 to 28 mph, with gusts as high as 44 mph. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.
Monday
A 40 percent chance of snow before 1pm. Mostly cloudy, with a high near 25. Blustery.
Monday Night
Partly cloudy, with a low around 10. Blustery.
Tuesday
Sunny, with a high near 33.
Tuesday Night
A slight chance of snow before 1am, then a chance of rain and snow. Mostly cloudy, with a low around 25. Chance of precipitation is 30%.
Wednesday
Mostly sunny, with a high near 58.
Wednesday Night
Mostly clear, with a low around 36.
Thursday
Mostly sunny, with a high near 64.
Thursday Night
Mostly clear, with a low around 42.
Friday
Sunny, with a high near 64.
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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:
4:41 pm CDT Mar 13, 2026
Forecast Valid:
5pm CDT Mar 13, 2026-6pm CDT Mar 20, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation