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

38°F

3°C

Humidity 79%
Wind Speed S 6 mph
Barometer 29.94 in
Dewpoint 33°F (1°C)
Visibility 10.00 mi
Wind Chill33°F (1°C)
Last update 6 Dec 11:15 pm CST
Extended Forecast for

Gillespie IL

  • Tonight

    Tonight: A 20 percent chance of rain. Cloudy, with a low around 32. South wind 6 to 9 mph.

    Low: 32 °F

    Slight Chance
    Rain

  • Sunday

    Sunday: A slight chance of drizzle before noon. Cloudy, with a high near 36. South wind 5 to 15 mph becoming north in the afternoon. Winds could gust as high as 24 mph.

    High: 36 °F

    Slight Chance
    Drizzle then
    Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 15. North wind 6 to 13 mph, with gusts as high as 22 mph.

    Low: 15 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, then gradually becoming sunny, with a high near 29. North wind around 6 mph becoming calm in the morning.

    High: 29 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Partly cloudy, with a low around 20. Light south wind increasing to 5 to 10 mph in the evening.

    Low: 20 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 46.

    High: 46 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of rain after midnight. Mostly cloudy, with a low around 36.

    Low: 36 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Wednesday

    Wednesday: Partly sunny, with a high near 44.

    High: 44 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A slight chance of rain and snow before midnight, then a chance of snow. Mostly cloudy, with a low around 24. Chance of precipitation is 30%.

    Low: 24 °F

    Slight Chance
    Rain/Snow
    then Chance
    Snow

Detailed Forecast

Tonight
A 20 percent chance of rain. Cloudy, with a low around 32. South wind 6 to 9 mph.
Sunday
A slight chance of drizzle before noon. Cloudy, with a high near 36. South wind 5 to 15 mph becoming north in the afternoon. Winds could gust as high as 24 mph.
Sunday Night
Mostly cloudy, with a low around 15. North wind 6 to 13 mph, with gusts as high as 22 mph.
Monday
Mostly cloudy, then gradually becoming sunny, with a high near 29. North wind around 6 mph becoming calm in the morning.
Monday Night
Partly cloudy, with a low around 20. Light south wind increasing to 5 to 10 mph in the evening.
Tuesday
Partly sunny, with a high near 46.
Tuesday Night
A 20 percent chance of rain after midnight. Mostly cloudy, with a low around 36.
Wednesday
Partly sunny, with a high near 44.
Wednesday Night
A slight chance of rain and snow before midnight, then a chance of snow. Mostly cloudy, with a low around 24. Chance of precipitation is 30%.
Thursday
A 30 percent chance of snow, mainly before noon. Mostly cloudy, with a high near 34.
Thursday Night
Mostly cloudy, with a low around 15.
Friday
Partly sunny, with a high near 23.
Friday Night
Mostly cloudy, with a low around 5.
Saturday
Mostly sunny and cold, with a high near 19.
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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:
9:46 pm CST Dec 6, 2025
Forecast Valid:
11pm CST Dec 6, 2025-6pm CST Dec 13, 2025
 
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