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

50°F

10°C

Humidity 94%
Wind Speed SE 10 mph
Barometer 29.93 in
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Wind Chill46°F (8°C)
Last update 24 Nov 6:50 pm CST
Extended Forecast for

Gillespie IL

  • Tonight

    Tonight: Rain, mainly before 5am. Patchy fog after 9pm. Low around 49. Southeast wind 5 to 10 mph becoming southwest after midnight. Chance of precipitation is 100%.

    Low: 49 °F

    Rain and
    Patchy Fog

  • Tuesday

    Tuesday: Patchy fog before noon. Otherwise, cloudy, with a high near 57. Light southwest wind becoming west 5 to 10 mph in the morning.

    High: 57 °F

    Patchy Fog
    then Cloudy

  • Tuesday Night

    Tuesday Night: A 20 percent chance of rain before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 33. Breezy, with a west wind 8 to 13 mph increasing to 16 to 21 mph after midnight. Winds could gust as high as 34 mph.

    Low: 33 °F

    Slight Chance
    Rain then
    Increasing
    Clouds and
    Breezy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 43. Breezy, with a west wind 14 to 22 mph, with gusts as high as 32 mph.

    High: 43 °F

    Mostly Sunny
    and Breezy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 23. West wind 7 to 10 mph.

    Low: 23 °F

    Partly Cloudy

  • Thanksgiving Day

    Thanksgiving Day: Sunny, with a high near 38.

    High: 38 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 18.

    Low: 18 °F

    Mostly Clear

  • Friday

    Friday: Partly sunny, with a high near 37.

    High: 37 °F

    Partly Sunny

  • Friday Night

    Friday Night: Snow likely, mainly after midnight. Cloudy, with a low around 27. Chance of precipitation is 70%.

    Low: 27 °F

    Chance Snow
    then Snow
    Likely

Detailed Forecast

Tonight
Rain, mainly before 5am. Patchy fog after 9pm. Low around 49. Southeast wind 5 to 10 mph becoming southwest after midnight. Chance of precipitation is 100%.
Tuesday
Patchy fog before noon. Otherwise, cloudy, with a high near 57. Light southwest wind becoming west 5 to 10 mph in the morning.
Tuesday Night
A 20 percent chance of rain before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 33. Breezy, with a west wind 8 to 13 mph increasing to 16 to 21 mph after midnight. Winds could gust as high as 34 mph.
Wednesday
Mostly sunny, with a high near 43. Breezy, with a west wind 14 to 22 mph, with gusts as high as 32 mph.
Wednesday Night
Partly cloudy, with a low around 23. West wind 7 to 10 mph.
Thanksgiving Day
Sunny, with a high near 38.
Thursday Night
Mostly clear, with a low around 18.
Friday
Partly sunny, with a high near 37.
Friday Night
Snow likely, mainly after midnight. Cloudy, with a low around 27. Chance of precipitation is 70%.
Saturday
Rain likely, possibly mixed with snow. Cloudy, with a high near 38. Chance of precipitation is 70%.
Saturday Night
A 50 percent chance of rain. Cloudy, with a low around 29.
Sunday
A 50 percent chance of rain. Mostly cloudy, with a high near 42.
Sunday Night
A 50 percent chance of rain. Cloudy, with a low around 29.
Monday
A 40 percent chance of rain. Mostly cloudy, with a high near 43.
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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:
7:36 pm CST Nov 24, 2025
Forecast Valid:
7pm CST Nov 24, 2025-6pm CST Dec 1, 2025
 
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