National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Mostly Cloudy and Windy

63°F

17°C

Humidity 49%
Wind Speed N 26 G 43 mph
Barometer 29.82 in
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Last update 22 Mar 5:50 pm CDT
Extended Forecast for

Gillespie IL

  • Tonight

    Tonight: Mostly cloudy during the early evening, then gradual clearing, with a low around 33. Breezy, with a north wind 21 to 26 mph decreasing to 15 to 20 mph after midnight. Winds could gust as high as 38 mph.

    Low: 33 °F

    Decreasing
    Clouds and
    Breezy then
    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 53. Northeast wind 8 to 16 mph, with gusts as high as 26 mph.

    High: 53 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 35. East wind around 6 mph.

    Low: 35 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 60. Southeast wind 6 to 9 mph.

    High: 60 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 40. South wind around 6 mph.

    Low: 40 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 73.

    High: 73 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 57.

    Low: 57 °F

    Partly Cloudy

  • Thursday

    Thursday: A 20 percent chance of rain and thunderstorms after 1pm. Sunny, with a high near 85.

    High: 85 °F

    Sunny then
    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: Rain likely and possibly a thunderstorm. Mostly cloudy, with a low around 39. Chance of precipitation is 60%.

    Low: 39 °F

    Rain Likely

Detailed Forecast

Tonight
Mostly cloudy during the early evening, then gradual clearing, with a low around 33. Breezy, with a north wind 21 to 26 mph decreasing to 15 to 20 mph after midnight. Winds could gust as high as 38 mph.
Monday
Mostly sunny, with a high near 53. Northeast wind 8 to 16 mph, with gusts as high as 26 mph.
Monday Night
Mostly cloudy, with a low around 35. East wind around 6 mph.
Tuesday
Mostly sunny, with a high near 60. Southeast wind 6 to 9 mph.
Tuesday Night
Mostly cloudy, with a low around 40. South wind around 6 mph.
Wednesday
Mostly sunny, with a high near 73.
Wednesday Night
Partly cloudy, with a low around 57.
Thursday
A 20 percent chance of rain and thunderstorms after 1pm. Sunny, with a high near 85.
Thursday Night
Rain likely and possibly a thunderstorm. Mostly cloudy, with a low around 39. Chance of precipitation is 60%.
Friday
A 40 percent chance of rain, mainly before 1pm. Partly sunny, with a high near 48.
Friday Night
Partly cloudy, with a low around 29.
Saturday
Sunny, with a high near 55.
Saturday Night
Partly cloudy, with a low around 36.
Sunday
Mostly sunny, with a high near 62.
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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:
5:46 pm CDT Mar 22, 2026
Forecast Valid:
6pm CDT Mar 22, 2026-6pm CDT Mar 29, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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