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

70°F

21°C

Humidity 17%
Wind Speed Calm
Barometer 29.64 in
Dewpoint 23°F (-5°C)
Visibility 10.00 mi
Last update 18 Feb 4:45 pm CST
Extended Forecast for

4 Miles SSW South Roxana IL

  • Tonight

    Tonight: Partly cloudy, with a low around 49. Light and variable wind becoming south around 6 mph after midnight.

    Low: 49 °F

    Partly Cloudy

  • Thursday

    Thursday: A 40 percent chance of rain and thunderstorms, mainly before 1pm. Partly sunny, with a high near 70. Southeast wind 6 to 11 mph becoming southwest 13 to 18 mph in the afternoon. Winds could gust as high as 26 mph.

    High: 70 °F

    Chance Rain
    then Chance
    T-storms

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 38. Southwest wind 10 to 18 mph, with gusts as high as 28 mph.

    Low: 38 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 50. West wind 8 to 18 mph, with gusts as high as 26 mph.

    High: 50 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 30. North wind around 6 mph.

    Low: 30 °F

    Partly Cloudy

  • Saturday

    Saturday: A slight chance of rain and snow after noon. Mostly sunny, with a high near 45. Chance of precipitation is 20%.

    High: 45 °F

    Mostly Sunny
    then Slight
    Chance
    Rain/Snow

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 25.

    Low: 25 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 39.

    High: 39 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 20.

    Low: 20 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 49. Light and variable wind becoming south around 6 mph after midnight.
Thursday
A 40 percent chance of rain and thunderstorms, mainly before 1pm. Partly sunny, with a high near 70. Southeast wind 6 to 11 mph becoming southwest 13 to 18 mph in the afternoon. Winds could gust as high as 26 mph.
Thursday Night
Mostly clear, with a low around 38. Southwest wind 10 to 18 mph, with gusts as high as 28 mph.
Friday
Sunny, with a high near 50. West wind 8 to 18 mph, with gusts as high as 26 mph.
Friday Night
Partly cloudy, with a low around 30. North wind around 6 mph.
Saturday
A slight chance of rain and snow after noon. Mostly sunny, with a high near 45. Chance of precipitation is 20%.
Saturday Night
Mostly clear, with a low around 25.
Sunday
Sunny, with a high near 39.
Sunday Night
Mostly clear, with a low around 20.
Monday
Sunny, with a high near 39.
Monday Night
Mostly clear, with a low around 22.
Tuesday
Mostly sunny, with a high near 49.
Tuesday Night
Mostly cloudy, with a low around 37.
Wednesday
A 20 percent chance of rain. Partly sunny, with a high near 57.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSW South Roxana IL
 38.77°N 90.08°W (Elev. 427 ft)
Last Update:
2:41 pm CST Feb 18, 2026
Forecast Valid:
5pm CST Feb 18, 2026-6pm CST Feb 25, 2026
 
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