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

27°F

-3°C

Humidity 43%
Wind Speed NW 16 mph
Barometer 30.49 in
Dewpoint 7°F (-14°C)
Visibility 10.00 mi
Wind Chill15°F (-9°C)
Last update 22 Feb 7:50 pm CST
Extended Forecast for

Troy IL

  • Tonight

    Tonight: Increasing clouds, with a low around 15. Northwest wind 14 to 18 mph, with gusts as high as 31 mph.

    Low: 15 °F

    Increasing
    Clouds

  • Monday

    Monday: Partly sunny, then gradually becoming sunny, with a high near 31. Northwest wind 8 to 16 mph, with gusts as high as 25 mph.

    High: 31 °F

    Becoming
    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 20. Calm wind becoming south 5 to 9 mph after midnight.

    Low: 20 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 51. South wind 10 to 18 mph, with gusts as high as 28 mph.

    High: 51 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 34. Southwest wind 5 to 11 mph becoming west after midnight. Winds could gust as high as 20 mph.

    Low: 34 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 54.

    High: 54 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A chance of rain, then rain likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 36. Chance of precipitation is 60%.

    Low: 36 °F

    Rain Likely

  • Thursday

    Thursday: A 30 percent chance of rain before noon. Mostly sunny, with a high near 51.

    High: 51 °F

    Chance Rain
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 29.

    Low: 29 °F

    Mostly Clear

Detailed Forecast

Tonight
Increasing clouds, with a low around 15. Northwest wind 14 to 18 mph, with gusts as high as 31 mph.
Monday
Partly sunny, then gradually becoming sunny, with a high near 31. Northwest wind 8 to 16 mph, with gusts as high as 25 mph.
Monday Night
Mostly clear, with a low around 20. Calm wind becoming south 5 to 9 mph after midnight.
Tuesday
Mostly cloudy, with a high near 51. South wind 10 to 18 mph, with gusts as high as 28 mph.
Tuesday Night
Mostly cloudy, with a low around 34. Southwest wind 5 to 11 mph becoming west after midnight. Winds could gust as high as 20 mph.
Wednesday
Mostly sunny, with a high near 54.
Wednesday Night
A chance of rain, then rain likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 36. Chance of precipitation is 60%.
Thursday
A 30 percent chance of rain before noon. Mostly sunny, with a high near 51.
Thursday Night
Mostly clear, with a low around 29.
Friday
Sunny, with a high near 62.
Friday Night
Mostly clear, with a low around 38.
Saturday
Sunny, with a high near 63.
Saturday Night
Partly cloudy, with a low around 33.
Sunday
A 20 percent chance of rain. Partly sunny, with a high near 49.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Troy IL
 38.72°N 89.89°W (Elev. 551 ft)
Last Update:
7:16 pm CST Feb 22, 2026
Forecast Valid:
7pm CST Feb 22, 2026-6pm CST Mar 1, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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