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.

Fog/Mist

34°F

1°C

Humidity 87%
Wind Speed N 16 G 24 mph
Barometer 30.12 in
Dewpoint 30°F (-1°C)
Visibility 4.00 mi
Wind Chill24°F (-4°C)
Last update 7 Dec 1:50 pm CST
Extended Forecast for

Troy IL

  • This Afternoon

    This Afternoon: A slight chance of drizzle before 4pm, then a slight chance of drizzle after 5pm. Cloudy, with a high near 41. North wind 11 to 14 mph, with gusts as high as 21 mph.

    High: 41 °F

    Slight Chance
    Drizzle

  • Tonight

    Tonight: A 20 percent chance of snow before 10pm. Mostly cloudy, with a low around 22. North wind 6 to 13 mph.

    Low: 22 °F

    Slight Chance
    Snow then
    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, then gradually becoming sunny, with a high near 34. North wind around 6 mph becoming calm in the morning.

    High: 34 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Partly cloudy, with a low around 25. Light southeast wind becoming south 5 to 10 mph in the evening.

    Low: 25 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 51. South wind 10 to 14 mph, with gusts as high as 21 mph.

    High: 51 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 41.

    Low: 41 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 48.

    High: 48 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 27.

    Low: 27 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Thursday

    Thursday: A chance of rain and snow. Mostly cloudy, with a high near 37. Chance of precipitation is 30%.

    High: 37 °F

    Chance
    Rain/Snow

Detailed Forecast

This Afternoon
A slight chance of drizzle before 4pm, then a slight chance of drizzle after 5pm. Cloudy, with a high near 41. North wind 11 to 14 mph, with gusts as high as 21 mph.
Tonight
A 20 percent chance of snow before 10pm. Mostly cloudy, with a low around 22. North wind 6 to 13 mph.
Monday
Mostly cloudy, then gradually becoming sunny, with a high near 34. North wind around 6 mph becoming calm in the morning.
Monday Night
Partly cloudy, with a low around 25. Light southeast wind becoming south 5 to 10 mph in the evening.
Tuesday
Mostly sunny, with a high near 51. South wind 10 to 14 mph, with gusts as high as 21 mph.
Tuesday Night
Mostly cloudy, with a low around 41.
Wednesday
Partly sunny, with a high near 48.
Wednesday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 27.
Thursday
A chance of rain and snow. Mostly cloudy, with a high near 37. Chance of precipitation is 30%.
Thursday Night
A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 17.
Friday
Mostly sunny, with a high near 24.
Friday Night
Mostly cloudy, with a low around 6.
Saturday
Partly sunny, with a high near 21.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Troy IL
 38.72°N 89.89°W (Elev. 551 ft)
Last Update:
11:06 am CST Dec 7, 2025
Forecast Valid:
1pm CST Dec 7, 2025-6pm CST Dec 13, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation