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

25°F

-4°C

Humidity 80%
Wind Speed W 7 mph
Barometer 30.10 in
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill17°F (-8°C)
Last update 2 Dec 2:50 pm CST
Extended Forecast for

Troy ILSimilar City Names

  • Tonight

    Tonight: Partly cloudy, with a low around 17. Calm wind becoming south around 6 mph in the evening.

    Low: 17 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Increasing clouds, with a high near 40. South wind around 7 mph becoming northwest in the afternoon.

    High: 40 °F

    Increasing
    Clouds

  • Wednesday Night

    Wednesday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 15. North wind 6 to 11 mph.

    Low: 15 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Thursday

    Thursday: Mostly sunny, with a high near 23. North wind 5 to 9 mph becoming light in the afternoon.

    High: 23 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 12. Light and variable wind.

    Low: 12 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 36.

    High: 36 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 22.

    Low: 22 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 37.

    High: 37 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 24.

    Low: 24 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 17. Calm wind becoming south around 6 mph in the evening.
Wednesday
Increasing clouds, with a high near 40. South wind around 7 mph becoming northwest in the afternoon.
Wednesday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 15. North wind 6 to 11 mph.
Thursday
Mostly sunny, with a high near 23. North wind 5 to 9 mph becoming light in the afternoon.
Thursday Night
Partly cloudy, with a low around 12. Light and variable wind.
Friday
Mostly sunny, with a high near 36.
Friday Night
Mostly cloudy, with a low around 22.
Saturday
Partly sunny, with a high near 37.
Saturday Night
Mostly cloudy, with a low around 24.
Sunday
A slight chance of rain and snow after noon. Mostly cloudy, with a high near 34. Chance of precipitation is 20%.
Sunday Night
A slight chance of rain and snow. Mostly cloudy, with a low around 18. Chance of precipitation is 20%.
Monday
Partly sunny, with a high near 33.
Monday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 26.
Tuesday
Partly sunny, with a high near 41.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Troy ILSimilar City Names
 38.72°N 89.89°W (Elev. 551 ft)
Last Update:
3:16 pm CST Dec 2, 2025
Forecast Valid:
3pm CST Dec 2, 2025-6pm CST Dec 9, 2025
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation