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

45°F

7°C

Humidity 76%
Wind Speed W 15 G 21 mph
Barometer 30.02 in
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill38°F (3°C)
Last update 9 Jan 8:50 am CST
Extended Forecast for

Troy ILSimilar City Names

  • Today

    Today: Mostly cloudy, with a high near 50. West wind 6 to 14 mph becoming north in the afternoon. Winds could gust as high as 23 mph.

    High: 50 °F

    Mostly Cloudy

  • Tonight

    Tonight: A 20 percent chance of rain after 4am. Mostly cloudy, with a low around 36. Calm wind becoming northwest around 6 mph after midnight.

    Low: 36 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Saturday

    Saturday: A 20 percent chance of rain before 8am. Cloudy through mid morning, then gradual clearing, with a high near 46. Northwest wind 7 to 16 mph, with gusts as high as 24 mph.

    High: 46 °F

    Slight Chance
    Rain then
    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 24. Northwest wind 11 to 17 mph, with gusts as high as 25 mph.

    Low: 24 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 36. Northwest wind 7 to 17 mph, with gusts as high as 25 mph.

    High: 36 °F

    Sunny

  • Sunday Night

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

    Low: 25 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 51.

    High: 51 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 37.

    Low: 37 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 56.

    High: 56 °F

    Partly Sunny

Detailed Forecast

Today
Mostly cloudy, with a high near 50. West wind 6 to 14 mph becoming north in the afternoon. Winds could gust as high as 23 mph.
Tonight
A 20 percent chance of rain after 4am. Mostly cloudy, with a low around 36. Calm wind becoming northwest around 6 mph after midnight.
Saturday
A 20 percent chance of rain before 8am. Cloudy through mid morning, then gradual clearing, with a high near 46. Northwest wind 7 to 16 mph, with gusts as high as 24 mph.
Saturday Night
Partly cloudy, with a low around 24. Northwest wind 11 to 17 mph, with gusts as high as 25 mph.
Sunday
Sunny, with a high near 36. Northwest wind 7 to 17 mph, with gusts as high as 25 mph.
Sunday Night
Mostly clear, with a low around 25.
Monday
Sunny, with a high near 51.
Monday Night
Partly cloudy, with a low around 37.
Tuesday
Partly sunny, with a high near 56.
Tuesday Night
A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 36.
Wednesday
A 20 percent chance of rain. Mostly cloudy, with a high near 43.
Wednesday Night
Mostly cloudy, with a low around 24.
Thursday
Mostly sunny, with a high near 38.
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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:
6:21 am CST Jan 9, 2026
Forecast Valid:
8am CST Jan 9, 2026-6pm CST Jan 15, 2026
 
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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