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.

Mostly Cloudy

37°F

3°C

Humidity 93%
Wind Speed Calm
Barometer 30.04 in
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Last update 10 Jan 4:15 am CST
Extended Forecast for

Troy ILSimilar City Names

  • Today

    Today: A 40 percent chance of rain, mainly before 9am. Cloudy through mid morning, then gradual clearing, with a high near 47. Light northwest wind increasing to 13 to 18 mph in the morning. Winds could gust as high as 25 mph.

    High: 47 °F

    Chance Rain
    then Sunny

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming clear, with a low around 26. West wind 9 to 17 mph, with gusts as high as 28 mph.

    Low: 26 °F

    Decreasing
    Clouds

  • Sunday

    Sunday: Sunny, with a high near 38. Northwest wind 12 to 17 mph decreasing to 6 to 11 mph in the afternoon. Winds could gust as high as 25 mph.

    High: 38 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 26. Calm wind becoming southwest 5 to 7 mph after midnight.

    Low: 26 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 51. West wind 7 to 10 mph.

    High: 51 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 37.

    Low: 37 °F

    Mostly Clear

  • Tuesday

    Tuesday: Partly sunny, with a high near 59.

    High: 59 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 38.

    Low: 38 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 20 percent chance of rain after noon. Mostly cloudy, with a high near 44.

    High: 44 °F

    Mostly Cloudy
    then Slight
    Chance Rain

Detailed Forecast

Today
A 40 percent chance of rain, mainly before 9am. Cloudy through mid morning, then gradual clearing, with a high near 47. Light northwest wind increasing to 13 to 18 mph in the morning. Winds could gust as high as 25 mph.
Tonight
Mostly cloudy, then gradually becoming clear, with a low around 26. West wind 9 to 17 mph, with gusts as high as 28 mph.
Sunday
Sunny, with a high near 38. Northwest wind 12 to 17 mph decreasing to 6 to 11 mph in the afternoon. Winds could gust as high as 25 mph.
Sunday Night
Mostly clear, with a low around 26. Calm wind becoming southwest 5 to 7 mph after midnight.
Monday
Mostly sunny, with a high near 51. West wind 7 to 10 mph.
Monday Night
Mostly clear, with a low around 37.
Tuesday
Partly sunny, with a high near 59.
Tuesday Night
Mostly cloudy, with a low around 38.
Wednesday
A 20 percent chance of rain after noon. Mostly cloudy, with a high near 44.
Wednesday Night
Partly cloudy, with a low around 21.
Thursday
Mostly sunny, with a high near 37.
Thursday Night
Mostly cloudy, with a low around 27.
Friday
Partly sunny, with a high near 43.
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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 am CST Jan 10, 2026
Forecast Valid:
4am CST Jan 10, 2026-6pm CST Jan 16, 2026
 
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Additional Resources

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Chance of Precipitation