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

48°F

9°C

Humidity 82%
Wind Speed S 13 mph
Barometer 29.87 in
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Wind Chill43°F (6°C)
Last update 9 Mar 6:50 am CDT
Extended Forecast for

Troy ILSimilar City Names

  • Today

    Today: Sunny, with a high near 79. South wind 8 to 16 mph, with gusts as high as 24 mph.

    High: 79 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 60. South wind 8 to 13 mph, with gusts as high as 21 mph.

    Low: 60 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 40 percent chance of showers after 4pm. Increasing clouds, with a high near 81. South wind 7 to 16 mph, with gusts as high as 23 mph.

    High: 81 °F

    Mostly Sunny
    then Chance
    Showers

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7pm. Low around 55. Southwest wind around 15 mph, with gusts as high as 24 mph. Chance of precipitation is 90%.

    Low: 55 °F

    Showers
    Likely then
    Showers

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. Temperature rising to near 64 by 10am, then falling to around 49 during the remainder of the day. Breezy, with a southwest wind 14 to 21 mph becoming northwest in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 100%.

    High: 64 °F⇓

    Showers and
    Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 33. Breezy.

    Low: 33 °F

    Mostly Cloudy
    and Breezy
    then Partly
    Cloudy

  • Thursday

    Thursday: Sunny, with a high near 53.

    High: 53 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 44.

    Low: 44 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 63.

    High: 63 °F

    Partly Sunny

Detailed Forecast

Today
Sunny, with a high near 79. South wind 8 to 16 mph, with gusts as high as 24 mph.
Tonight
Mostly clear, with a low around 60. South wind 8 to 13 mph, with gusts as high as 21 mph.
Tuesday
A 40 percent chance of showers after 4pm. Increasing clouds, with a high near 81. South wind 7 to 16 mph, with gusts as high as 23 mph.
Tuesday Night
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7pm. Low around 55. Southwest wind around 15 mph, with gusts as high as 24 mph. Chance of precipitation is 90%.
Wednesday
Showers and possibly a thunderstorm. Temperature rising to near 64 by 10am, then falling to around 49 during the remainder of the day. Breezy, with a southwest wind 14 to 21 mph becoming northwest in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 100%.
Wednesday Night
Mostly cloudy, with a low around 33. Breezy.
Thursday
Sunny, with a high near 53.
Thursday Night
Mostly cloudy, with a low around 44.
Friday
Partly sunny, with a high near 63.
Friday Night
Mostly cloudy, with a low around 38.
Saturday
Mostly sunny, with a high near 65.
Saturday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 49.
Sunday
A 50 percent chance of rain and thunderstorms. Mostly cloudy, with a high near 68. Breezy.
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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:
6:51 am CDT Mar 9, 2026
Forecast Valid:
7am CDT Mar 9, 2026-6pm CDT Mar 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