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

53°F

12°C

Humidity 89%
Wind Speed Calm
Barometer 30.00 in
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 11 Oct 12:35 am CDT
Extended Forecast for

Troy IL

  • Overnight

    Overnight: Partly cloudy, with a low around 53. Calm wind.

    Low: 53 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 87. Light and variable wind.

    High: 87 °F

    Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 64. Calm wind becoming south around 5 mph in the evening.

    Low: 64 °F

    Increasing
    Clouds

  • Columbus Day

    Columbus Day: Sunny, with a high near 93. Southwest wind 6 to 13 mph.

    High: 93 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 68. South wind 7 to 10 mph.

    Low: 68 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 91.

    High: 91 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers after 1am. Mostly clear, with a low around 68.

    Low: 68 °F

    Mostly Clear
    then Chance
    Showers

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 84. Chance of precipitation is 70%.

    High: 84 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.

    Low: 64 °F

    Showers
    Likely

Detailed Forecast

Overnight
Partly cloudy, with a low around 53. Calm wind.
Sunday
Sunny, with a high near 87. Light and variable wind.
Sunday Night
Increasing clouds, with a low around 64. Calm wind becoming south around 5 mph in the evening.
Columbus Day
Sunny, with a high near 93. Southwest wind 6 to 13 mph.
Monday Night
Clear, with a low around 68. South wind 7 to 10 mph.
Tuesday
Sunny, with a high near 91.
Tuesday Night
A 40 percent chance of showers after 1am. Mostly clear, with a low around 68.
Wednesday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 84. Chance of precipitation is 70%.
Wednesday Night
Showers likely. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.
Thursday
Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 78. Chance of precipitation is 60%.
Thursday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 56.
Friday
A 20 percent chance of showers. Partly sunny, with a high near 71. Breezy.
Friday Night
Partly cloudy, with a low around 45.
Saturday
Mostly sunny, with a high near 64.
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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:
10:26 pm CDT Oct 10, 2026
Forecast Valid:
1am CDT Oct 11, 2026-6pm CDT Oct 17, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation