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

84°F

29°C

Humidity 70%
Wind Speed Vrbl 3 mph
Barometer 29.93 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index90°F (32°C)
Last update 5 Jul 5:50 pm CDT
Extended Forecast for

Troy ILSimilar City Names

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before midnight. Patchy fog after midnight. Otherwise, partly cloudy, with a low around 68. North wind around 5 mph becoming calm in the evening.

    Low: 68 °F

    Slight Chance
    T-storms then
    Patchy Fog

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 85. North wind 5 to 9 mph.

    High: 85 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 67. North wind 5 to 8 mph becoming calm in the evening.

    Low: 67 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 86. Calm wind becoming north around 6 mph in the morning.

    High: 86 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 67. Northeast wind around 6 mph becoming calm in the evening.

    Low: 67 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 90.

    High: 90 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 72.

    Low: 72 °F

    Mostly Clear

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94.

    High: 94 °F

    Sunny then
    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 74. Chance of precipitation is 60%.

    Low: 74 °F

    Chance
    T-storms then
    Showers
    Likely

Detailed Forecast

Tonight
A 20 percent chance of showers and thunderstorms before midnight. Patchy fog after midnight. Otherwise, partly cloudy, with a low around 68. North wind around 5 mph becoming calm in the evening.
Monday
A 20 percent chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 85. North wind 5 to 9 mph.
Monday Night
Partly cloudy, with a low around 67. North wind 5 to 8 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 86. Calm wind becoming north around 6 mph in the morning.
Tuesday Night
Mostly clear, with a low around 67. Northeast wind around 6 mph becoming calm in the evening.
Wednesday
Sunny, with a high near 90.
Wednesday Night
Mostly clear, with a low around 72.
Thursday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94.
Thursday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 74. Chance of precipitation is 60%.
Friday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 89.
Friday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 71.
Saturday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 88.
Saturday Night
A 20 percent chance of showers. Partly cloudy, with a low around 69.
Sunday
Mostly sunny, with a high near 89.
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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:
5:41 pm CDT Jul 5, 2026
Forecast Valid:
6pm CDT Jul 5, 2026-6pm CDT Jul 12, 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