National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Fog/Mist

73°F

23°C

Humidity 96%
Wind Speed Calm
Barometer 29.90 in
Dewpoint 72°F (22°C)
Visibility 5.00 mi
Last update 27 Jun 3:55 am CDT
Extended Forecast for

3 Miles S Troy IL

Extreme Heat Watch June 28, 12:00pm until July 3, 12:00am
Click here for hazard details and duration
Extreme Heat Watch

  • Overnight

    Overnight: A 20 percent chance of showers. Mostly cloudy, with a low around 71. Calm wind.

    Low: 71 °F

    Slight Chance
    Showers

  • Saturday

    Saturday: A chance of showers, with thunderstorms also possible after 10am. Partly sunny, with a high near 85. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 30%.

    High: 85 °F

    Chance
    Showers then
    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: A 40 percent chance of showers and thunderstorms, mainly between 9pm and 5am. Increasing clouds, with a low around 72. Calm wind becoming southeast around 5 mph after midnight.

    Low: 72 °F

    Chance
    T-storms

  • Sunday

    Sunday: Partly sunny, then gradually becoming sunny, with a high near 94. Heat index values as high as 109. South wind 6 to 11 mph.

    High: 94 °F

    Becoming
    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 75. South wind 5 to 10 mph.

    Low: 75 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 95.

    High: 95 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 76.

    Low: 76 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 97.

    High: 97 °F

    Hot

  • Tuesday Night

    Tuesday Night: Clear, with a low around 76.

    Low: 76 °F

    Clear

Detailed Forecast

Overnight
A 20 percent chance of showers. Mostly cloudy, with a low around 71. Calm wind.
Saturday
A chance of showers, with thunderstorms also possible after 10am. Partly sunny, with a high near 85. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 30%.
Saturday Night
A 40 percent chance of showers and thunderstorms, mainly between 9pm and 5am. Increasing clouds, with a low around 72. Calm wind becoming southeast around 5 mph after midnight.
Sunday
Partly sunny, then gradually becoming sunny, with a high near 94. Heat index values as high as 109. South wind 6 to 11 mph.
Sunday Night
Mostly clear, with a low around 75. South wind 5 to 10 mph.
Monday
Sunny, with a high near 95.
Monday Night
Mostly clear, with a low around 76.
Tuesday
Sunny and hot, with a high near 97.
Tuesday Night
Clear, with a low around 76.
Wednesday
Sunny, with a high near 96.
Wednesday Night
Mostly clear, with a low around 77.
Thursday
Sunny, with a high near 95.
Thursday Night
Mostly clear, with a low around 76.
Friday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 94.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles S Troy IL
 38.7°N 89.89°W (Elev. 551 ft)
Last Update:
2:26 am CDT Jun 27, 2026
Forecast Valid:
4am CDT Jun 27, 2026-6pm CDT Jul 3, 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