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.

Mostly Cloudy

74°F

23°C

Humidity 96%
Wind Speed Calm
Barometer 29.88 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Last update 28 Jun 3:35 am CDT
Extended Forecast for

Highland ILSimilar City Names

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

  • Overnight

    Overnight: A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 71. Calm wind.

    Low: 71 °F

    Chance
    T-storms

  • Sunday

    Sunday: A 30 percent chance of showers and thunderstorms, mainly before 7am. Patchy fog before 8am. Otherwise, partly sunny, then gradually becoming sunny, with a high near 92. Heat index values as high as 109. Light southeast wind becoming south 5 to 10 mph in the morning.

    High: 92 °F

    Chance
    T-storms and
    Patchy Fog
    then 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: Mostly sunny, with a high near 94. Heat index values as high as 110. South wind 5 to 13 mph.

    High: 94 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 75. South wind 5 to 13 mph, with gusts as high as 20 mph.

    Low: 75 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 95.

    High: 95 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 75.

    Low: 75 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 95.

    High: 95 °F

    Sunny

  • Wednesday Night

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

    Low: 76 °F

    Mostly Clear

Detailed Forecast

Overnight
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 71. Calm wind.
Sunday
A 30 percent chance of showers and thunderstorms, mainly before 7am. Patchy fog before 8am. Otherwise, partly sunny, then gradually becoming sunny, with a high near 92. Heat index values as high as 109. Light southeast wind becoming south 5 to 10 mph in the morning.
Sunday Night
Mostly clear, with a low around 75. South wind 5 to 10 mph.
Monday
Mostly sunny, with a high near 94. Heat index values as high as 110. South wind 5 to 13 mph.
Monday Night
Mostly clear, with a low around 75. South wind 5 to 13 mph, with gusts as high as 20 mph.
Tuesday
Sunny, with a high near 95.
Tuesday Night
Clear, with a low around 75.
Wednesday
Sunny, with a high near 95.
Wednesday Night
Mostly clear, with a low around 76.
Thursday
Sunny, with a high near 94.
Thursday Night
Mostly clear, with a low around 76.
Friday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 93.
Friday Night
Mostly clear, with a low around 75.
Independence Day
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 93.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Highland ILSimilar City Names
 38.74°N 89.69°W (Elev. 548 ft)
Last Update:
2:36 am CDT Jun 28, 2026
Forecast Valid:
3am CDT Jun 28, 2026-6pm CDT Jul 4, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

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Chance of Precipitation