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

Hartford IL

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. Patchy fog. Otherwise, mostly cloudy, with a low around 72. Calm wind.

    Low: 72 °F

    Chance
    T-storms and
    Patchy Fog

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms before 8am. Patchy fog before 8am. Otherwise, partly sunny, then gradually becoming sunny, with a high near 94. Heat index values as high as 109. Light southeast wind becoming south 5 to 10 mph in the morning.

    High: 94 °F

    Slight Chance
    T-storms and
    Patchy Fog
    then Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 76. South wind 5 to 10 mph.

    Low: 76 °F

    Increasing
    Clouds

  • Monday

    Monday: Mostly sunny, with a high near 96. Heat index values as high as 110. South wind 6 to 13 mph.

    High: 96 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 77. South wind 5 to 11 mph.

    Low: 77 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 98.

    High: 98 °F

    Hot

  • Tuesday Night

    Tuesday Night: Clear, with a low around 77.

    Low: 77 °F

    Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 98.

    High: 98 °F

    Hot

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 78.

    Low: 78 °F

    Mostly Clear

Detailed Forecast

Overnight
A 30 percent chance of showers and thunderstorms. Patchy fog. Otherwise, mostly cloudy, with a low around 72. Calm wind.
Sunday
A 20 percent chance of showers and thunderstorms before 8am. Patchy fog before 8am. Otherwise, partly sunny, then gradually becoming sunny, with a high near 94. Heat index values as high as 109. Light southeast wind becoming south 5 to 10 mph in the morning.
Sunday Night
Increasing clouds, with a low around 76. South wind 5 to 10 mph.
Monday
Mostly sunny, with a high near 96. Heat index values as high as 110. South wind 6 to 13 mph.
Monday Night
Mostly clear, with a low around 77. South wind 5 to 11 mph.
Tuesday
Sunny and hot, with a high near 98.
Tuesday Night
Clear, with a low around 77.
Wednesday
Sunny and hot, with a high near 98.
Wednesday Night
Mostly clear, with a low around 78.
Thursday
Sunny and hot, with a high near 97.
Thursday Night
Mostly clear, with a low around 77.
Friday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 96.
Friday Night
Partly cloudy, with a low around 77.
Independence Day
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 95.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Hartford IL
 38.84°N 90.11°W (Elev. 407 ft)
Last Update:
2:36 am CDT Jun 28, 2026
Forecast Valid:
4am CDT Jun 28, 2026-6pm CDT Jul 4, 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