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

Dangerous Heat in the East; Critical Fire Weather in the Southwest

Dangerous, record-breaking heat will intensify across most of the central and eastern U.S this week. Heat indices will likely exceed 100 degrees. Heat is likely to continue across the eastern U.S. through the Independence Day holiday weekend. Critical fire weather conditions will continue today and likely Tuesday across portions of the Four Corners and northern High Plains. Read More >

Hazardous Weather Conditions

Current conditions at

Effingham, Effingham County Memorial Airport (K1H2)

Lat: 39.07°NLon: 88.53°WElev: 587ft.

Partly Cloudy

86°F

30°C

Humidity 83%
Wind Speed SE 7 mph
Barometer 30.03 in
Dewpoint 80°F (27°C)
Visibility 10.00 mi
Heat Index101°F (38°C)
Last update 29 Jun 11:35 am CDT
Extended Forecast for

Altamont IL

Heat Advisory until July 3, 12:00am
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory until July 3, 12:00am

    NOW until 12:00am Fri

    Heat Advisory

  • Today

    High: 91 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 74. South wind 6 to 9 mph, with gusts as high as 18 mph.

    Low: 74 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 94. Heat index values as high as 105. South southwest wind 6 to 10 mph, with gusts as high as 16 mph.

    High: 94 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 74. South southwest wind 5 to 8 mph, with gusts as high as 17 mph.

    Low: 74 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 94. South southwest wind 3 to 8 mph.

    High: 94 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 74. South wind 3 to 6 mph.

    Low: 74 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 93. South southwest wind 3 to 7 mph.

    High: 93 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 74.

    Low: 74 °F

    Mostly Clear

Detailed Forecast

Today
Mostly sunny, with a high near 91. Heat index values as high as 103. South wind 9 to 11 mph, with gusts as high as 18 mph.
Tonight
Partly cloudy, with a low around 74. South wind 6 to 9 mph, with gusts as high as 18 mph.
Tuesday
Sunny, with a high near 94. Heat index values as high as 105. South southwest wind 6 to 10 mph, with gusts as high as 16 mph.
Tuesday Night
Clear, with a low around 74. South southwest wind 5 to 8 mph, with gusts as high as 17 mph.
Wednesday
Sunny, with a high near 94. South southwest wind 3 to 8 mph.
Wednesday Night
Clear, with a low around 74. South wind 3 to 6 mph.
Thursday
Sunny, with a high near 93. South southwest wind 3 to 7 mph.
Thursday Night
Mostly clear, with a low around 74.
Friday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91.
Friday Night
Partly cloudy, with a low around 74.
Independence Day
A chance of showers and thunderstorms. Mostly sunny, with a high near 91.
Saturday Night
Mostly clear, with a low around 72.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 88.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Altamont IL
 39.06°N 88.73°W (Elev. 600 ft)
Last Update:
11:36 am CDT Jun 29, 2026
Forecast Valid:
11am CDT Jun 29, 2026-6pm CDT Jul 5, 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