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

Dangerous Heat in the Central and Eastern U.S.; Critical Fire Weather in the Great Basin and 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 Tuesday across portions of the Four Corners and Great Basin, as dry conditions and gusty winds persist. Read More >

Hazardous Weather Conditions

Current conditions at

Mount Sterling, Mount Sterling Municipal Airport (KI63)

Lat: 39.99°NLon: 90.8°WElev: 732ft.

Fair

81°F

27°C

Humidity 87%
Wind Speed S 7 mph
Barometer 29.90 in
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index88°F (31°C)
Last update 29 Jun 8:55 pm CDT
Extended Forecast for

3 Miles E Augusta IL

Heat Advisory June 29, 09:03pm until July 3, 12:00am
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory June 29, 09:03pm until July 3, 12:00am

    NOW until 12:00am Fri

    Heat Advisory

  • Tonight

    Low: 75 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 94. Heat index values as high as 106. South southwest wind 11 to 16 mph, with gusts as high as 28 mph.

    High: 94 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 74. South southwest wind 7 to 13 mph, with gusts as high as 25 mph.

    Low: 74 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 93. Heat index values as high as 101. South southwest wind 8 to 14 mph, with gusts as high as 22 mph.

    High: 93 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 76. South wind 8 to 11 mph, with gusts as high as 20 mph.

    Low: 76 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 93. Southwest wind 7 to 11 mph, with gusts as high as 18 mph.

    High: 93 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 76. South wind 6 to 8 mph.

    Low: 76 °F

    Partly Cloudy

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91.

    High: 91 °F

    Mostly Sunny
    then Chance
    T-storms

Detailed Forecast

Tonight
Partly cloudy, with a low around 75. South southwest wind 9 to 11 mph, with gusts as high as 22 mph.
Tuesday
Sunny, with a high near 94. Heat index values as high as 106. South southwest wind 11 to 16 mph, with gusts as high as 28 mph.
Tuesday Night
Clear, with a low around 74. South southwest wind 7 to 13 mph, with gusts as high as 25 mph.
Wednesday
Sunny, with a high near 93. Heat index values as high as 101. South southwest wind 8 to 14 mph, with gusts as high as 22 mph.
Wednesday Night
Mostly clear, with a low around 76. South wind 8 to 11 mph, with gusts as high as 20 mph.
Thursday
Mostly sunny, with a high near 93. Southwest wind 7 to 11 mph, with gusts as high as 18 mph.
Thursday Night
Partly cloudy, with a low around 76. South wind 6 to 8 mph.
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
Mostly sunny, with a high near 92.
Saturday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 89.
Sunday Night
A chance of showers. Partly cloudy, with a low around 70.
Monday
Mostly sunny, with a high near 87.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles E Augusta IL
 40.23°N 90.91°W (Elev. 600 ft)
Last Update:
7:36 pm CDT Jun 29, 2026
Forecast Valid:
9pm CDT Jun 29, 2026-6pm CDT Jul 6, 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