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

Knoxville Downtown Airport (KDKX)

Lat: 35.97°NLon: 83.87°WElev: 827ft.

A Few Clouds

91°F

33°C

Humidity 63%
Wind Speed Vrbl 5 mph
Barometer 30.08 in
Dewpoint 77°F (25°C)
Visibility 10.00 mi
Heat Index104°F (40°C)
Last update 29 Jun 4:35 pm EDT
Extended Forecast for

5 Miles ESE Karns TN

Heat Advisory June 30, 11:00am until July 2, 09:00pm
Click here for hazard details and duration
Heat Advisory

  • Tonight

    Tonight: Mostly clear, with a low around 73. Calm wind.

    Low: 73 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny and hot, with a high near 94. Heat index values as high as 102. Calm wind.

    High: 94 °F

    Hot

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 74. Calm wind.

    Low: 74 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 95. Heat index values as high as 105. Calm wind.

    High: 95 °F

    Hot

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 75. Calm wind.

    Low: 75 °F

    Mostly Clear

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after 2pm. Sunny and hot, with a high near 95. Calm wind becoming northeast around 5 mph.

    High: 95 °F

    Sunny then
    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: A 20 percent chance of showers and thunderstorms before 2am. Mostly clear, with a low around 73. Calm wind.

    Low: 73 °F

    Slight Chance
    T-storms

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms after 2pm. Sunny and hot, with a high near 94.

    High: 94 °F

    Sunny then
    Chance
    T-storms

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms before 8pm. Mostly clear, with a low around 73.

    Low: 73 °F

    Chance
    T-storms then
    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 73. Calm wind.
Tuesday
Mostly sunny and hot, with a high near 94. Heat index values as high as 102. Calm wind.
Tuesday Night
Mostly clear, with a low around 74. Calm wind.
Wednesday
Sunny and hot, with a high near 95. Heat index values as high as 105. Calm wind.
Wednesday Night
Mostly clear, with a low around 75. Calm wind.
Thursday
A 20 percent chance of showers and thunderstorms after 2pm. Sunny and hot, with a high near 95. Calm wind becoming northeast around 5 mph.
Thursday Night
A 20 percent chance of showers and thunderstorms before 2am. Mostly clear, with a low around 73. Calm wind.
Friday
A 30 percent chance of showers and thunderstorms after 2pm. Sunny and hot, with a high near 94.
Friday Night
A 30 percent chance of showers and thunderstorms before 8pm. Mostly clear, with a low around 73.
Independence Day
A 30 percent chance of showers and thunderstorms after 2pm. Sunny and hot, with a high near 93.
Saturday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73.
Sunday
A 50 percent chance of showers and thunderstorms. Mostly sunny and hot, with a high near 92.
Sunday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73.
Monday
Showers and thunderstorms likely. Mostly sunny and hot, with a high near 90. Chance of precipitation is 70%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
5 Miles ESE Karns TN
 35.94°N 84.05°W (Elev. 974 ft)
Last Update:
2:26 pm EDT Jun 29, 2026
Forecast Valid:
4pm EDT Jun 29, 2026-6pm EDT 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