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

Severe Weather and Heavy Rainfall from the Midwest to the Ohio Valley; Mid-Summer Heat Continues

Severe thunderstorm and heavy rainfall threats will persist from the Midwest to Lower Great Lakes through Monday, shifting into the Ohio Valley and Central Appalachians Monday evening into Tuesday. Mid-summer heat will continue across much of the CONUS this week, with record highs possible well into the 100s across the south-central High Plains. Read More >

Hazardous Weather Conditions

Current conditions at

Knoxville, McGhee Tyson Airport (KTYS)

Lat: 35.82°NLon: 83.99°WElev: 981ft.

Overcast

77°F

25°C

Humidity 79%
Wind Speed NW 3 mph
Barometer 30.11 in (1018.5 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 9 Aug 7:53 pm EDT
Extended Forecast for

Knoxville, McGhee Tyson Airport TN

  • Tonight

    Tonight: Mostly cloudy, with a low around 72. West wind around 5 mph becoming southeast in the evening.

    Low: 72 °F

    Mostly Cloudy

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms, mainly between 4pm and 5pm. Mostly sunny and hot, with a high near 90. West wind 5 to 10 mph.

    High: 90 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Monday Night

    Monday Night: Mostly clear, with a low around 73. Southwest wind 5 to 10 mph.

    Low: 73 °F

    Mostly Clear

  • Tuesday

    Tuesday: A slight chance of showers, then a chance of showers and thunderstorms after 11am. Sunny and hot, with a high near 91. Heat index values as high as 98. Southwest wind around 10 mph. Chance of precipitation is 40%.

    High: 91 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms before 11pm, then a slight chance of showers. Partly cloudy, with a low around 73. Southwest wind around 10 mph. Chance of precipitation is 30%.

    Low: 73 °F

    Chance
    T-storms then
    Slight Chance
    Showers

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm. Mostly sunny and hot, with a high near 90. Southwest wind around 10 mph. Chance of precipitation is 60%.

    High: 90 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before 2am, then a slight chance of showers. Partly cloudy, with a low around 74. Southwest wind around 5 mph. Chance of precipitation is 30%.

    Low: 74 °F

    Chance
    T-storms

  • Thursday

    Thursday: A slight chance of showers, then a chance of showers and thunderstorms after 8am. Partly sunny and hot, with a high near 90. Chance of precipitation is 50%.

    High: 90 °F

    Chance
    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 74.

    Low: 74 °F

    Chance
    T-storms then
    Chance
    Showers

Detailed Forecast

Tonight
Mostly cloudy, with a low around 72. West wind around 5 mph becoming southeast in the evening.
Monday
A 20 percent chance of showers and thunderstorms, mainly between 4pm and 5pm. Mostly sunny and hot, with a high near 90. West wind 5 to 10 mph.
Monday Night
Mostly clear, with a low around 73. Southwest wind 5 to 10 mph.
Tuesday
A slight chance of showers, then a chance of showers and thunderstorms after 11am. Sunny and hot, with a high near 91. Heat index values as high as 98. Southwest wind around 10 mph. Chance of precipitation is 40%.
Tuesday Night
A chance of showers and thunderstorms before 11pm, then a slight chance of showers. Partly cloudy, with a low around 73. Southwest wind around 10 mph. Chance of precipitation is 30%.
Wednesday
Showers likely and possibly a thunderstorm. Mostly sunny and hot, with a high near 90. Southwest wind around 10 mph. Chance of precipitation is 60%.
Wednesday Night
A chance of showers and thunderstorms before 2am, then a slight chance of showers. Partly cloudy, with a low around 74. Southwest wind around 5 mph. Chance of precipitation is 30%.
Thursday
A slight chance of showers, then a chance of showers and thunderstorms after 8am. Partly sunny and hot, with a high near 90. Chance of precipitation is 50%.
Thursday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 74.
Friday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 89. Chance of precipitation is 60%.
Friday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 74. Chance of precipitation is 60%.
Saturday
A 30 percent chance of showers and thunderstorms. Partly sunny and hot, with a high near 91.
Saturday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Sunday
A 30 percent chance of showers and thunderstorms. Mostly sunny and hot, with a high near 91.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Knoxville, McGhee Tyson Airport TN
 35.83°N 83.98°W (Elev. 961 ft)
Last Update:
7:06 pm EDT Aug 9, 2026
Forecast Valid:
8pm EDT Aug 9, 2026-6pm EDT Aug 16, 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