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

Heat Builds in the West; Extremely Critical Fire Weather in the Northwest

A heat wave over the Southwest will intensify this week, peaking and expanding into the Intermountain West and northern High Plains this weekend. Critical to extremely critical fire weather conditions are forecast from the Northwest and the northern Great Basin this weekend. Particularly Dangerous Situation Red Flag Warnings have been issued. Read More >

Current conditions at

Knoxville, McGhee Tyson Airport (KTYS)

Lat: 35.82°NLon: 83.99°WElev: 981ft.

Mostly Cloudy

86°F

30°C

Humidity 46%
Wind Speed Calm
Barometer 30.00 in (1014.7 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 31 Jul 2:53 pm EDT
Extended Forecast for

Knoxville, McGhee Tyson Airport TN

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 89. West wind around 5 mph.

    High: 89 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 69. South wind around 5 mph.

    Low: 69 °F

    Mostly Cloudy

  • Saturday

    Saturday: A chance of showers and thunderstorms before noon, then showers likely and possibly a thunderstorm between noon and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly cloudy, with a high near 87. Northwest wind 5 to 15 mph becoming south in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 87 °F

    Chance
    T-storms then
    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers and thunderstorms before 2am, then a chance of showers. Low around 72. South wind around 10 mph. Chance of precipitation is 80%.

    Low: 72 °F

    Showers

  • Sunday

    Sunday: A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 86. Southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.

    High: 86 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: Showers and thunderstorms likely before 11pm, then a chance of showers between 11pm and 2am. Mostly cloudy, with a low around 69. Southwest wind 5 to 10 mph. Chance of precipitation is 60%.

    Low: 69 °F

    Showers
    Likely then
    Chance
    Showers

  • Monday

    Monday: A slight chance of thunderstorms, then a chance of showers and thunderstorms after 8am. Partly sunny, with a high near 85. West wind 5 to 10 mph. Chance of precipitation is 50%.

    High: 85 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: A 20 percent chance of showers before 2am. Partly cloudy, with a low around 69.

    Low: 69 °F

    Slight Chance
    Showers

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 87.

    High: 87 °F

    Mostly Sunny
    then Chance
    T-storms

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 89. West wind around 5 mph.
Tonight
Mostly cloudy, with a low around 69. South wind around 5 mph.
Saturday
A chance of showers and thunderstorms before noon, then showers likely and possibly a thunderstorm between noon and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly cloudy, with a high near 87. Northwest wind 5 to 15 mph becoming south in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday Night
Showers and thunderstorms before 2am, then a chance of showers. Low around 72. South wind around 10 mph. Chance of precipitation is 80%.
Sunday
A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 86. Southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
Sunday Night
Showers and thunderstorms likely before 11pm, then a chance of showers between 11pm and 2am. Mostly cloudy, with a low around 69. Southwest wind 5 to 10 mph. Chance of precipitation is 60%.
Monday
A slight chance of thunderstorms, then a chance of showers and thunderstorms after 8am. Partly sunny, with a high near 85. West wind 5 to 10 mph. Chance of precipitation is 50%.
Monday Night
A 20 percent chance of showers before 2am. Partly cloudy, with a low around 69.
Tuesday
A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 87.
Tuesday Night
A 30 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 69.
Wednesday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
Wednesday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71.
Thursday
A 30 percent chance of showers and thunderstorms. Mostly sunny and hot, with a high near 91.
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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:
2:26 pm EDT Jul 31, 2026
Forecast Valid:
3pm EDT Jul 31, 2026-6pm EDT Aug 6, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation