Dangerous Heat in the Southwest; Severe Thunderstorms and Heavy Rain in the Northeast and Mid-Atlantic

Dangerous heat will persist across the Southwest U.S. through Friday with daytime highs of 110-115°F. Heat across the southern Plains will briefly ease to near-normal by late week. Strong to severe thunderstorms may produce damaging wind, hail, a tornado or two, heavy rain and flash flooding across parts of the Mid-Atlantic and Northeast. Heavy rainfall threat continues across the Gulf Coast. Read More >

Hazardous Weather Conditions

Current conditions at

Knoxville, McGhee Tyson Airport (KTYS)

Lat: 35.82°NLon: 83.99°WElev: 981ft.

Partly Cloudy

69°F

21°C

Humidity 93%
Wind Speed S 3 mph
Barometer 29.98 in (1014.0 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Last update 27 Aug 6:53 am EDT
Extended Forecast for

6 Miles WSW Mascot TN

  • Today

    Today: A 30 percent chance of showers and thunderstorms, mainly after 5pm.  Partly sunny and hot, with a high near 90. Heat index values as high as 95. Calm wind becoming west around 5 mph.

    High: 90 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms before 1am, then a slight chance of showers after 2am.  Mostly cloudy, with a low around 68. Calm wind.  Chance of precipitation is 40%.

    Low: 68 °F

    Chance
    T-storms

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms, mainly between 4pm and 5pm.  Mostly cloudy, then gradually becoming sunny, with a high near 89. Calm wind.

    High: 89 °F

    Partly Sunny
    then Chance
    T-storms

  • Friday Night

    Friday Night: Mostly clear, with a low around 67. Calm wind.

    Low: 67 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny and hot, with a high near 90. Calm wind.

    High: 90 °F

    Hot

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 69. Calm wind.

    Low: 69 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny and hot, with a high near 91. Calm wind.

    High: 91 °F

    Hot

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 71.

    Low: 71 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 92.

    High: 92 °F

    Hot

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms, mainly after 5pm. Partly sunny and hot, with a high near 90. Heat index values as high as 95. Calm wind becoming west around 5 mph.
Tonight
A chance of showers and thunderstorms before 1am, then a slight chance of showers after 2am. Mostly cloudy, with a low around 68. Calm wind. Chance of precipitation is 40%.
Friday
A 30 percent chance of showers and thunderstorms, mainly between 4pm and 5pm. Mostly cloudy, then gradually becoming sunny, with a high near 89. Calm wind.
Friday Night
Mostly clear, with a low around 67. Calm wind.
Saturday
Sunny and hot, with a high near 90. Calm wind.
Saturday Night
Partly cloudy, with a low around 69. Calm wind.
Sunday
Mostly sunny and hot, with a high near 91. Calm wind.
Sunday Night
Mostly clear, with a low around 71.
Monday
Sunny and hot, with a high near 92.
Monday Night
Mostly clear, with a low around 71.
Tuesday
Sunny and hot, with a high near 93.
Tuesday Night
Mostly clear, with a low around 73.
Wednesday
A 20 percent chance of showers and thunderstorms. Sunny and hot, with a high near 94.
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ABOUT THIS FORECAST

 
Point Forecast:
6 Miles WSW Mascot TN
 36.02°N 83.85°W (Elev. 899 ft)
7:06 am EDT Aug 27, 2026
7am EDT Aug 27, 2026-6pm EDT Sep 2, 2026
 
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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