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

Areas of Extreme Heat and Excessive Rainfall Potential

Dangerous and extreme heat will remain across portions of the central U.S. this week, persisting across the mid to lower Mississippi Valley, Gulf Coast, southern Plains and portions of Texas. A heat wave over the Southwest U.S. will peak this weekend. Heavy to excessive rainfall may produce flash flooding from the Delmarva Peninsula north into the Hudson Valley today and tonight. Read More >

Hazardous Weather Conditions

Current conditions at

Knoxville, McGhee Tyson Airport (KTYS)

Lat: 35.82°NLon: 83.99°WElev: 981ft.

Mostly Cloudy

82°F

28°C

Humidity 74%
Wind Speed SW 10 mph
Barometer 29.84 in (1009.1 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 28 Jul 9:53 am EDT
Extended Forecast for

Seymour TNSimilar City Names

  • Today

    Today: Showers and thunderstorms likely, mainly after 5pm. Mostly sunny and hot, with a high near 91. Heat index values as high as 102. West wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 91 °F

    Chance
    Showers then
    T-storms
    Likely

  • Tonight

    Tonight: Showers and thunderstorms likely before 11pm, then a slight chance of showers between 11pm and midnight. Partly cloudy, with a low around 70. West wind 5 to 10 mph becoming light northwest after midnight. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 70 °F

    T-storms
    Likely then
    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 86. Calm wind becoming northwest around 5 mph in the afternoon.

    High: 86 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 63. North wind around 5 mph becoming calm in the evening.

    Low: 63 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 84. Calm wind becoming northeast around 5 mph in the morning.

    High: 84 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 63. North wind around 5 mph becoming calm.

    Low: 63 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 86. Calm wind.

    High: 86 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 67.

    Low: 67 °F

    Mostly Cloudy

  • Saturday

    Saturday: A slight chance of showers, then a chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 86. Chance of precipitation is 40%.

    High: 86 °F

    Slight Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

Today
Showers and thunderstorms likely, mainly after 5pm. Mostly sunny and hot, with a high near 91. Heat index values as high as 102. West wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tonight
Showers and thunderstorms likely before 11pm, then a slight chance of showers between 11pm and midnight. Partly cloudy, with a low around 70. West wind 5 to 10 mph becoming light northwest after midnight. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday
Mostly sunny, with a high near 86. Calm wind becoming northwest around 5 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 63. North wind around 5 mph becoming calm in the evening.
Thursday
Sunny, with a high near 84. Calm wind becoming northeast around 5 mph in the morning.
Thursday Night
Mostly clear, with a low around 63. North wind around 5 mph becoming calm.
Friday
Mostly sunny, with a high near 86. Calm wind.
Friday Night
Mostly cloudy, with a low around 67.
Saturday
A slight chance of showers, then a chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 86. Chance of precipitation is 40%.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 69. Chance of precipitation is 50%.
Sunday
Showers and thunderstorms likely. Mostly cloudy, with a high near 85. Chance of precipitation is 70%.
Sunday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 69. Chance of precipitation is 60%.
Monday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 85.
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ABOUT THIS FORECAST

 
Point Forecast:
Seymour TNSimilar City Names
 35.88°N 83.78°W (Elev. 1073 ft)
Last Update:
7:06 am EDT Jul 28, 2026
Forecast Valid:
10am EDT Jul 28, 2026-6pm EDT Aug 3, 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