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

Heat the Southwest; Fire Weather in the Central U.S.; Kona Low Impacting Hawaii

A rare March heat wave is ongoing with much above-normal temperatures over the Southwest U.S. through this weekend. Periods of critical fire weather will persist from the central Rockies to the central and southern Plains through the weekend as gusty winds and low relative humidity continue. A Kona low will continue to bring several rounds of moderate to heavy rainfall to Hawaii through Sunday. Read More >

Current conditions at

Knoxville, McGhee Tyson Airport (KTYS)

Lat: 35.82°NLon: 83.99°WElev: 981ft.

Overcast

72°F

22°C

Humidity 40%
Wind Speed SW 16 G 28 mph
Barometer 29.95 in (1013.8 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 20 Mar 5:53 pm EDT
Extended Forecast for

Louisville TN

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 56. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 56 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 80. Southwest wind 5 to 10 mph.

    High: 80 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms, mainly before 8pm. Partly cloudy, with a low around 58. Southwest wind around 5 mph.

    Low: 58 °F

    Chance
    T-storms

  • Sunday

    Sunday: Sunny, with a high near 84. Southwest wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 84 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 59. Southwest wind around 10 mph, with gusts as high as 25 mph.

    Low: 59 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 69. West wind 10 to 15 mph becoming north in the morning. Winds could gust as high as 20 mph.

    High: 69 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 41. Northeast wind around 10 mph, with gusts as high as 20 mph.

    Low: 41 °F

    Mostly Clear

  • Tuesday

    Tuesday: Partly sunny, with a high near 68.

    High: 68 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after 2am. Mostly cloudy, with a low around 47.

    Low: 47 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 56. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 80. Southwest wind 5 to 10 mph.
Saturday Night
A 30 percent chance of showers and thunderstorms, mainly before 8pm. Partly cloudy, with a low around 58. Southwest wind around 5 mph.
Sunday
Sunny, with a high near 84. Southwest wind 5 to 15 mph, with gusts as high as 25 mph.
Sunday Night
Partly cloudy, with a low around 59. Southwest wind around 10 mph, with gusts as high as 25 mph.
Monday
Partly sunny, with a high near 69. West wind 10 to 15 mph becoming north in the morning. Winds could gust as high as 20 mph.
Monday Night
Mostly clear, with a low around 41. Northeast wind around 10 mph, with gusts as high as 20 mph.
Tuesday
Partly sunny, with a high near 68.
Tuesday Night
A 20 percent chance of showers after 2am. Mostly cloudy, with a low around 47.
Wednesday
A 20 percent chance of showers. Partly sunny, with a high near 65.
Wednesday Night
Mostly cloudy, with a low around 47.
Thursday
Mostly sunny, with a high near 77.
Thursday Night
A 30 percent chance of showers. Mostly clear, with a low around 54.
Friday
A 50 percent chance of showers. Partly sunny, with a high near 71.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Louisville TN
 35.81°N 84.04°W (Elev. 850 ft)
Last Update:
2:26 pm EDT Mar 20, 2026
Forecast Valid:
6pm EDT Mar 20, 2026-6pm EDT Mar 27, 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