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

Atmospheric River Bringing Heavy Rain to Southern California and Heavy Snow to the Sierra Nevadas

A strong atmospheric river will continue heavy rain over southern California through Friday. The heaviest rainfall is ongoing today in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall has begun over the Sierra Nevada Mountains and will continue through Friday. Travel will become increasingly difficult over the passes due to snow and strong winds. Read More >

Current conditions at

Knoxville, McGhee Tyson Airport (KTYS)

Lat: 35.82°NLon: 83.99°WElev: 981ft.

Overcast

58°F

14°C

Humidity 93%
Wind Speed SW 5 mph
Barometer 30.05 in (1016.9 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 26 Dec 12:53 am EST
Extended Forecast for

Louisville TN

  • Overnight

    Overnight: Mostly cloudy, with a low around 55. Calm wind becoming southwest around 5 mph.

    Low: 55 °F

    Mostly Cloudy

  • Friday

    Friday: A 20 percent chance of showers after 3pm. Mostly cloudy, with a high near 70. Southwest wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 70 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: A 20 percent chance of showers between 10pm and midnight. Mostly cloudy, with a low around 59. Southwest wind 5 to 10 mph.

    Low: 59 °F

    Slight Chance
    Showers then
    Mostly Cloudy

  • Saturday

    Saturday: Cloudy, then gradually becoming mostly sunny, with a high near 72. Calm wind.

    High: 72 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 57. Calm wind becoming south around 5 mph.

    Low: 57 °F

    Mostly Cloudy

  • Sunday

    Sunday: A 20 percent chance of showers. Mostly cloudy, with a high near 73. Southwest wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 73 °F

    Slight Chance
    Showers

  • Sunday Night

    Sunday Night: Showers, mainly after 1am. Low around 47. Southwest wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%.

    Low: 47 °F

    Chance
    Showers then
    Showers

  • Monday

    Monday: Showers likely, mainly before 1pm. Partly sunny, with a high near 60. Breezy. Chance of precipitation is 70%.

    High: 60 °F

    Showers
    Likely and
    Breezy

  • Monday Night

    Monday Night: Partly cloudy, with a low around 23.

    Low: 23 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 55. Calm wind becoming southwest around 5 mph.
Friday
A 20 percent chance of showers after 3pm. Mostly cloudy, with a high near 70. Southwest wind 5 to 15 mph, with gusts as high as 25 mph.
Friday Night
A 20 percent chance of showers between 10pm and midnight. Mostly cloudy, with a low around 59. Southwest wind 5 to 10 mph.
Saturday
Cloudy, then gradually becoming mostly sunny, with a high near 72. Calm wind.
Saturday Night
Mostly cloudy, with a low around 57. Calm wind becoming south around 5 mph.
Sunday
A 20 percent chance of showers. Mostly cloudy, with a high near 73. Southwest wind 5 to 15 mph, with gusts as high as 20 mph.
Sunday Night
Showers, mainly after 1am. Low around 47. Southwest wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%.
Monday
Showers likely, mainly before 1pm. Partly sunny, with a high near 60. Breezy. Chance of precipitation is 70%.
Monday Night
Partly cloudy, with a low around 23.
Tuesday
Sunny, with a high near 38.
Tuesday Night
Mostly clear, with a low around 22.
Wednesday
Mostly sunny, with a high near 44.
Wednesday Night
Partly cloudy, with a low around 25.
New Year's Day
Mostly sunny, with a high near 45.
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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:
12:31 am EST Dec 26, 2025
Forecast Valid:
1am EST Dec 26, 2025-6pm EST Jan 1, 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