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

Heavy Rainfall to Bring Flooding Threat to California; Heavy Snow in the Sierra

A strong atmospheric river will bring heavy rainfall to California through the holiday week. The heaviest rainfall is expected on Wednesday in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall is expected in the Sierra Nevada from the atmospheric river, raising concerns for major snow‐load impacts. Travel may be difficult to impossible over the passes. Read More >

Current conditions at

Knoxville, McGhee Tyson Airport (KTYS)

Lat: 35.82°NLon: 83.99°WElev: 981ft.

Overcast

58°F

14°C

Humidity 84%
Wind Speed Calm
Barometer 30.28 in (1025.1 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Last update 24 Dec 7:53 am EST
Extended Forecast for

Knoxville, McGhee Tyson Airport TN

  • Today

    Today: A 20 percent chance of showers before 9am. Mostly cloudy, with a high near 68. Calm wind becoming southwest around 5 mph.

    High: 68 °F

    Slight Chance
    Showers then
    Mostly Cloudy

  • Tonight

    Tonight: A slight chance of showers between 3am and 4am. Mostly cloudy, with a low around 55. Southwest wind 5 to 10 mph. Chance of precipitation is 20%.

    Low: 55 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Christmas Day

    Christmas Day: A 40 percent chance of showers after 7am. Mostly cloudy, with a high near 68. Southwest wind around 10 mph.

    High: 68 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 55. Southwest wind around 5 mph.

    Low: 55 °F

    Chance
    Showers

  • Friday

    Friday: A 30 percent chance of showers. Mostly cloudy, with a high near 70. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 70 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 58. Southwest wind around 10 mph, with gusts as high as 20 mph.

    Low: 58 °F

    Chance
    Showers

  • Saturday

    Saturday: Mostly cloudy, with a high near 73. Southwest wind around 10 mph.

    High: 73 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 56.

    Low: 56 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Sunday

    Sunday: Showers likely, mainly after 1pm. Mostly cloudy, with a high near 69. Breezy. Chance of precipitation is 60%.

    High: 69 °F

    Chance
    Showers then
    Showers
    Likely and
    Breezy

Detailed Forecast

Today
A 20 percent chance of showers before 9am. Mostly cloudy, with a high near 68. Calm wind becoming southwest around 5 mph.
Tonight
A slight chance of showers between 3am and 4am. Mostly cloudy, with a low around 55. Southwest wind 5 to 10 mph. Chance of precipitation is 20%.
Christmas Day
A 40 percent chance of showers after 7am. Mostly cloudy, with a high near 68. Southwest wind around 10 mph.
Thursday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 55. Southwest wind around 5 mph.
Friday
A 30 percent chance of showers. Mostly cloudy, with a high near 70. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Friday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 58. Southwest wind around 10 mph, with gusts as high as 20 mph.
Saturday
Mostly cloudy, with a high near 73. Southwest wind around 10 mph.
Saturday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 56.
Sunday
Showers likely, mainly after 1pm. Mostly cloudy, with a high near 69. Breezy. Chance of precipitation is 60%.
Sunday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 30.
Monday
Mostly sunny, with a high near 38.
Monday Night
Mostly clear, with a low around 19.
Tuesday
Mostly sunny, with a high near 35.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Knoxville, McGhee Tyson Airport TN
 35.83°N 83.98°W (Elev. 961 ft)
Last Update:
6:06 am EST Dec 24, 2025
Forecast Valid:
8am EST Dec 24, 2025-6pm EST Dec 30, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation