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 >

Hazardous Weather Conditions

Current conditions at

Watertown, Watertown Municipal Airport (KATY)

Lat: 44.9°NLon: 97.15°WElev: 1745ft.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Watertown SD

Dense Fog Advisory until December 25, 10:00am
Click here for hazard details and duration
Dense Fog Advisory
  •  
    Dense Fog Advisory until December 25, 10:00am

    NOW until 10:00am Thu

    Dense Fog Advisory

  • Overnight

    Low: 26 °F

    Areas Dense
    Freezing Fog

  • Christmas Day

    Christmas Day: Widespread dense freezing fog before noon. Cloudy, with a high near 40. South wind 7 to 17 mph, with gusts as high as 28 mph.

    High: 40 °F

    Dense
    Freezing Fog
    then Cloudy

  • Thursday Night

    Thursday Night: Widespread fog, mainly between 1am and 4am. Otherwise, mostly cloudy, with a low around 27. South wind 6 to 14 mph becoming northwest after midnight. Winds could gust as high as 25 mph.

    Low: 27 °F

    Mostly Cloudy
    then Fog

  • Friday

    Friday: Patchy fog between 8am and 10am. Otherwise, mostly sunny, with a high near 38. North northwest wind 5 to 7 mph becoming light and variable.

    High: 38 °F

    Patchy Fog
    then Mostly
    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 31. South southeast wind 7 to 10 mph.

    Low: 31 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 45. South wind around 10 mph becoming northwest in the afternoon.

    High: 45 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A slight chance of snow after midnight. Mostly cloudy, with a low around 10. Blustery, with a north northwest wind 9 to 14 mph increasing to 15 to 20 mph after midnight. Winds could gust as high as 32 mph. Chance of precipitation is 20%.

    Low: 10 °F

    Mostly Cloudy
    then Slight
    Chance Snow
    and Blustery

  • Sunday

    Sunday: A slight chance of snow before noon. Mostly cloudy, with a high near 15. Blustery, with a northwest wind 20 to 24 mph, with gusts as high as 40 mph. Chance of precipitation is 20%.

    High: 15 °F

    Blustery.
    Slight Chance
    Snow then
    Mostly Cloudy

Detailed Forecast

Overnight
Areas of dense freezing fog. Mostly cloudy, with a steady temperature around 26. East southeast wind around 7 mph.
Christmas Day
Widespread dense freezing fog before noon. Cloudy, with a high near 40. South wind 7 to 17 mph, with gusts as high as 28 mph.
Thursday Night
Widespread fog, mainly between 1am and 4am. Otherwise, mostly cloudy, with a low around 27. South wind 6 to 14 mph becoming northwest after midnight. Winds could gust as high as 25 mph.
Friday
Patchy fog between 8am and 10am. Otherwise, mostly sunny, with a high near 38. North northwest wind 5 to 7 mph becoming light and variable.
Friday Night
Mostly cloudy, with a low around 31. South southeast wind 7 to 10 mph.
Saturday
Mostly sunny, with a high near 45. South wind around 10 mph becoming northwest in the afternoon.
Saturday Night
A slight chance of snow after midnight. Mostly cloudy, with a low around 10. Blustery, with a north northwest wind 9 to 14 mph increasing to 15 to 20 mph after midnight. Winds could gust as high as 32 mph. Chance of precipitation is 20%.
Sunday
A slight chance of snow before noon. Mostly cloudy, with a high near 15. Blustery, with a northwest wind 20 to 24 mph, with gusts as high as 40 mph. Chance of precipitation is 20%.
Sunday Night
Mostly cloudy, with a low around 0. Blustery, with a northwest wind 15 to 22 mph, with gusts as high as 36 mph.
Monday
Sunny, with a high near 16.
Monday Night
Mostly cloudy, with a low around 8.
Tuesday
Partly sunny, with a high near 34.
Tuesday Night
Mostly cloudy, with a low around 13.
Wednesday
Mostly cloudy, with a high near 24.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Watertown SD
 44.91°N 97.14°W (Elev. 1736 ft)
Last Update:
4:36 am CST Dec 25, 2025
Forecast Valid:
4am CST Dec 25, 2025-6pm CST Dec 31, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

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Chance of Precipitation