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

Sunnyside Municipal Airport (K1S5)

Lat: 46.3271°NLon: 119.9704°WElev: 768.0ft.

Fog

32°F

0°C

Humidity 98%
Wind Speed N 0 MPH
Barometer 29.69 in (1005.42 mb)
Dewpoint 32°F (0°C)
Visibility 0.25 mi
Last update 26 Dec 12:55 AM PST
Extended Forecast for

Prosser WA

  • Overnight

    Overnight: Rain likely. Cloudy, with a low around 34. Light southwest wind. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 34 °F

    Rain Likely

  • Friday

    Friday: Rain likely before 10am, then a chance of rain after 1pm. Mostly cloudy, with a high near 48. Southwest wind 7 to 16 mph, with gusts as high as 23 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 48 °F

    Rain Likely
    then Chance
    Rain

  • Friday Night

    Friday Night: A chance of rain before 10pm, then a slight chance of rain and snow between 10pm and 1am, then a slight chance of snow after 1am. Snow level 1300 feet lowering to 600 feet after midnight . Partly cloudy, with a low around 29. Southwest wind 13 to 15 mph, with gusts as high as 29 mph. Chance of precipitation is 30%.

    Low: 29 °F

    Chance
    Rain/Snow

  • Saturday

    Saturday: Sunny, with a high near 43. Northwest wind around 8 mph.

    High: 43 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 24. Light and variable wind.

    Low: 24 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 37.

    High: 37 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 22.

    Low: 22 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 35.

    High: 35 °F

    Partly Sunny

  • Monday Night

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

    Low: 23 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Rain likely. Cloudy, with a low around 34. Light southwest wind. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Friday
Rain likely before 10am, then a chance of rain after 1pm. Mostly cloudy, with a high near 48. Southwest wind 7 to 16 mph, with gusts as high as 23 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
A chance of rain before 10pm, then a slight chance of rain and snow between 10pm and 1am, then a slight chance of snow after 1am. Snow level 1300 feet lowering to 600 feet after midnight . Partly cloudy, with a low around 29. Southwest wind 13 to 15 mph, with gusts as high as 29 mph. Chance of precipitation is 30%.
Saturday
Sunny, with a high near 43. Northwest wind around 8 mph.
Saturday Night
Mostly cloudy, with a low around 24. Light and variable wind.
Sunday
Mostly sunny, with a high near 37.
Sunday Night
Partly cloudy, with a low around 22.
Monday
Partly sunny, with a high near 35.
Monday Night
Mostly cloudy, with a low around 23.
Tuesday
Mostly cloudy, with a high near 36.
Tuesday Night
Mostly cloudy, with a low around 24.
Wednesday
Mostly cloudy, with a high near 39.
Wednesday Night
A slight chance of snow. Mostly cloudy, with a low around 27.
New Year's Day
A slight chance of rain and snow. Mostly cloudy, with a high near 42.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Prosser WA
 46.2°N 119.78°W (Elev. 646 ft)
Last Update:
12:46 am PST Dec 26, 2025
Forecast Valid:
1am PST Dec 26, 2025-6pm PST Jan 1, 2026
 
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Additional Resources

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High Temperature

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Chance of Precipitation