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

Tracking Late Season Winter Storms

A moderate atmospheric river will continue to bring heavy snow over the Olympics, northern Cascades and northern Rockies Friday while heavy rain may bring flooding to coastal Oregon and Washington. A winter storm will continue to push across the Great Lakes and Northeast U.S. Friday and Saturday with areas of heavy snow and high winds. Read More >

Current conditions at

Sunnyside Municipal Airport (K1S5)

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

Clear

23°F

-5°C

Humidity 87%
Wind Speed N 0 MPH
Barometer 30.11 in (1019.64 mb)
Dewpoint 20°F (-7°C)
Visibility 10.00 mi
Last update 10 Mar 07:35 AM PDT
Extended Forecast for

Prosser WA

  • Tonight

    Tonight: Rain, mainly after 2am. Low around 42. West wind 13 to 18 mph becoming south 6 to 11 mph after midnight. Winds could gust as high as 28 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 42 °F

    Chance Rain
    then Rain

  • Friday

    Friday: Rain. High near 54. East wind 6 to 9 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    High: 54 °F

    Rain

  • Friday Night

    Friday Night: Rain likely. Cloudy, with a low around 37. East wind around 9 mph becoming west after midnight. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 37 °F

    Rain Likely

  • Saturday

    Saturday: A slight chance of rain, mixing with snow after 8am, then gradually ending. Snow level 2600 feet lowering to 900 feet. Mostly sunny, with a high near 53. West wind 9 to 16 mph, with gusts as high as 23 mph. Chance of precipitation is 20%.

    High: 53 °F

    Slight Chance
    Rain/Snow
    then Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 31. Northwest wind 5 to 14 mph, with gusts as high as 18 mph.

    Low: 31 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 50.

    High: 50 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: A 20 percent chance of rain before 11pm. Mostly cloudy, with a low around 38.

    Low: 38 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 67.

    High: 67 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 42.

    Low: 42 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Rain, mainly after 2am. Low around 42. West wind 13 to 18 mph becoming south 6 to 11 mph after midnight. Winds could gust as high as 28 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Friday
Rain. High near 54. East wind 6 to 9 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
Rain likely. Cloudy, with a low around 37. East wind around 9 mph becoming west after midnight. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
A slight chance of rain, mixing with snow after 8am, then gradually ending. Snow level 2600 feet lowering to 900 feet. Mostly sunny, with a high near 53. West wind 9 to 16 mph, with gusts as high as 23 mph. Chance of precipitation is 20%.
Saturday Night
Mostly cloudy, with a low around 31. Northwest wind 5 to 14 mph, with gusts as high as 18 mph.
Sunday
Mostly cloudy, with a high near 50.
Sunday Night
A 20 percent chance of rain before 11pm. Mostly cloudy, with a low around 38.
Monday
Mostly cloudy, with a high near 67.
Monday Night
Mostly cloudy, with a low around 42.
Tuesday
Mostly cloudy, with a high near 72.
Tuesday Night
Mostly cloudy, with a low around 47.
Wednesday
A slight chance of rain. Mostly cloudy, with a high near 72.
Wednesday Night
A slight chance of rain. Mostly cloudy, with a low around 49.
Thursday
Mostly cloudy, with a high near 71.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Prosser WA
 46.21°N 119.75°W (Elev. 741 ft)
Last Update:
4:16 pm PDT Mar 12, 2026
Forecast Valid:
7pm PDT Mar 12, 2026-6pm PDT Mar 19, 2026
 
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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