Tracking Late Season Winter Storms; Unusual Early-Season Heat Wave in the Southwest

Heavy snow and high winds continue in the Great Lakes and Northeast. A moderate atmospheric river will continue to bring heavy precipitation to the Pacific Northwest and northern Rockies. A major winter storm will develop across the northern High Plains tonight into Saturday and rapidly strengthen as it moves into the Great Lakes on Sunday. Above-average temperatures expected in the Southwest. Read More >

Current conditions at

Sunnyside Municipal Airport (K1S5)

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

Clear

N/A

Humidity 87%
Wind Speed N 0 MPH
Barometer NA
Dewpoint N/A
Visibility 10.00 mi
Last update 10 Mar 07:35 AM PDT
Extended Forecast for

Prosser WA

  • Overnight

    Overnight: Rain likely, mainly before 2am.  Cloudy, then gradually becoming partly cloudy, with a low around 37. West wind around 7 mph.  Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 37 °F

    Rain Likely

  • Saturday

    Saturday: Mostly sunny, with a high near 50. West wind 7 to 16 mph, with gusts as high as 24 mph.

    High: 50 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 30. Northwest wind 8 to 13 mph becoming light west  after midnight. Winds could gust as high as 21 mph.

    Low: 30 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 51. Light and variable wind.

    High: 51 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: A 20 percent chance of rain before 11pm.  Cloudy, with a low around 38. Southeast wind around 5 mph becoming calm  in the evening.

    Low: 38 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 65.

    High: 65 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 45.

    Low: 45 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of rain after 11am.  Mostly cloudy, with a high near 71.

    High: 71 °F

    Slight Chance
    Rain

  • Tuesday Night

    Tuesday Night: A 20 percent chance of rain before 11pm.  Mostly cloudy, with a low around 48.

    Low: 48 °F

    Slight Chance
    Rain then
    Mostly Cloudy

Detailed Forecast

Overnight
Rain likely, mainly before 2am. Cloudy, then gradually becoming partly cloudy, with a low around 37. West wind around 7 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
Mostly sunny, with a high near 50. West wind 7 to 16 mph, with gusts as high as 24 mph.
Saturday Night
Mostly cloudy, with a low around 30. Northwest wind 8 to 13 mph becoming light west after midnight. Winds could gust as high as 21 mph.
Sunday
Mostly cloudy, with a high near 51. Light and variable wind.
Sunday Night
A 20 percent chance of rain before 11pm. Cloudy, with a low around 38. Southeast wind around 5 mph becoming calm in the evening.
Monday
Mostly cloudy, with a high near 65.
Monday Night
Mostly cloudy, with a low around 45.
Tuesday
A 20 percent chance of rain after 11am. Mostly cloudy, with a high near 71.
Tuesday Night
A 20 percent chance of rain before 11pm. Mostly cloudy, with a low around 48.
Wednesday
Partly sunny, with a high near 72.
Wednesday Night
Mostly cloudy, with a low around 51.
Thursday
Mostly cloudy, with a high near 74.
Thursday Night
A slight chance of rain. Mostly cloudy, with a low around 49.
Friday
Partly sunny, with a high near 73.
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ABOUT THIS FORECAST

 
Point Forecast:
Prosser WA
 46.22°N 119.79°W (Elev. 715 ft)
12:50 am PDT Mar 14, 2026
1am PDT Mar 14, 2026-6pm PDT Mar 20, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database