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

Heat Wave Continues in the West; Critical Fire Weather Conditions in the High Plains

An anomalously early heat wave will continue to intensify and expand across the West and Southwest as the week progresses. Numerous daily and potentially monthly record highs are expected to be broken. Critical fire weather conditions will continue over the next couple of days across portions of the High Plains as gusty winds and dry conditions persist. 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

  • Today

    Today: Mostly cloudy, with a high near 74. Southwest wind 9 to 14 mph, with gusts as high as 22 mph.

    High: 74 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 51. Southwest wind 7 to 11 mph, with gusts as high as 18 mph.

    Low: 51 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 72. Southwest wind 7 to 15 mph, with gusts as high as 22 mph.

    High: 72 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 51. West wind 7 to 14 mph, with gusts as high as 22 mph.

    Low: 51 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 71. Southwest wind 7 to 16 mph, with gusts as high as 24 mph.

    High: 71 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 43.

    Low: 43 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 59.

    High: 59 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 33.

    Low: 33 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 59.

    High: 59 °F

    Sunny

Detailed Forecast

Today
Mostly cloudy, with a high near 74. Southwest wind 9 to 14 mph, with gusts as high as 22 mph.
Tonight
Mostly cloudy, with a low around 51. Southwest wind 7 to 11 mph, with gusts as high as 18 mph.
Thursday
Mostly cloudy, with a high near 72. Southwest wind 7 to 15 mph, with gusts as high as 22 mph.
Thursday Night
Mostly cloudy, with a low around 51. West wind 7 to 14 mph, with gusts as high as 22 mph.
Friday
Mostly cloudy, with a high near 71. Southwest wind 7 to 16 mph, with gusts as high as 24 mph.
Friday Night
Mostly cloudy, with a low around 43.
Saturday
Mostly sunny, with a high near 59.
Saturday Night
Partly cloudy, with a low around 33.
Sunday
Sunny, with a high near 59.
Sunday Night
Partly cloudy, with a low around 36.
Monday
Mostly cloudy, with a high near 58.
Monday Night
Mostly cloudy, with a low around 40.
Tuesday
A chance of rain. Mostly cloudy, with a high near 58.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Prosser WA
 46.2°N 119.78°W (Elev. 646 ft)
Last Update:
4:20 am PDT Mar 18, 2026
Forecast Valid:
5am PDT Mar 18, 2026-6pm PDT Mar 24, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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Chance of Precipitation