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

  • Tonight

    Tonight: Mostly cloudy, with a low around 46. South wind 8 to 10 mph.

    Low: 46 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 72. Southwest wind 9 to 14 mph, with gusts as high as 21 mph.

    High: 72 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: 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 75. Southwest wind 7 to 14 mph, with gusts as high as 21 mph.

    High: 75 °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 20 mph.

    Low: 51 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 74.

    High: 74 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: A 20 percent chance of rain. Mostly cloudy, with a low around 44.

    Low: 44 °F

    Slight Chance
    Rain

  • Saturday

    Saturday: Mostly sunny, with a high near 60.

    High: 60 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 34.

    Low: 34 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 46. South wind 8 to 10 mph.
Wednesday
Mostly cloudy, with a high near 72. Southwest wind 9 to 14 mph, with gusts as high as 21 mph.
Wednesday Night
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 75. Southwest wind 7 to 14 mph, with gusts as high as 21 mph.
Thursday Night
Mostly cloudy, with a low around 51. West wind 7 to 14 mph, with gusts as high as 20 mph.
Friday
Mostly cloudy, with a high near 74.
Friday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 44.
Saturday
Mostly sunny, with a high near 60.
Saturday Night
Partly cloudy, with a low around 34.
Sunday
Mostly sunny, with a high near 59.
Sunday Night
Partly cloudy, with a low around 36.
Monday
Partly sunny, with a high near 60.
Monday Night
A slight chance of rain. Mostly cloudy, with a low around 41.
Tuesday
A chance of rain. Mostly cloudy, with a high near 60.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Prosser WA
 46.21°N 119.75°W (Elev. 741 ft)
Last Update:
4:15 pm PDT Mar 17, 2026
Forecast Valid:
7pm PDT Mar 17, 2026-6pm PDT Mar 24, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation