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

Early Heat Wave in the West; Fire Concerns in the 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. Elevated to critical fire weather conditions are expected today across the High Plains and southern Plains. Lake effect snow downwind of the Great Lakes will taper off today. 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

  • This Afternoon

    This Afternoon: A 20 percent chance of rain. Mostly cloudy, with a high near 71. Southwest wind around 13 mph, with gusts as high as 21 mph.

    High: 71 °F

    Slight Chance
    Rain

  • Tonight

    Tonight: Mostly cloudy, with a low around 47. Southwest wind 8 to 10 mph.

    Low: 47 °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 6 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 6 to 14 mph, with gusts as high as 20 mph.

    High: 75 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 52.

    Low: 52 °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

Detailed Forecast

This Afternoon
A 20 percent chance of rain. Mostly cloudy, with a high near 71. Southwest wind around 13 mph, with gusts as high as 21 mph.
Tonight
Mostly cloudy, with a low around 47. Southwest 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 6 to 11 mph, with gusts as high as 18 mph.
Thursday
Mostly cloudy, with a high near 75. Southwest wind 6 to 14 mph, with gusts as high as 20 mph.
Thursday Night
Mostly cloudy, with a low around 52.
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 37.
Monday
Partly sunny, with a high near 60.
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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:
2:30 pm PDT Mar 17, 2026
Forecast Valid:
2pm PDT Mar 17, 2026-6pm PDT Mar 23, 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