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

Early Spring Heat Wave in the Southwest U.S.; Critical Fire Weather in the Central Rockies and Plains

An unusual early Spring heat wave will continue much above-normal temperatures over the Southwest U.S. through early next week. Many locations are likely to set records for the highest-ever March temperature. Periods of critical fire weather will persist from the central Rockies to the central Plains through Saturday as gusty winds and low relative humidity continue. 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: Mostly cloudy, with a high near 75. Southwest wind around 16 mph, with gusts as high as 23 mph.

    High: 75 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 52. Southwest wind 9 to 14 mph, with gusts as high as 23 mph.

    Low: 52 °F

    Mostly Cloudy

  • Friday

    Friday: Increasing clouds, with a high near 75. South wind 9 to 18 mph, with gusts as high as 25 mph.

    High: 75 °F

    Increasing
    Clouds

  • Friday Night

    Friday Night: Cloudy, with a low around 48. West wind 8 to 16 mph, with gusts as high as 24 mph.

    Low: 48 °F

    Cloudy

  • Saturday

    Saturday: A 20 percent chance of rain before 11am. Mostly sunny, with a high near 62. West wind 8 to 10 mph.

    High: 62 °F

    Slight Chance
    Rain then
    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 33.

    Low: 33 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 59.

    High: 59 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 38.

    Low: 38 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 60.

    High: 60 °F

    Mostly Cloudy

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 75. Southwest wind around 16 mph, with gusts as high as 23 mph.
Tonight
Mostly cloudy, with a low around 52. Southwest wind 9 to 14 mph, with gusts as high as 23 mph.
Friday
Increasing clouds, with a high near 75. South wind 9 to 18 mph, with gusts as high as 25 mph.
Friday Night
Cloudy, with a low around 48. West wind 8 to 16 mph, with gusts as high as 24 mph.
Saturday
A 20 percent chance of rain before 11am. Mostly sunny, with a high near 62. West wind 8 to 10 mph.
Saturday Night
Mostly clear, with a low around 33.
Sunday
Mostly sunny, with a high near 59.
Sunday Night
Mostly cloudy, with a low around 38.
Monday
Mostly cloudy, with a high near 60.
Monday Night
Mostly cloudy, with a low around 43.
Tuesday
A chance of rain. Mostly cloudy, with a high near 63.
Tuesday Night
A chance of rain and snow. Mostly cloudy, with a low around 40.
Wednesday
A slight chance of rain and snow. Mostly sunny, with a high near 58.
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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:
2:07 pm PDT Mar 19, 2026
Forecast Valid:
2pm PDT Mar 19, 2026-6pm PDT Mar 25, 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