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Record Warmth Lingers; Fire Weather Concerns; Unsettled Pacific Northwest

More record warm temperatures are forecast this week from California, Southwest, Plains then into the Mississippi Valley and Southeast. The warmth combining with dry conditions may result in elevated to locally critical fire weather conditions. Meanwhile, another Pacific system will move across the Pacific Northwest with lower elevation rain and mountain snows. For Hawaii, conditions improving. 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: Partly sunny, with a high near 59. Southeast wind around 5 mph.

    High: 59 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 37. East wind around 5 mph becoming light and variable.

    Low: 37 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 63. West wind around 5 mph becoming light and variable.

    High: 63 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 46. South wind around 6 mph.

    Low: 46 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Rain likely, mainly after 11am. Mostly cloudy, with a high near 61. South wind 6 to 14 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    High: 61 °F

    Rain Likely

  • Tuesday Night

    Tuesday Night: A 30 percent chance of rain before 11pm. Mostly cloudy, with a low around 42.

    Low: 42 °F

    Chance Rain
    then Mostly
    Cloudy

  • Wednesday

    Wednesday: A 20 percent chance of rain. Mostly sunny, with a high near 60.

    High: 60 °F

    Slight Chance
    Rain

  • Wednesday Night

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

    Low: 33 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 57.

    High: 57 °F

    Sunny

Detailed Forecast

This Afternoon
Partly sunny, with a high near 59. Southeast wind around 5 mph.
Tonight
Mostly cloudy, with a low around 37. East wind around 5 mph becoming light and variable.
Monday
Partly sunny, with a high near 63. West wind around 5 mph becoming light and variable.
Monday Night
Mostly cloudy, with a low around 46. South wind around 6 mph.
Tuesday
Rain likely, mainly after 11am. Mostly cloudy, with a high near 61. South wind 6 to 14 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday Night
A 30 percent chance of rain before 11pm. Mostly cloudy, with a low around 42.
Wednesday
A 20 percent chance of rain. Mostly sunny, with a high near 60.
Wednesday Night
Mostly clear, with a low around 33.
Thursday
Sunny, with a high near 57.
Thursday Night
Mostly clear, with a low around 33.
Friday
Sunny, with a high near 60.
Friday Night
Partly cloudy, with a low around 37.
Saturday
Mostly sunny, with a high near 64.
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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:
10:15 am PDT Mar 22, 2026
Forecast Valid:
1pm PDT Mar 22, 2026-6pm PDT Mar 28, 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