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Flooding Risks from Tropical Moisture Across the Intermountain West and East Coast

Tropical moisture from Isaias and Rachel will impact portions of the Intermountain West and East Coast states. Flooding, gusty winds and even a threat for severe thunderstorms and tornadoes are possible. Meanwhile, record warmth will spread northward across the Mississippi Valley the next few days. Looking for snow, the first winter storm of the season is underway across the northern Rockies. Read More >

Current conditions at

Sunnyside Municipal Airport (K1S5)

Lat: 46.3271°NLon: 119.9704°WElev: 768.0ft.

Mostly Cloudy

51°F

11°C

Humidity 61%
Wind Speed W 3 MPH
Barometer 29.87 in (1011.51 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Last update 11 Oct 05:15 AM PDT
Extended Forecast for

Prosser WA

  • Today

    Today: Sunny, with a high near 60. North wind 8 to 13 mph, with gusts as high as 23 mph.

    High: 60 °F

    Sunny

  • Tonight

    Tonight: Areas of frost after 5am. Otherwise, mostly clear, with a low around 36. Northeast wind around 6 mph becoming calm in the evening.

    Low: 36 °F

    Partly Cloudy
    then Areas
    Frost

  • Columbus Day

    Columbus Day: Areas of frost before 11am. Otherwise, sunny, with a high near 63. Calm wind.

    High: 63 °F

    Areas Frost
    then Sunny

  • Monday Night

    Monday Night: Clear, with a low around 32. Calm wind.

    Low: 32 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 67. Calm wind.

    High: 67 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 38.

    Low: 38 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 71.

    High: 71 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 41.

    Low: 41 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 71.

    High: 71 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 60. North wind 8 to 13 mph, with gusts as high as 23 mph.
Tonight
Areas of frost after 5am. Otherwise, mostly clear, with a low around 36. Northeast wind around 6 mph becoming calm in the evening.
Columbus Day
Areas of frost before 11am. Otherwise, sunny, with a high near 63. Calm wind.
Monday Night
Clear, with a low around 32. Calm wind.
Tuesday
Sunny, with a high near 67. Calm wind.
Tuesday Night
Mostly clear, with a low around 38.
Wednesday
Mostly sunny, with a high near 71.
Wednesday Night
Mostly clear, with a low around 41.
Thursday
Sunny, with a high near 71.
Thursday Night
Mostly clear, with a low around 41.
Friday
Sunny, with a high near 72.
Friday Night
Mostly clear, with a low around 41.
Saturday
Mostly sunny, with a high near 71.
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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:
4:00 am PDT Oct 11, 2026
Forecast Valid:
5am PDT Oct 11, 2026-6pm PDT Oct 17, 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