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

Dangerous Heat and Possible Flooding

Dangerous heat will persist across the Southwest U.S. through Saturday with daytime highs of 110-115°F. Extreme Heat Warnings remain in effect. Dangerous heat will build across the southern Plains again beginning this weekend. Heavy to excessive rain over the Carolinas Friday may lead to isolated areas of flash flooding. Read More >

Current conditions at

Sunnyside Municipal Airport (K1S5)

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

Clear

79°F

26°C

Humidity 32%
Wind Speed ENE 3 MPH
Barometer 29.93 in (1013.55 mb)
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 28 Aug 01:15 PM PDT
Extended Forecast for

Prosser WA

  • This Afternoon

    This Afternoon: Sunny, with a high near 85. Light northwest wind.

    High: 85 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 50. Southwest wind 3 to 7 mph.

    Low: 50 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 78. West wind 8 to 10 mph, with gusts as high as 18 mph.

    High: 78 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 44. West wind 5 to 9 mph becoming calm after midnight. Winds could gust as high as 18 mph.

    Low: 44 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 80. Light and variable wind.

    High: 80 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 48.

    Low: 48 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 87.

    High: 87 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 53.

    Low: 53 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 88.

    High: 88 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 85. Light northwest wind.
Tonight
Mostly clear, with a low around 50. Southwest wind 3 to 7 mph.
Saturday
Mostly sunny, with a high near 78. West wind 8 to 10 mph, with gusts as high as 18 mph.
Saturday Night
Partly cloudy, with a low around 44. West wind 5 to 9 mph becoming calm after midnight. Winds could gust as high as 18 mph.
Sunday
Sunny, with a high near 80. Light and variable wind.
Sunday Night
Mostly clear, with a low around 48.
Monday
Sunny, with a high near 87.
Monday Night
Partly cloudy, with a low around 53.
Tuesday
Mostly sunny, with a high near 88.
Tuesday Night
A slight chance of showers before 11pm. Partly cloudy, with a low around 52.
Wednesday
A chance of showers. Partly sunny, with a high near 79.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 46.
Thursday
A chance of showers. Partly sunny, with a high near 76.
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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:
11:46 am PDT Aug 28, 2026
Forecast Valid:
1pm PDT Aug 28, 2026-6pm PDT Sep 3, 2026
 
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Additional Resources

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