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

Sunnyside Municipal Airport (K1S5)

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

Clear

89°F

32°C

Humidity 40%
Wind Speed N 0 MPH
Barometer 29.86 in (1011.18 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 19 Aug 05:35 PM PDT
Extended Forecast for

19 Miles ESE Mattawa WA

  • Tonight

    Tonight: Mostly clear, with a low around 61. East wind around 5 mph becoming calm after midnight.

    Low: 61 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 98. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 98 °F

    Hot

  • Thursday Night

    Thursday Night: Increasing clouds, with a low around 64. South wind around 6 mph becoming light and variable after midnight.

    Low: 64 °F

    Increasing
    Clouds

  • Friday

    Friday: Partly sunny and hot, with a high near 99. North wind 3 to 5 mph.

    High: 99 °F

    Hot

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms after 11pm. Mostly cloudy, with a low around 68. West wind around 7 mph.

    Low: 68 °F

    Slight Chance
    T-storms

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms before 11am. Mostly sunny, with a high near 95.

    High: 95 °F

    Slight Chance
    T-storms then
    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 58.

    Low: 58 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 57.

    Low: 57 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 61. East wind around 5 mph becoming calm after midnight.
Thursday
Sunny and hot, with a high near 98. Calm wind becoming southeast around 5 mph in the afternoon.
Thursday Night
Increasing clouds, with a low around 64. South wind around 6 mph becoming light and variable after midnight.
Friday
Partly sunny and hot, with a high near 99. North wind 3 to 5 mph.
Friday Night
A 20 percent chance of showers and thunderstorms after 11pm. Mostly cloudy, with a low around 68. West wind around 7 mph.
Saturday
A 20 percent chance of showers and thunderstorms before 11am. Mostly sunny, with a high near 95.
Saturday Night
Mostly clear, with a low around 58.
Sunday
Sunny, with a high near 88.
Sunday Night
Mostly clear, with a low around 57.
Monday
Sunny, with a high near 91.
Monday Night
Mostly clear, with a low around 61.
Tuesday
Mostly sunny, with a high near 94.
Tuesday Night
Mostly clear, with a low around 61.
Wednesday
Mostly sunny, with a high near 91.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
19 Miles ESE Mattawa WA
 46.59°N 119.58°W (Elev. 600 ft)
Last Update:
3:00 pm PDT Aug 19, 2026
Forecast Valid:
5pm PDT Aug 19, 2026-6pm PDT Aug 26, 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