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

69°F

21°C

Humidity 60%
Wind Speed N 0 MPH
Barometer 29.87 in (1011.51 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 19 Aug 09:35 PM PDT
Extended Forecast for

16 Miles ESE Mattawa WA

  • Tonight

    Tonight: Mostly clear, with a low around 60. Light west wind.

    Low: 60 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 99. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 99 °F

    Hot

  • Thursday Night

    Thursday Night: Increasing clouds, with a low around 63. South wind around 6 mph becoming light and variable in the evening.

    Low: 63 °F

    Increasing
    Clouds

  • Friday

    Friday: Partly sunny and hot, with a high near 99. Calm wind becoming northeast around 5 mph in the afternoon.

    High: 99 °F

    Hot

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms after 11pm. Mostly cloudy, with a low around 67. West wind around 6 mph.

    Low: 67 °F

    Slight Chance
    T-storms

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms before 11am. Mostly sunny, with a high near 96.

    High: 96 °F

    Slight Chance
    T-storms then
    Sunny

  • Saturday Night

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

    Low: 57 °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 56.

    Low: 56 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 60. Light west wind.
Thursday
Sunny and hot, with a high near 99. Calm wind becoming southeast around 5 mph in the afternoon.
Thursday Night
Increasing clouds, with a low around 63. South wind around 6 mph becoming light and variable in the evening.
Friday
Partly sunny and hot, with a high near 99. Calm wind becoming northeast around 5 mph in the afternoon.
Friday Night
A 20 percent chance of showers and thunderstorms after 11pm. Mostly cloudy, with a low around 67. West wind around 6 mph.
Saturday
A 20 percent chance of showers and thunderstorms before 11am. Mostly sunny, with a high near 96.
Saturday Night
Mostly clear, with a low around 57.
Sunday
Sunny, with a high near 88.
Sunday Night
Mostly clear, with a low around 56.
Monday
Sunny, with a high near 91.
Monday Night
Mostly clear, with a low around 60.
Tuesday
Mostly sunny, with a high near 94.
Tuesday Night
Mostly clear, with a low around 60.
Wednesday
Mostly sunny, with a high near 91.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
16 Miles ESE Mattawa WA
 46.63°N 119.62°W (Elev. 505 ft)
Last Update:
3:00 pm PDT Aug 19, 2026
Forecast Valid:
9pm 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