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

91°F

33°C

Humidity 24%
Wind Speed N 0 MPH
Barometer 29.88 in (1011.85 mb)
Dewpoint 49°F (9°C)
Visibility 10.00 mi
Heat Index88°F (31°C)
Last update 19 Aug 04:15 PM PDT
Extended Forecast for

17 Miles SE Mattawa WA

  • Tonight

    Tonight: Mostly clear, with a low around 62. East wind around 5 mph becoming light and variable after midnight.

    Low: 62 °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 65. South wind around 6 mph becoming light and variable after midnight.

    Low: 65 °F

    Increasing
    Clouds

  • Friday

    Friday: Partly sunny and hot, with a high near 98. Light and variable wind becoming north around 5 mph in the afternoon.

    High: 98 °F

    Hot

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms after 11pm. Mostly cloudy, with a low around 69. West wind 6 to 8 mph.

    Low: 69 °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
    Mostly 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 58.

    Low: 58 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 62. East wind around 5 mph becoming light and variable 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 65. South wind around 6 mph becoming light and variable after midnight.
Friday
Partly sunny and hot, with a high near 98. Light and variable wind becoming north around 5 mph in the afternoon.
Friday Night
A 20 percent chance of showers and thunderstorms after 11pm. Mostly cloudy, with a low around 69. West wind 6 to 8 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 58.
Monday
Sunny, with a high near 91.
Monday Night
Mostly clear, with a low around 62.
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
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ABOUT THIS FORECAST

 
Point Forecast:
17 Miles SE Mattawa WA
 46.59°N 119.64°W (Elev. 600 ft)
Last Update:
3:00 pm PDT Aug 19, 2026
Forecast Valid:
4pm PDT Aug 19, 2026-6pm PDT Aug 26, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation