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

Heat the Southwest; Fire Weather in the Central U.S.; Kona Low Impacting Hawaii

A rare March heat wave is ongoing with much above-normal temperatures over the Southwest U.S. through this weekend. Periods of critical fire weather will persist from the central Rockies to the central and southern Plains through the weekend as gusty winds and low relative humidity continue. A Kona low will continue to bring several rounds of moderate to heavy rainfall to Hawaii through Sunday. Read More >

Hazardous Weather Conditions

Current conditions at

Sunnyside Municipal Airport (K1S5)

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

Clear

N/A

Humidity 87%
Wind Speed N 0 MPH
Barometer NA
Dewpoint N/A
Visibility 10.00 mi
Last update 10 Mar 07:35 AM PDT
Extended Forecast for

11 Miles SE Mattawa WA

  • Tonight

    Tonight: A 20 percent chance of rain before 2am. Cloudy, with a low around 45. Northwest wind around 10 mph.

    Low: 45 °F

    Slight Chance
    Rain

  • Saturday

    Saturday: Partly sunny, then gradually becoming sunny, with a high near 61. Northwest wind 9 to 13 mph, with gusts as high as 21 mph.

    High: 61 °F

    Becoming
    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 34. West wind 8 to 11 mph, with gusts as high as 18 mph.

    Low: 34 °F

    Clear

  • Sunday

    Sunday: Increasing clouds, with a high near 60. West wind around 6 mph becoming south in the afternoon.

    High: 60 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 37. Southeast wind around 5 mph becoming light and variable.

    Low: 37 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 61.

    High: 61 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 43.

    Low: 43 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 30 percent chance of rain, mainly after 11am. Mostly cloudy, with a high near 63.

    High: 63 °F

    Chance Rain

  • Tuesday Night

    Tuesday Night: A 30 percent chance of rain, mainly before 11pm. Mostly cloudy, with a low around 42.

    Low: 42 °F

    Chance Rain

Detailed Forecast

Tonight
A 20 percent chance of rain before 2am. Cloudy, with a low around 45. Northwest wind around 10 mph.
Saturday
Partly sunny, then gradually becoming sunny, with a high near 61. Northwest wind 9 to 13 mph, with gusts as high as 21 mph.
Saturday Night
Clear, with a low around 34. West wind 8 to 11 mph, with gusts as high as 18 mph.
Sunday
Increasing clouds, with a high near 60. West wind around 6 mph becoming south in the afternoon.
Sunday Night
Mostly cloudy, with a low around 37. Southeast wind around 5 mph becoming light and variable.
Monday
Mostly cloudy, with a high near 61.
Monday Night
Mostly cloudy, with a low around 43.
Tuesday
A 30 percent chance of rain, mainly after 11am. Mostly cloudy, with a high near 63.
Tuesday Night
A 30 percent chance of rain, mainly before 11pm. Mostly cloudy, with a low around 42.
Wednesday
Mostly sunny, with a high near 61.
Wednesday Night
Mostly clear, with a low around 34.
Thursday
Sunny, with a high near 58.
Thursday Night
Mostly clear, with a low around 34.
Friday
Sunny, with a high near 62.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
11 Miles SE Mattawa WA
 46.64°N 119.74°W (Elev. 400 ft)
Last Update:
10:15 pm PDT Mar 20, 2026
Forecast Valid:
10pm PDT Mar 20, 2026-6pm PDT Mar 27, 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