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 >

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 SSW Mattawa WA

  • Tonight

    Tonight: Mostly clear, with a low around 31. West wind 13 to 16 mph, with gusts as high as 26 mph.

    Low: 31 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 49. West wind 7 to 10 mph becoming south in the morning.

    High: 49 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 35. South wind around 7 mph becoming northwest after midnight.

    Low: 35 °F

    Mostly Cloudy

  • Monday

    Monday: Increasing clouds, with a high near 53. Northwest wind 6 to 8 mph becoming south in the afternoon.

    High: 53 °F

    Increasing
    Clouds

  • Monday Night

    Monday Night: Cloudy, with a low around 43. South wind 6 to 8 mph becoming west in the evening.

    Low: 43 °F

    Cloudy

  • Tuesday

    Tuesday: Rain likely. Mostly cloudy, with a high near 52. Breezy. Chance of precipitation is 70%.

    High: 52 °F

    Rain Likely
    and Breezy

  • Tuesday Night

    Tuesday Night: A 30 percent chance of rain before 11pm. Mostly cloudy, with a low around 37. Windy.

    Low: 37 °F

    Chance Rain
    and Windy
    then Partly
    Cloudy and
    Breezy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 50. Breezy.

    High: 50 °F

    Mostly Sunny
    then Mostly
    Sunny and
    Breezy

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 32. Breezy.

    Low: 32 °F

    Mostly Clear
    and Breezy
    then Mostly
    Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 31. West wind 13 to 16 mph, with gusts as high as 26 mph.
Sunday
Sunny, with a high near 49. West wind 7 to 10 mph becoming south in the morning.
Sunday Night
Mostly cloudy, with a low around 35. South wind around 7 mph becoming northwest after midnight.
Monday
Increasing clouds, with a high near 53. Northwest wind 6 to 8 mph becoming south in the afternoon.
Monday Night
Cloudy, with a low around 43. South wind 6 to 8 mph becoming west in the evening.
Tuesday
Rain likely. Mostly cloudy, with a high near 52. Breezy. Chance of precipitation is 70%.
Tuesday Night
A 30 percent chance of rain before 11pm. Mostly cloudy, with a low around 37. Windy.
Wednesday
Mostly sunny, with a high near 50. Breezy.
Wednesday Night
Mostly clear, with a low around 32. Breezy.
Thursday
Sunny, with a high near 47.
Thursday Night
Mostly clear, with a low around 32.
Friday
Sunny, with a high near 50.
Friday Night
Mostly clear, with a low around 35.
Saturday
Mostly sunny, with a high near 54.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
11 Miles SSW Mattawa WA
 46.59°N 119.98°W (Elev. 3100 ft)
Last Update:
11:02 pm PDT Mar 21, 2026
Forecast Valid:
11pm PDT Mar 21, 2026-6pm PDT Mar 28, 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