Another Arctic Blast in the East; Eastern U.S. Winter Storm

A powerful Arctic blast will bring dangerously cold, record low temperatures to the upper Ohio Valley, Mid-Atlantic, Gulf Coast and Southeast U.S. this weekend. A rapidly deepening storm will produce widespread heavy snow and wind from the southern Appalachians across the Carolinas and southern Virginia into Sunday. Storm-force winds and coastal flooding will be possible along the East Coast. Read More >

Current conditions at

Sunnyside Municipal Airport (K1S5)

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

Fog

34°F

1°C

Humidity 99%
Wind Speed N 0 MPH
Barometer 30.3 in (1026.08 mb)
Dewpoint 34°F (1°C)
Visibility 0.25 mi
Last update 31 Jan 07:55 AM PST
Extended Forecast for

11 Miles SSW Mattawa WA

Dense Fog Advisory until January 31, 10:00am
Click here for hazard details and duration
...
  •  
    Dense Fog Advisory until January 31, 10:00am

    NOW until 10:00am Sat

    Dense Fog Advisory

  • Today

    High: 42 °F

    Patchy Dense
    Fog

  • Tonight

    Tonight: Mostly cloudy, with a low around 35. Southwest wind around 6 mph becoming northwest after midnight.

    Low: 35 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy, then gradually becoming sunny, with a high near 46. West wind 6 to 11 mph becoming southwest in the morning. Winds could gust as high as 18 mph.

    High: 46 °F

    Decreasing
    Clouds

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 34. West wind 10 to 13 mph.

    Low: 34 °F

    Partly Cloudy

  • Monday

    Monday: A 20 percent chance of rain after 10am.  Mostly cloudy, with a high near 45. South wind 6 to 9 mph.

    High: 45 °F

    Slight Chance
    Rain

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 34.

    Low: 34 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 44.

    High: 44 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 35.

    Low: 35 °F

    Mostly Cloudy

Detailed Forecast

Today
Patchy dense fog before 1pm. Otherwise, mostly cloudy, with a high near 42. West wind around 7 mph becoming east in the afternoon.
Tonight
Mostly cloudy, with a low around 35. Southwest wind around 6 mph becoming northwest after midnight.
Sunday
Mostly cloudy, then gradually becoming sunny, with a high near 46. West wind 6 to 11 mph becoming southwest in the morning. Winds could gust as high as 18 mph.
Sunday Night
Partly cloudy, with a low around 34. West wind 10 to 13 mph.
Monday
A 20 percent chance of rain after 10am. Mostly cloudy, with a high near 45. South wind 6 to 9 mph.
Monday Night
Mostly cloudy, with a low around 34.
Tuesday
Mostly cloudy, with a high near 44.
Tuesday Night
Mostly cloudy, with a low around 35.
Wednesday
Partly sunny, with a high near 45.
Wednesday Night
Partly cloudy, with a low around 33.
Thursday
Mostly sunny, with a high near 46.
Thursday Night
Partly cloudy, with a low around 33.
Friday
Mostly sunny, with a high near 46.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
11 Miles SSW Mattawa WA
 46.59°N 119.98°W (Elev. 3100 ft)
5:42 am PST Jan 31, 2026
8am PST Jan 31, 2026-6pm PST Feb 6, 2026
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database