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

Rapid Warm-Up Forecast Across Much of the Lower 48 Today and Tuesday

Most of the U.S. starts the week calm and unseasonably warm. The Heartland will be warmest, with highs 25–30° above average. Only the Gulf Coast stays chilly. Rain today is limited to western Washington while lake effect snow continues east of Lake Ontario. Cooler air returns after Tuesday, bringing a wintry mix to the Midwest and Northeast by Wednesday. Read More >

Hazardous Weather Conditions

Current conditions at

Sunnyside Municipal Airport (K1S5)

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

Clear

47°F

8°C

Humidity 74%
Wind Speed NNW 3 MPH
Barometer 30.28 in (1025.4 mb)
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Last update 12 Jan 05:35 PM PST
Extended Forecast for

16 Miles ESE Mattawa WA

Air Stagnation Advisory January 13, 07:00am until January 16, 07:00am
Click here for hazard details and duration
Air Stagnation Advisory

  • Tonight

    Tonight: Patchy dense fog after 4am. Otherwise, mostly cloudy, with a low around 35. South wind around 5 mph becoming light and variable in the evening.

    Low: 35 °F

    Mostly Cloudy
    then Patchy
    Dense Fog

  • Tuesday

    Tuesday: Patchy dense fog before 7am. Otherwise, mostly cloudy, with a high near 49. Calm wind.

    High: 49 °F

    Patchy Dense
    Fog then
    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Patchy dense fog between 1am and 4am. Otherwise, partly cloudy, with a low around 32. Light northwest wind.

    Low: 32 °F

    Partly Cloudy
    then Patchy
    Dense Fog

  • Wednesday

    Wednesday: Patchy dense fog between 7am and 10am. Otherwise, partly sunny, with a high near 46. Calm wind.

    High: 46 °F

    Patchy Dense
    Fog then
    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 31. Light northwest wind.

    Low: 31 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 46.

    High: 46 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 29.

    Low: 29 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 43.

    High: 43 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 28.

    Low: 28 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Patchy dense fog after 4am. Otherwise, mostly cloudy, with a low around 35. South wind around 5 mph becoming light and variable in the evening.
Tuesday
Patchy dense fog before 7am. Otherwise, mostly cloudy, with a high near 49. Calm wind.
Tuesday Night
Patchy dense fog between 1am and 4am. Otherwise, partly cloudy, with a low around 32. Light northwest wind.
Wednesday
Patchy dense fog between 7am and 10am. Otherwise, partly sunny, with a high near 46. Calm wind.
Wednesday Night
Mostly cloudy, with a low around 31. Light northwest wind.
Thursday
Partly sunny, with a high near 46.
Thursday Night
Partly cloudy, with a low around 29.
Friday
Partly sunny, with a high near 43.
Friday Night
Mostly cloudy, with a low around 28.
Saturday
Patchy dense fog before 10am. Otherwise, partly sunny, with a high near 42.
Saturday Night
Partly cloudy, with a low around 27.
Sunday
Partly sunny, with a high near 42.
Sunday Night
Partly cloudy, with a low around 27.
M.L.King Day
Partly sunny, with a high near 41.
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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:
3:20 pm PST Jan 12, 2026
Forecast Valid:
5pm PST Jan 12, 2026-6pm PST Jan 19, 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

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Chance of Precipitation