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

Portland-Hillsboro Airport (KHIO)

Lat: 45.54765°NLon: 122.95568°WElev: 194.0ft.

Overcast

45°F

7°C

Humidity 93%
Wind Speed N 0 MPH
Barometer 30.42 in (1030.14 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Last update 12 Jan 06:35 AM PST
Extended Forecast for

3 Miles ENE Hillsboro OR

Air Stagnation Advisory January 12, 06:49am until January 16, 04:00am
Click here for hazard details and duration
Air Stagnation Advisory
  •  
    Air Stagnation Advisory January 12, 06:49am until January 16, 04:00am

    NOW until 4:00am Fri

    Air Stagnation Advisory

  • Today

    High: 54 °F

    Partly Sunny

  • Tonight

    Tonight: Patchy dense fog before 1am, then patchy dense fog after 2am. Otherwise, mostly cloudy, with a low around 39. Calm wind.

    Low: 39 °F

    Mostly Cloudy
    then Patchy
    Dense Fog

  • Tuesday

    Tuesday: Areas of dense fog before noon. Otherwise, partly sunny, with a high near 53. Calm wind.

    High: 53 °F

    Areas Dense
    Fog then
    Partly Sunny

  • Tuesday Night

    Tuesday Night: Patchy dense fog after 9pm. Otherwise, mostly cloudy, with a low around 37. Calm wind.

    Low: 37 °F

    Patchy Dense
    Fog

  • Wednesday

    Wednesday: Patchy dense fog before 11am. Otherwise, partly sunny, with a high near 51. Calm wind.

    High: 51 °F

    Patchy Dense
    Fog then
    Partly Sunny

  • Wednesday Night

    Wednesday Night: Patchy fog. Otherwise, mostly cloudy, with a low around 39.

    Low: 39 °F

    Patchy Fog

  • Thursday

    Thursday: Patchy fog before 10am. Otherwise, mostly cloudy through mid morning, then gradual clearing, with a high near 56.

    High: 56 °F

    Patchy Fog
    then Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 37.

    Low: 37 °F

    Mostly Clear

Detailed Forecast

Today
Partly sunny, with a high near 54. Calm wind.
Tonight
Patchy dense fog before 1am, then patchy dense fog after 2am. Otherwise, mostly cloudy, with a low around 39. Calm wind.
Tuesday
Areas of dense fog before noon. Otherwise, partly sunny, with a high near 53. Calm wind.
Tuesday Night
Patchy dense fog after 9pm. Otherwise, mostly cloudy, with a low around 37. Calm wind.
Wednesday
Patchy dense fog before 11am. Otherwise, partly sunny, with a high near 51. Calm wind.
Wednesday Night
Patchy fog. Otherwise, mostly cloudy, with a low around 39.
Thursday
Patchy fog before 10am. Otherwise, mostly cloudy through mid morning, then gradual clearing, with a high near 56.
Thursday Night
Mostly clear, with a low around 37.
Friday
Sunny, with a high near 56.
Friday Night
Mostly clear, with a low around 36.
Saturday
Sunny, with a high near 54.
Saturday Night
Mostly clear, with a low around 35.
Sunday
Sunny, with a high near 52.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles ENE Hillsboro OR
 45.54°N 122.86°W (Elev. 200 ft)
Last Update:
6:41 am PST Jan 12, 2026
Forecast Valid:
6am PST Jan 12, 2026-6pm PST Jan 18, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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