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

Prolonged Atmospheric River in the Pacific Northwest; Snow and High Winds in the North-Central U.S.

A prolonged atmospheric river will continue impacting the Pacific Northwest with heavy rainfall which has lead to areas of urban and river flooding along with gusty winds into Thursday. A clipper will bring heavy snow, some mixed wintry precipitation, and gusty to high winds across the northern Plains, Upper Midwest, and the Great Lakes into Thursday morning. Read More >

Hazardous Weather Conditions

Current conditions at

Portland-Hillsboro Airport (KHIO)

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

light rain,mist

46°F

8°C

Humidity 93%
Wind Speed N 3 MPH
Barometer 30.18 in (1022.01 mb)
Dewpoint 45°F (7°C)
Visibility 3.00 mi
Last update 09 Dec 10:00 AM PST
Extended Forecast for

Hillsboro OR

Flood Watch December 9, 10:15am until December 11, 04:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch December 9, 10:15am until December 11, 04:00pm

    NOW until 4:00pm Thu

    Flood Watch

  • Today

    High: 57 °F

    Rain

  • Tonight

    Tonight: Rain. Low around 50. South southwest wind 11 to 14 mph, with gusts as high as 26 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 50 °F

    Rain

  • Wednesday

    Wednesday: Rain. High near 59. South southwest wind around 11 mph, with gusts as high as 22 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 59 °F

    Rain

  • Wednesday Night

    Wednesday Night: Rain. Low around 54. South southwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 54 °F

    Rain

  • Thursday

    Thursday: Rain, mainly before 4pm. High near 59. South southwest wind around 6 mph. Chance of precipitation is 80%.

    High: 59 °F

    Rain

  • Thursday Night

    Thursday Night: A 30 percent chance of rain before 10pm. Mostly cloudy, with a low around 49.

    Low: 49 °F

    Chance Rain
    then Mostly
    Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 59.

    High: 59 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 46.

    Low: 46 °F

    Mostly Cloudy

Detailed Forecast

Today
Rain. High near 57. Light and variable wind becoming south southeast around 6 mph in the afternoon. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Tonight
Rain. Low around 50. South southwest wind 11 to 14 mph, with gusts as high as 26 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday
Rain. High near 59. South southwest wind around 11 mph, with gusts as high as 22 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
Rain. Low around 54. South southwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday
Rain, mainly before 4pm. High near 59. South southwest wind around 6 mph. Chance of precipitation is 80%.
Thursday Night
A 30 percent chance of rain before 10pm. Mostly cloudy, with a low around 49.
Friday
Mostly cloudy, with a high near 59.
Friday Night
Mostly cloudy, with a low around 46.
Saturday
A chance of rain, mainly after 4pm. Mostly cloudy, with a high near 55.
Saturday Night
Rain likely, mainly after 10pm. Mostly cloudy, with a low around 46.
Sunday
A chance of rain. Mostly cloudy, with a high near 54.
Sunday Night
Rain likely. Mostly cloudy, with a low around 47.
Monday
Rain. Cloudy, with a high near 56.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Hillsboro OR
 45.53°N 122.95°W (Elev. 200 ft)
Last Update:
9:45 am PST Dec 9, 2025
Forecast Valid:
10am PST Dec 9, 2025-6pm PST Dec 15, 2025
 
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