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

Atmospheric River Bringing Heavy Rain to Southern California and Heavy Snow to the Sierra Nevadas

A strong atmospheric river will continue heavy rain over southern California through Friday. The heaviest rainfall is ongoing today in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall has begun over the Sierra Nevada Mountains and will continue through Friday. Travel will become increasingly difficult over the passes due to snow and strong winds. Read More >

Current conditions at

Portland, Portland International Airport (KPDX)

Lat: 45.59578°NLon: 122.60917°WElev: 20.0ft.

Mostly Cloudy

41°F

5°C

Humidity 95%
Wind Speed N 0 MPH
Barometer 29.65 in (1004.06 mb)
Dewpoint 40°F (4°C)
Visibility 10.00 mi
Last update 26 Dec 12:53 AM PST
Extended Forecast for

2 Miles E Lake Oswego OR

  • Overnight

    Overnight: A chance of rain between 2am and 4am, then showers after 4am. Steady temperature around 42. Calm wind. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 42 °F

    Showers

  • Friday

    Friday: Showers, mainly before 3pm. High near 46. South southwest wind 6 to 9 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 46 °F

    Showers
    Likely then
    Showers

  • Friday Night

    Friday Night: Showers, mainly before 2am. Snow level 1600 feet. Low around 36. Southwest wind around 8 mph, with gusts as high as 18 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 36 °F

    Showers

  • Saturday

    Saturday: A 40 percent chance of showers, mainly before 10am. Snow level 1400 feet. Partly sunny, with a high near 45. Southwest wind around 6 mph.

    High: 45 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 35. Calm wind.

    Low: 35 °F

    Mostly Cloudy

  • Sunday

    Sunday: Patchy fog before 7am. Patchy frost before 10am. Otherwise, partly sunny, with a high near 45.

    High: 45 °F

    Patchy Frost
    and Patchy
    Fog then
    Partly Sunny

  • Sunday Night

    Sunday Night: Areas of frost after 1am. Otherwise, mostly cloudy, with a low around 33.

    Low: 33 °F

    Mostly Cloudy
    then Areas
    Frost

  • Monday

    Monday: Widespread frost, mainly before 8am. Otherwise, partly sunny, with a high near 45.

    High: 45 °F

    Frost then
    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 33.

    Low: 33 °F

    Mostly Cloudy

Detailed Forecast

Overnight
A chance of rain between 2am and 4am, then showers after 4am. Steady temperature around 42. Calm wind. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Friday
Showers, mainly before 3pm. High near 46. South southwest wind 6 to 9 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
Showers, mainly before 2am. Snow level 1600 feet. Low around 36. Southwest wind around 8 mph, with gusts as high as 18 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
A 40 percent chance of showers, mainly before 10am. Snow level 1400 feet. Partly sunny, with a high near 45. Southwest wind around 6 mph.
Saturday Night
Mostly cloudy, with a low around 35. Calm wind.
Sunday
Patchy fog before 7am. Patchy frost before 10am. Otherwise, partly sunny, with a high near 45.
Sunday Night
Areas of frost after 1am. Otherwise, mostly cloudy, with a low around 33.
Monday
Widespread frost, mainly before 8am. Otherwise, partly sunny, with a high near 45.
Monday Night
Mostly cloudy, with a low around 33.
Tuesday
Mostly cloudy, with a high near 46.
Tuesday Night
Mostly cloudy, with a low around 34.
Wednesday
A slight chance of rain. Mostly cloudy, with a high near 46.
Wednesday Night
A chance of rain. Mostly cloudy, with a low around 39.
New Year's Day
Rain likely. Cloudy, with a high near 48.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles E Lake Oswego OR
 45.42°N 122.67°W (Elev. 200 ft)
Last Update:
12:55 am PST Dec 26, 2025
Forecast Valid:
1am PST Dec 26, 2025-6pm PST Jan 1, 2026
 
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Additional Resources

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Chance of Precipitation