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-Troutdale Airport (KTTD)

Lat: 45.55111°NLon: 122.40889°WElev: 36.0ft.

Partly Cloudy

46°F

8°C

Humidity 93%
Wind Speed ENE 3 MPH
Barometer 29.66 in (1004.4 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 24 Dec 06:00 PM PST
Extended Forecast for

Gresham OR

  • Tonight

    Tonight: A 30 percent chance of rain, mainly after 4am. Increasing clouds, with a low around 39. East northeast wind 6 to 11 mph, with gusts as high as 21 mph.

    Low: 39 °F

    Partly Cloudy
    then Chance
    Rain

  • Christmas Day

    Christmas Day: Rain, mainly after 8am. High near 51. East northeast wind 7 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    High: 51 °F

    Rain then
    Chance Rain

  • Thursday Night

    Thursday Night: A slight chance of rain before 9pm, then rain likely after 10pm. Mostly cloudy, with a low around 39. East wind around 8 mph. Chance of precipitation is 60%.

    Low: 39 °F

    Rain Likely

  • Friday

    Friday: Showers. High near 47. Southeast wind 9 to 11 mph becoming southwest in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 47 °F

    Showers

  • Friday Night

    Friday Night: Showers, mainly before 4am. Snow level 1700 feet. Low around 36. West southwest wind around 11 mph, with gusts as high as 21 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 30 percent chance of showers before 10am. Snow level 1400 feet rising to 1900 feet in the afternoon. Mostly cloudy, with a high near 44.

    High: 44 °F

    Chance
    Showers then
    Mostly Cloudy

  • Saturday Night

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

    Low: 33 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 45.

    High: 45 °F

    Partly Sunny

  • Sunday Night

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

    Low: 33 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A 30 percent chance of rain, mainly after 4am. Increasing clouds, with a low around 39. East northeast wind 6 to 11 mph, with gusts as high as 21 mph.
Christmas Day
Rain, mainly after 8am. High near 51. East northeast wind 7 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Thursday Night
A slight chance of rain before 9pm, then rain likely after 10pm. Mostly cloudy, with a low around 39. East wind around 8 mph. Chance of precipitation is 60%.
Friday
Showers. High near 47. Southeast wind 9 to 11 mph becoming southwest in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
Showers, mainly before 4am. Snow level 1700 feet. Low around 36. West southwest wind around 11 mph, with gusts as high as 21 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
A 30 percent chance of showers before 10am. Snow level 1400 feet rising to 1900 feet in the afternoon. Mostly cloudy, with a high near 44.
Saturday Night
Mostly cloudy, with a low around 33.
Sunday
Partly sunny, with a high near 45.
Sunday Night
Mostly cloudy, with a low around 33.
Monday
Partly sunny, with a high near 47.
Monday Night
Partly cloudy, with a low around 34.
Tuesday
Partly sunny, with a high near 48.
Tuesday Night
Partly cloudy, with a low around 35.
Wednesday
A slight chance of showers. Partly sunny, with a high near 48.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Gresham OR
 45.5°N 122.41°W (Elev. 390 ft)
Last Update:
5:41 pm PST Dec 24, 2025
Forecast Valid:
6pm PST Dec 24, 2025-6pm PST Dec 31, 2025
 
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Additional Resources

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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