Portland, OR – After a brief stretch of calm weather, rain is set to return to Northwest Oregon beginning Friday night, as a Pacific storm system approaches the coast. According to the National Weather Service (NWS) in Portland, residents can expect widespread rainfall, gusty winds, and cooler temperatures through the weekend.
The Weather Pattern: Pacific Front Targets Oregon
A developing low-pressure system over the Pacific Ocean is forecast to bring a 70% chance of rain by late Friday, rising to near 100% overnight into Saturday. This system marks a transition to a more active November pattern, with clouds steadily increasing throughout the day.
High temperatures on Friday are expected to reach around 59°F, with south winds picking up by evening. By Saturday morning, a steady band of rain will sweep through the Willamette Valley, tapering off to showers by midday.
“This will be the first widespread rainfall we’ve seen in several days,” said the NWS in its latest forecast discussion. “Most areas will pick up between a quarter and a half inch of rain before conditions begin to dry out Saturday afternoon.”
Impacts for Commuters and Travelers
The heaviest rainfall is expected during the early morning hours on Saturday, which could make for slippery roads and slower traffic on major routes, including I-5 and I-84. Drivers are advised to allow extra travel time and reduce speed when navigating wet or ponded roadways.
For those traveling east toward the mountains, forecasters say the storm’s cooler air will drop snow levels by the weekend. While no significant accumulation is expected immediately, the Cascade passes—including Government Camp and Santiam Pass—could see their first flakes of the season as early as next week.
Forecast Outlook: Cooler Days Ahead
Following Saturday’s rain, temperatures will cool as high pressure briefly rebuilds over the region. Highs on Sunday are expected to reach the mid-50s, with partly cloudy skies and lighter winds offering a short-lived break before the next round of unsettled weather.
Meteorologists say the long-range pattern between November 8–15 suggests a colder and more active stretch, possibly bringing stronger storms and snow to the Cascades.
“We’re entering that time of year when systems line up one after another,” said an NWS meteorologist. “Expect an increasing frequency of rain events and cooler air behind each front.”
What Residents Should Prepare For
- Rain begins Friday night, becoming heavy at times early Saturday.
- 0.25 to 0.50 inches of rainfall expected across the Portland metro area.
- Morning commute delays possible Saturday due to wet conditions.
- Cooler temperatures returning Sunday and early next week.
- Possible Cascade snow next week as colder air arrives.
Umbrellas and rain gear will once again be staples for the weekend, marking the official return of Oregon’s fall weather rhythm.
Conclusion
As clouds gather over the Willamette Valley, residents should prepare for a wet and breezy weekend ahead. While the rainfall may cause minor inconveniences, it also marks the welcome return of the Pacific Northwest’s signature season — gray skies, cool air, and coffee-fueled mornings.
How are you preparing for the return of Oregon’s rainy season? Share your thoughts and weekend weather tips in the comments below.
