Portland, Oregon – Cooler air and steady rain will take hold across Oregon by Thursday, bringing a noticeable shift toward below-normal temperatures that could impact travel and outdoor plans.
According to the National Weather Service and NOAA’s Climate Prediction Center, much of Oregon is in a 40 to 50 percent probability zone for below-normal temperatures from April 16 through April 20. A persistent trough along the West Coast will funnel cooler air into the region while increasing moisture statewide.
In Portland and across Multnomah, Washington, and Clackamas counties, highs are expected to range from 55 to 62°F during the afternoon hours, with overnight lows in the mid-40s. Periods of rain will develop throughout the day, leading to slick roads along I-5 and I-84, especially during commute hours.
Eugene and the central Willamette Valley will see similar conditions with highs in the upper 50s to low 60s and steady light to moderate rain. Farther south, Medford may reach the mid-60s with scattered showers, while eastern Oregon, including Bend, will see highs in the upper 50s with a mix of clouds and passing rain.
The precipitation outlook shows a 40 to 50 percent chance of above-normal rainfall during this period, with higher elevations in the Cascades likely to see late-season snow, particularly overnight.
Residents should prepare for wet roads, reduced visibility, and cooler temperatures. Drivers should allow extra time, especially along major highways and mountain passes.
This cooler, unsettled pattern is expected to continue through April 20, with additional advisories possible as more systems move into the Pacific Northwest early next week.
