PORTLAND, OR — Low clouds and the steady hush of drizzle mark the start of December’s first true Pacific pattern in Portland. Temperatures hover near 36°F this morning, and the air feels thick with fog and moisture. A few patches of frost still cling to roofs and windshields before another round of showers moves in late today, continuing into Tuesday.
According to the National Weather Service in Portland, a broad coastal system will bring 60% chances of rain by early Tuesday, with highs reaching the upper 40s. The combination of patchy fog and wet pavement could create slower morning travel, especially on I-5, Highway 26, and I-205. Visibility will improve by midday as steadier showers take over.
While no major flooding or snow threats are expected in the metro area, freezing levels will rise above 3,000 feet, allowing only rain for lower elevations. However, slick bridges and shaded roads could briefly freeze early Tuesday where surface temperatures dip close to freezing.
Conditions stay mostly cloudy and damp through midweek, with light fog returning by night. By Thursday and Friday, expect periods of steady rain as another Pacific front pushes inland, bringing typical early-December gray skies and mild 50-degree afternoons.
5-Day Outlook (Portland, OR):
- Monday: Frost early, slight chance of rain, high 47°F.
- Tuesday: Showers likely, high 49°F.
- Wednesday: Fog early, mostly cloudy, high 48°F.
- Thursday: Rain chances increase, high 47°F.
- Friday: Rain likely, high 54°F.
