Oregon – Frost clings to parked cars and quiet sidewalks across the metro this morning, turning the final Monday of 2025 into a sharp, cold start. The air feels still and crisp, and the chill sets the tone for a week that begins dry but ends wetter as New Year’s travel ramps up.
According to the National Weather Service, temperatures dipped into the mid-30s across Portland early Monday, cold enough for areas of frost before sunrise. Calm to light winds allowed cold air to settle, increasing slick-spot potential on bridges, overpasses, and shaded streets during the morning commute.
Highs rebound into the mid-40s today as clouds thin and sunshine breaks through. Conditions remain dry through Tuesday, though cold nights persist. Patchy frost remains possible again early Tuesday and Wednesday mornings, especially outside the urban core. Drivers crossing the Fremont Bridge, Marquam Bridge, and nearby stretches of I-5 and I-84 should stay alert during early hours.
By Wednesday, frost fades later in the morning, and clouds gradually increase. Attention then turns to New Year’s Eve plans. A weak system approaches late Wednesday night, bringing a slight chance of rain after dark. While impacts remain limited, damp pavement could slow late-night travel.
Rain becomes more likely on New Year’s Day Thursday as 2026 begins. Periods of rain may develop by morning and continue through the day, creating wet roads for return trips and holiday outings. Temperatures remain above freezing, limiting winter precipitation concerns but keeping traction issues in play.
Across the nation, Arctic air and major winter storms dominate headlines. In Portland, winter arrives more quietly. Frosty mornings give way to gray skies and rain, a familiar Northwest transition as the calendar flips.
More updates may follow as rain chances increase. Heading out early today or traveling for New Year’s? Tell us how cold it feels where you are.
Five Day Outlook for Portland, Oregon
Monday: Areas of frost early, then partly sunny, high near 46
Monday Night: Partly cloudy, low near 36
Tuesday: Frost early, then sunny, high near 48
Wednesday: Frost early, then partly sunny, high near 48
Thursday: Rain likely, high near 45
