Oregon Weather Alert: Rain Returns, Frost Risk Follows in Eugene This Week

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Oregon – Headlights glow through thick fog this morning as damp air clings to the Willamette Valley and visibility drops in pockets. The chill feels sharper than recent days, and slick pavement adds another layer of caution for early commuters and school traffic. Winter Weather is making its presence felt again.

According to the National Weather Service, Eugene starts the day near 33 degrees with dense fog reducing visibility to around half a mile at times. A chance of rain develops later today, with highs struggling to reach the upper 40s. Light winds limit blowing hazards, but fog and moisture remain the main concerns.

Rain becomes more widespread into tonight and Wednesday as a Pacific system moves inland. Showers may be steady at times, with rainfall totals reaching up to a half inch. Roads along I-5, Highway 126, and city arterials could see standing water during heavier bursts.

By Wednesday night, colder air filters in behind the rain. Temperatures dip into the mid-30s, and snow levels lower to around 2,200 feet. While valley snow is unlikely, nearby foothills could see flakes, and bridges may turn slick late.

Thursday brings lingering showers early, then gradual improvement. Highs remain in the mid-40s, keeping a raw Winter feel. As skies partially clear Thursday night, patchy frost becomes possible, especially in sheltered neighborhoods and rural areas.

Looking toward the weekend, conditions turn drier and slightly milder. Highs climb toward 50 by Friday and Saturday, though cold nights persist with frost still a concern. Daylight continues to increase through January, offering brighter evenings despite the chilly start to 2026.

Driving early today or tonight? Let us know how visibility and road conditions look where you are.

Five-Day Outlook for Eugene, Oregon

  • Today: Chance of rain, fog early, high near 47°
  • Wednesday: Rain likely, high near 42°, wet roads
  • Thursday: Rain early, then clearing, high near 46°
  • Friday: Mostly cloudy, high near 50°, patchy frost late
  • Saturday: Frost early, then mostly cloudy, high near 51°