Oregon starts the morning with headlights glowing through thin fog and frost clinging to windshields across the southern Willamette Valley. The air feels sharp, and cold pavement reminds drivers that winter conditions are settling in as end-of-year travel ramps up.
According to the National Weather Service in Portland, temperatures across Eugene dip near freezing during the early morning hours, with lows around 31 degrees expected through Sunday night. Patchy fog forms before sunrise, especially in low-lying areas and near open fields, briefly reducing visibility on local roads and rural stretches of Highway 99 and I-5.
Today stays mostly dry, with a slight chance of early showers fading quickly. Afternoon highs reach the mid-40s, helping frost melt, though shaded roads may remain slick longer than expected. Widespread frost develops again tonight, continuing a pattern of cold starts through early next week.
Sunday brings a similar setup. Fog lingers early, followed by filtered sunshine and highs in the low 40s. Calm winds allow cold air to settle overnight, increasing the risk of black ice where moisture remains on bridges, overpasses, and untreated roads.
For now, this stretch offers relatively smooth travel conditions for holiday returns. To be fair, drivers should stay cautious during early departures, when frost and fog combine to create sudden hazards.
Looking ahead, conditions stay mostly dry into Tuesday, with gradual warming during the day but continued chilly nights. Rain chances increase by Wednesday and into New Year’s Day, which could bring slick roads back into play as traffic increases.
Plan extra time for morning travel, slow down in fog, and watch for icy patches before sunrise.
Five-Day Weather Outlook for Eugene, OR
Today: Mostly cloudy early, slight shower chance, high near 46.
Sunday: Frost and fog early, then partly sunny, high near 43.
Monday: Frost early, mostly sunny, high near 46.
Tuesday: Frost early, mostly sunny, high near 47.
Wednesday: Increasing clouds, chance of rain, high near 50.
