A cold hush covers the southern Willamette Valley this morning, the air damp and still as a December chill settles in. Frost glitters faintly on rooftops from Creswell to Coburg, signaling the start of another cold, clear morning in Eugene, Oregon, before rain clouds begin their slow return.
The National Weather Service in Portland reports patchy frost developing Monday morning, especially in sheltered valleys and low-lying fields. Drivers should watch for slick spots on bridges and rural roads as temperatures dip near 33°F before sunrise. By late afternoon, sunshine will briefly break through with highs near 48°F, offering a mild pause before the next front edges closer.
Tuesday brings a 40% chance of light rain, mainly by midday. While totals should stay under a tenth of an inch, timing could make for a damp morning commute across I-5 and Highway 126. Winds will stay calm, but scattered showers could linger through early Wednesday before the pattern dries again midweek.
By Thursday and Friday, skies turn partly sunny with temperatures climbing into the low 50s — comfortable for early holiday errands, outdoor decorating, or quick weekend travel. Still, frost risk continues each night, and with longer nights and clear skies, cold air will pool easily.
Five-Day Outlook (Eugene, OR):
- Monday: Morning frost, partly sunny, high 48°F, low 36°F.
- Tuesday: Cloudy, 40% rain chance, high 50°F, low 37°F.
- Wednesday: Mostly cloudy, high 48°F, low 34°F.
- Thursday: Mostly sunny, high 49°F, low 41°F.
- Friday: Rain likely, high 54°F, low 45°F.
