PENDLETON, Ore. – Frost sparkles across fields and rooftops this morning as eastern Oregon begins another subfreezing start to the week. The air feels crisp and still, with valley thermometers bottoming out in the upper 20s — a clear sign that the region has fully turned the corner into late fall.
According to the National Weather Service in Pendleton, clear skies will dominate through Wednesday, keeping mornings cold but bringing comfortable afternoons. Highs will climb from the upper 40s Monday to the mid-50s by midweek, with plenty of sunshine for outdoor cleanup and harvest tasks. Residents should continue protecting pipes, plants, and pets each evening, as lows remain near or below freezing through at least Wednesday.
By Thursday, a subtle pattern shift brings milder air and light south winds across the high desert. Afternoon highs will rise into the lower 60s, marking the warmest stretch in over a week. Skies will stay mostly clear — ideal for Halloween preparations and travel along U.S. 97 and I-84.
Friday looks seasonably mild and dry for trick-or-treaters, with sunset temperatures near 58 degrees and light breezes through the valleys. Costumes with light layers should be comfortable for families heading out in the early evening hours.
Long-range models hint at a potential pattern change early next week, with rain chances returning and mountain snow levels dropping once again — a reminder that a chilly November is on deck for Oregon’s interior valleys and passes.
Five-Day Forecast for Pendleton, OR:
Mon: 47/26 – Mostly sunny; cold morning start.
Tue: 59/33 – Sunny, light wind; milder afternoon.
Wed: 56/28 – Clear, crisp morning; sunny later.
Thu: 58/32 – Partly sunny; gentle south breeze.
Fri: 62/34 – Mild and clear; pleasant trick-or-treat evening.
