Weather
Umatilla County, OR Weather Oct. 17–21: Nights Near Freezing
Eastern Oregon's Pendleton area is heading into a cooler stretch this weekend, with daytime temperatures expected to fall 18 degrees between Friday and Tuesday while overnight lows return to the 30s.
By Marcus Hale · 2026-10-14T11:34:00.629Z
Eastern Oregon's Pendleton area is heading into a cooler stretch this weekend, with daytime temperatures expected to fall 18 degrees between Friday and Tuesday while overnight lows return to the 30s.
According to the National Weather Service forecast for Pendleton, temperatures will reach approximately 78 degrees Friday before dropping into the lower 70s Saturday and middle 60s Sunday. The cooling continues into early next week, when shower chances return.
The transition follows a warmer finish to the workweek, bringing a noticeable shift toward cooler October conditions in Umatilla County.
Weekend Sunshine Comes With Chilly Nights Saturday begins the five day period with mostly sunny skies and a high near 72 degrees, six degrees below Friday's projected high.
The more noticeable change arrives after sunset, when temperatures are expected to fall near 35 degrees Saturday night.
Sunday will bring sunshine and a high near 64 degrees, continuing the cooling trend. Temperatures are expected to fall to approximately 36 degrees Sunday night under partly cloudy skies.
Those overnight readings will bring chilly conditions to the Pendleton area, particularly during the early morning hours.
Although the National Weather Service identifies patchy frost potential Wednesday night into Thursday morning, the supplied forecast does not explicitly predict frost during the Saturday through Tuesday coverage period.
Residents with temperature sensitive plants may want to monitor updated overnight forecasts as readings approach the middle 30s.
Cooler Weather, Shower Chances Early Next Week By Monday, Pendleton's afternoon temperature is expected to reach approximately 62 degrees under partly sunny skies.
That represents a 16 degree decline from Friday's high.
Monday night introduces a slight chance of showers, with mostly cloudy conditions and temperatures falling near 34 degrees.
Tuesday remains cool, with a high near 60 degrees and another slight chance of showers. Mostly sunny skies are otherwise expected.
The National Weather Service has not specified precipitation totals in the supplied forecast, and no widespread storm threat is indicated for Pendleton during this period.
NOAA's separate national discussion highlights a significant cold air outbreak across portions of the central United States late this week, but does not establish that system as the cause of Pendleton's weekend cooling.
The available forecast supports a pronounced temperature decline in the Pendleton area, although conditions elsewhere across Eastern Oregon may vary.
Five Day Weather Outlook: Oct. 17–21 Temperatures below represent National Weather Service forecasts for Pendleton, Oregon, in Umatilla County. Conditions may differ elsewhere across Eastern Oregon.
Saturday, Oct. 17: Mostly sunny, with a high near 72°. Partly cloudy overnight, with a low near 35°. Sunday, Oct. 18: Sunny and cooler, with a high near 64°. Partly cloudy overnight, with a low near 36°. Monday, Oct. 19: Partly sunny, with a high near 62°. Mostly cloudy overnight, with a slight chance of showers and a low near 34°. Tuesday, Oct. 20: Mostly sunny with a slight chance of showers. High near 60°. Overnight conditions were not provided. Wednesday, Oct. 21: Forecast details were not available in the supplied National Weather Service outlook.