Pendleton, Ore. – Extreme heat is gripping Oregon and southeast Washington this week, with temperatures pushing into the triple digits and warnings in effect through Wednesday. Afternoon highs between 95 and 105 degrees are expected across the Columbia Basin, Eastern Columbia River Gorge, and nearby valleys, marking what forecasters say may be the longest heat event of the summer.
According to the National Weather Service in Pendleton, Major to Locally Extreme HeatRisk will affect most lower-elevation communities in central and northeast Oregon, as well as south-central and southeast Washington. Areas including the John Day Basin, Grande Ronde Valley, and Wallowa Valley are at risk for locally major impacts, with dangerous conditions likely during the hottest afternoon hours.
Health officials urge residents to drink water frequently, limit outdoor activity between 10 a.m. and 4 p.m., and wear light clothing. Cooling centers are open in cities such as Pendleton, Hermiston, and La Grande, where residents without air conditioning are encouraged to seek relief. Utilities warn of high power demand as air conditioning use spikes.
This long-duration heat is expected to last through Wednesday, with advisories likely extended if conditions persist.
