Pendleton, Oregon – Dangerous heat will grip parts of eastern Oregon and southeastern Washington through 9 p.m. Tuesday, with temperatures pushing up to 105°F in cities like Pendleton, Tri-Cities, and Walla Walla.
According to the National Weather Service in Pendleton, a heat advisory remains in effect for the foothills of the Northern Blue Mountains in Oregon and the Lower Columbia Basin in Washington. Monday afternoon is expected to be the hottest period, with highs near or above 100°F in Pendleton and Walla Walla, and slightly cooler—but still oppressive—temps near Dayton and Connell.
The advisory warns of a moderate to major risk of heat-related illnesses, especially for vulnerable groups and outdoor workers. Residents are urged to limit strenuous activity during peak afternoon hours, wear lightweight clothing, and take frequent breaks in air-conditioned or shaded environments. Pets and children should never be left in vehicles.
Tri-Cities and Prosser may see some relief as breezes increase Tuesday afternoon, but high heat will linger until at least Tuesday night. South winds may gust up to 25 mph.
Hot, sunny conditions are expected to ease slightly by Wednesday, but above-normal temperatures near 90°F will persist.
🌡️ 5-Day Forecast for Pendleton, OR
- Monday: High 100°F, low 63°F – Hot and sunny
- Tuesday: High 97°F, low 62°F – Sunny with breezy conditions
- Wednesday: High 90°F, low 54°F – Mostly sunny
- Thursday: High 85°F, low 51°F – Mostly sunny
- Friday: High 80°F, low 47°F – Sunny and cooler
