At 1:16 p.m. on Friday, the National Weather Service issued a heat advisory valid for Sunday between 11 a.m. and 10 p.m. for Tualatin Valley, Inner Portland Metro, East Portland Metro, West Central Willamette Valley, East Central Willamette Valley, West Columbia River Gorge I-84 Corridor, Upper Hood River Valley and Central Columbia River Gorge I-84 Corridor.

"Temperatures between 93 and 97 degrees expected," explains the weather service. "There is a 50-75% chance that Tuesday night low temperatures remain above 65 degrees and a 15-25% chance low temperatures remain above 70 degrees, which would limit overnight relief. The highest chances are in the Portland/Vancouver Metro Area and Columbia River Gorge. There is also 20-40% chance for high temperatures of 100 degrees or hotter across the Willamette Valley on Tuesday and Wednesday."

News Source : https://www.oregonlive.com/weather-alerts/2025/07/heat-advisory-affecting-oregon-sunday.html