Portland Area Faces 4-Day 90-Degree Heat Wave as High Pressure Builds
Updated
Updated · KATU · Jul 17
Portland Area Faces 4-Day 90-Degree Heat Wave as High Pressure Builds
3 articles · Updated · KATU · Jul 17
Summary
Monday starts an extended stretch of above-average heat in the Portland area, with highs expected to top 90 degrees for at least four days.
A strengthening high-pressure system moves into the region Saturday and intensifies into early next week, with forecast models now aligning on hot, sunny conditions.
Tuesday is shaping up as the hottest day, with west-of-Cascades temperatures reaching the mid-90s while some areas east of the Cascades approach 100 degrees.
In the Willamette Valley, meteorologists define a heat wave as three or more days above 90 degrees, putting the coming stretch firmly in that category.