The next 5 days will be hot for inland areas, with triple digit temps likely Fri & Sat afternoon for the Portland/Vancouver metro, Cascade foothills & much of the Willamette Valley. Overnight low temperatures will also be running rather warm, offering minimal relief at night.
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Map and infographic from NWS Portland about an extreme heat event. The map shows Oregon and southwest Washington state, with the Willamette Valley and a large portion of southern Oregon highlighted in magenta for an Extreme Heat Warning. Areas to the west and east of the warning zone are highlighted in orange for a Heat Advisory. The key in the upper right indicates a third, brown-colored area for an Extreme Heat Watch in parts of Oregon. The text provides details: The extreme heat is in effect from 11 AM PDT Friday, August 22, to 5 AM PDT Tuesday, August 26, 2025. It also provides preparedness actions, including staying hydrated, taking frequent breaks from the heat, and checking on vulnerable people.