The Pacific Northwest is entering its most significant heat event of the summer season, with Heat Advisories stretching from the Columbia River Gorge to the Puget Sound — covering Portland, Seattle, Vancouver WA and dozens of smaller communities that are poorly equipped for the sustained high temperatures forecast through Tuesday and Wednesday.
Portland Metro: 93 to 97°F Through Tuesday Night
The National Weather Service in Portland issued a Heat Advisory from 11 AM Monday through 11 PM PDT Tuesday for the Portland metro in all its zones. Peak temperatures of 93 to 97°F are forecast, with the Eastern Columbia River Gorge — The Dalles, Arlington, White Salmon — reaching up to 100°F with a “Major Heat Risk” designation.
Portland’s particular vulnerability is well-established after the deadly 2021 heat dome: a large portion of the city’s housing stock lacks air conditioning. NWS Portland advises residents to “stay in a cool place during the heat of the day,” keep windows closed during the day and open at night, and avoid adding to indoor heat.
Seattle: Three Days of Heat Through Wednesday
The NWS Seattle office issued a Heat Advisory through 11 PM PDT Wednesday for the greater Seattle metropolitan area — a three-day advisory covering Seattle, Tacoma, Everett, Bremerton, Renton, Redmond, Kirkland and Bellevue. Temperatures in the 80s today climb into the lower 80s to lower 90s Tuesday, with lows in the mid-50s to lower 60s — some overnight relief, but not enough for homes that have absorbed daytime heat. A wider advisory covers rural western Washington through Tuesday.
Why Pacific Northwest Heat Is Especially Dangerous
The Pacific Northwest’s heat risk is structurally different from Phoenix’s. Air conditioning penetration in Seattle and Portland is far lower than in the desert Southwest — and when heat events arrive in June, they arrive before acclimatization has occurred, in a population whose buildings have not been designed for it. Public health research consistently shows heat events in northern climates cause more excess deaths per degree than equivalent events in already-hot regions.
Dial 2-1-1 in Washington or visit 211info.org in Oregon for sheltering information and cooling resources. Outdoor workers should schedule all strenuous activity before 9 AM. Track the latest at weather.gov/pqr and weather.gov/sew.
