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Portland Heat Wave Sets Records as Warnings Extend Into Tuesday

Poor nighttime cooling plus unhealthy ozone elevate risks for residents without air conditioning.

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Los Angeles County lifeguards stand on guard as people cool off at Castaic Lake on Wednesday, Aug. 20, 2025, in Castaic, Calif. (AP Photo/Damian Dovarganes)
The unofficial temperature hits 108 degrees at dusk at Sky Harbor International Airport in Phoenix, on July 12, 2023.

Overview

  • The National Weather Service’s Extreme Heat Warning for the Portland metro and Willamette Valley remains in effect through 11 p.m. Tuesday, with highs near 98 on Sunday before a gradual cooldown later in the week.
  • Portland International Airport reached a preliminary 102 degrees on Friday, breaking the Aug. 22 record, while Vancouver, Hillsboro and Eugene posted additional records on Saturday.
  • An ozone air quality advisory for the Portland area continues through 8 p.m. Monday, and officials advise limiting outdoor activity during peak heat.
  • Multnomah County and the City of Portland declared a local emergency through noon Monday as counties run cooling centers and TriMet offers free rides to those locations.
  • Oregon’s new protections prohibit utility disconnections during the heat event, and at least one Hood to Coast participant was hospitalized after collapsing in the conditions.