Heat advisory in effect as temperatures expected to soar in northwest Oregon and Southwest Washington

People across Oregon’s Willamette Valley and Southwest Washington are likely to see temperatures in the 90s early this week.

The National Weather Service has issued a heat advisory from 11 a.m. Monday through 11 p.m. Tuesday for much of northwest Oregon and Southwest Washington.

High temperatures could reach the mid-90s in the Portland-Vancouver metro area, the Willamette Valley, the Columbia River Gorge and the Hood River Valley on Monday and Tuesday.

Officials urge people to stay hydrated, limit strenuous outdoor activity during the hottest parts of the day and take frequent breaks if working outside.

Anyone seeking relief in rivers or streams should use caution, as waterways may be fast-moving and dangerously cold, despite the hot weather. Heat-related illnesses, and even deaths, increase significantly during extreme heat events.

Temperatures are expected to begin easing Wednesday, with highs likely falling into the upper 80s and low 90s.

Much cooler temperatures are expected by Thursday. Rain is expected to return to western Oregon and the Cascades Thursday night, and temperatures will struggle to rise much above 70 through the weekend.