Portland is waking up Saturday to classic gray skies and temperatures in the low 50s, but the weekend is about to flip the script. By Sunday, the metro area is expected to jump into the low 90s, with the National Weather Service issuing a Heat Advisory for the Portland and Vancouver metro area from 8 a.m. to 11 p.m. Overnight lows are forecast to hang in the 50s, which will offer only modest relief from the daytime heat.
What To Expect This Sunday
Sunday is set to be the hottest day of this warm stretch, with highs near 91°F across the metro and many inland spots likely to top 90°F. The advisory calls out a Moderate heat risk, especially for people without reliable access to cooling. Forecasters also note that the heat could push some inland locations close to their daily record highs. For full details on timing, forecast trends and official statements, check the National Weather Service.
Afternoon Thunder Risk
On top of the heat, there is a modest shot at isolated thunderstorms Sunday afternoon and evening, mainly along the west slopes of the Cascades and into the northern Willamette Valley. Most forecast guidance keeps any storms scattered and on the weaker side, but any cell that does pop could bring a quick burst of heavy rain, lightning and gusty winds, enough to disrupt outdoor plans. If you are hosting events or working outside, consider shifting the heaviest activity to the morning or building in shade and frequent water breaks.
Safety And Cooling Options
Health officials recommend drinking plenty of fluids, staying in cool or air-conditioned spaces during the hottest part of the day and checking in on older neighbors, young children and pets who are more vulnerable to heat. If you do not have air conditioning, use fans, keep windows closed while temperatures are hottest and open them at night to pull in cooler air. For a list of official cooling centers, libraries and other relief options around the county, see Multnomah County.
Commuting And Events
Morning low clouds and a marine layer should clear out by mid to late afternoon, leaving mostly sunny skies and light north-northwest winds around 3 to 8 mph for inland neighborhoods. Afternoon commutes and outdoor gatherings will feel much hotter than the calendar might suggest, so bring water, sun protection and plan for shade wherever you can. If you are escaping to the coast, you will find cooler air but should still be cautious near the water and avoid the surf zone.
Quick Forecast
Saturday: partly sunny with a high near 79°F. Sunday: hot and sunny with a high near 91°F and a Heat Advisory from 8 a.m. to 11 p.m. Monday: mostly sunny with a high near 80°F. Overnight lows are expected to stay in the 50s through this period, which means limited nighttime cooling.
