Portland started Sunday feeling more like classic spring, with clear skies and mid‑50s at Portland International Airport. By afternoon, though, it will feel like someone flipped the thermostat to July. A Heat Advisory is in effect across the metro on Sunday, May 3, 2026, with inland highs jumping into the low 90s. Many neighborhoods are expected to top out around 91 to 92°F, with slightly cooler readings nearer the coast. If you have outdoor plans, push them into the morning or evening and do not forget the water bottle.
Sunny, Hot Afternoon; Advisory Details
According to NWS Portland, the Heat Advisory runs from 8 a.m. to 11 p.m. Sunday and calls for daytime highs up to about 91°F in the Portland/Vancouver metro. Forecasters say there is roughly a 5% chance that some urban spots could sneak up toward 95°F, and they warn that the hot daytime temperatures could trigger heat illnesses for people without reliable cooling. Overnight lows are expected to fall back into the mid‑50s, which should bring at least some relief after dark.
Where It’ll Be Hottest
Inland valleys such as the Tualatin Valley, parts of east Portland and neighborhoods near the Columbia River Gorge are the best bets for the hottest readings, while coastal communities stay much cooler. This warm‑up has been on the radar for a few days; see how it set up in our earlier look at how the weekend heat bears down on the city and coast. If you live in a low‑shade area or on an upper floor, plan ahead for the peak afternoon hours.
Isolated Afternoon Storms Over The Cascades
Most of the metro should stay dry, but forecasters see a 15 to 30% chance of isolated showers or thunderstorms over the Cascades and nearby foothills this afternoon and early evening, mainly south of OR‑22. Any storms that pop are expected to be brief and more likely to produce localized heavy downpours than organized severe weather, according to NWS Portland. Hikers and campers in the Cascades should keep an eye on radar and throw a light rain layer into the pack.
Cooling Options And Safety Tips
Multnomah County maintains an updated list of cooling centers and "cool spaces" for residents who need relief during heat events; check the county website for the latest locations and hours. During the advisory, stick with the basics: drink plenty of water, avoid strenuous activity in the hottest part of the day, check on older adults and young children, and keep pets out of direct sun. If you work outside, schedule frequent breaks in shade or air‑conditioned areas and stay on top of hydration.
We will track the advisory through Sunday night and update if conditions change.
