Portland starts the day clear and in the mid 50s, but the warmup is on a fast track, with afternoon highs expected to reach about 87°F. North-northwest winds will ramp up through the day, with gusts near 20 mph in parts of the valley. Evenings should stay on the mild side, with lows mostly in the upper 50s to low 60s, offering at least some nighttime relief. All of this is the lead-in to a hotter Friday and an even more intense heat spike early next week.
Afternoon Gusts and Boating
Under mostly sunny skies, Thursday’s high should land close to 87°F, with north-northwest winds around 3–10 mph and gusts that could reach 20 mph. That is enough to flip patio umbrellas, make biking a bit of a slog, and kick up choppy conditions on the water. Expect the strongest gusts from afternoon into early evening across the Willamette Valley and the Portland metro, while coastal waters stay bumpy with small craft advisories at times. According to National Weather Service Portland, gusts could approach 20 mph and temperatures are set to climb further through Friday and into next week.
Holiday And Weekend Outlook
Friday, which is Juneteenth, is on track to be even hotter, with a forecast high near 90°F and lighter northwest breezes that will make outdoor events feel warmer and a bit more airless. Saturday offers some relief, with highs backing off into the upper 70s, before Sunday bounces back to sunny weather and highs in the mid to upper 80s. Overnight temperatures through the weekend should generally settle in the mid 50s to low 60s, giving most neighborhoods at least a modest cool-down before the workweek heat arrives.
Heat Risk Early Next Week
Forecast models show a stronger ridge of high pressure building from Sunday into early next week, pushing inland highs into the 90s on both Monday and Tuesday. Monday’s forecast high is near 97°F and Tuesday’s near 94°F, with limited overnight cooling for many neighborhoods. That combination raises the risk of heat stress for older adults, infants, people with underlying health conditions, and anyone without reliable access to air conditioning. The City of Portland outlines cooling locations and the Cooling Portland program for eligible residents; see City of Portland for details and contacts.
Takeaway
Try to schedule outdoor chores and exercise for the cooler morning hours, carry water, and tie down or bring in loose outdoor items before the gusty afternoon winds pick up. Check on neighbors and friends who might be more vulnerable to the heat, and if you need help, you can call 311 or locate a cooling space through city resources. Forecasts will be updated if the timing or intensity of next week’s heat shifts.
