Those who had been enjoying the cloudy cool summer experienced earlier in July will want to bottle up the next few days as marine clouds and cooler air make their way into the Portland area.
The National Weather Service has been watching clouds bank up against the Oregon coast early Thursday morning and expect those clouds to push eastward through the Coast Range gaps and into the valleys. The cooler marine air will help area high temperatures drop 5-10 degrees from Wednesday’s high of 91 to about 86. Skies will start out partly cloudy then clear to mostly sunny by the afternoon.
Friday should be even cooler. A west to northwesterly air flow will continue to bring in cool air from the coast. While Portland and much of the Willamette Valley will see mostly cloudy skies through the morning, and a high of only about 80 degrees, the coast will likely get some drizzle out of this system, at least through the morning hours.
Cloud cover should be less thick early Saturday, especially in the southern parts of the Willamette Valley. Portland could see some clouds early in the day, then clearing to mostly sunny skies. High temperatures will likely reach about 82 degrees.
Sunday will get a bit of a temperature bump under sunny skies, with highs likely to reach about 89.
Forecast models are still suggesting that next week could bring a longer stretch of hot weather. Current probabilities are showing a 40-50% chance of temperatures above 95 Monday through Friday next week. It will be the area’s first extended heat event and could cause issues for those who are greatly affected by the heat. Now’s a good time to plan for extended hot days ahead.