Just in the southern half of the PNW, if any one of the Oregon Coast, Hood-Gorge, Central Oregon, Wallowas, Mt Shasta country, etc were put anywhere else in the world but the western US, they’d be massive tourist destinations. Here, they’re just another place.
Alternatively, the warmest ambient anomalies could be centered in mid-late July as you said, but the warmest individual days could pop up in August/early September as the undercutting STJ amplifies transient ridging. Would make for some nifty thermals though. Seattle is overdue for an epic thunderstorm outbreak... We have to go back to September 2019 for the last really good upscale event, and May 2017 for one that involved a more classic undercutting trough/negative tilting type situation