We don't have long, hot summers in the PNW, but we have an occasional hot spell each year. This year it's come over the past weekend. We're in the 80s today, which is warm, but tolerable for the most part.
To deal with the heat, we brought one of our portable AC units when we moved up from Texas. Last night, it ran almost all night, but that was worth it to me, because it meant the pup could keep reasonably comfortable. Sweet old girl, she just can't handle hot like she used to.