The National Weather Service says last month was the hottest August on record for Portland and Salem.
Even the coast experienced warmer-than-normal temperatures. Astoria experienced its third hottest August on record.
And summer isn't over yet. Hot temperatures are expected to spill into September as well; meteorologists say it's hard to predict when the heat will let up.
"It's just a big warm air mass over the area with not a lot of change in the weather pattern," said Treena Jensen, a senior meteorologist with the National Weather Service.