SEATTLE (AP) - The hottest day of an unprecedented and dangerous heat wave scorched the Pacific Northwest on Monday, with temperatures obliterating records that had been set just the day before.

Seattle hit 108 degrees Fahrenheit by evening - well above Sunday’s all-time high of 104 F. Portland, Oregon, reached 116 F after hitting records of 108 F on Saturday and 112 F Sunday.

The temperatures were unheard of in a region better known for rain, and where June has historically been referred to as “Juneuary” for its cool drizzle. Seattle’s average high temperature in June is around 70 F, and fewer than half of the city’s residents have air conditioning, according to U.S. Census data.

The heat forced schools and businesses to close to protect workers and guests, including some places like outdoor pools and ice cream shops where people seek relief from the heat. COVID-19 testing sites and mobile vaccination units were out of service as well.

The Seattle Parks Department closed one indoor community pool after the air inside became too hot - leaving Stanlie James, who relocated from Arizona three weeks ago, to search for somewhere else to cool off. She doesn’t have AC at her condo, she said.

“Part of the reason I moved here was not only to be near my daughter, but also to come in the summer to have relief from Arizona heat,” James said. “And I seem to have brought it with me. So I’m not real thrilled.”

The heat wave was caused by what meteorologists described as a dome of high pressure over the Northwest and worsened by human-caused climate change, which is making such extreme weather events more likely and more intense.

Zeke Hausfather, a scientist at the climate-data nonprofit Berkeley Earth, said Monday that the Pacific Northwest has warmed by about 3 degrees F in the past half-century. That means a heat wave now is about 3 degrees warmer than it would have been before - and the difference between 111 degrees and 114 is significant, especially for vulnerable populations, he noted.

“In a world without climate change, this still would have been a really extreme heat wave,” Hausfather said. “This is worse than the same event would have been 50 years ago, and notably so.”

The blistering heat exposed a region with infrastructure not designed for it, hinting at the greater costs of climate change to come. Blackouts were reported throughout the region as people trying to keep cool with fans and air conditioners strained the power grid.

“We are not meant for this,” Washington Gov. Jay Inslee said of the Pacific Northwest in an interview Monday on MSNBC. “This is the beginning of a permanent emergency … we have to tackle the source of this problem, which is climate change.”