(AccuWeather) – The Pacific Northwest is bracing for what is expected to be a historic and “life-threatening” heatwave, the likes of which — in terms of high temperatures and duration — has never been experienced before in that part of the country.

AccuWeather forecasters are calling for record-shattering heat to envelop the region through the weekend and linger into next week, not only making life miserable for a part of the country where air conditioning is not prevalent but also posing a significant health risk to millions.

High temperatures well into the triple digits are forecast throughout parts of Oregon and Washington, which includes the Interstate 5 corridor. Both Portland, Oregon, which could see the mercury crack the 110-degree-Fahrenheit mark, and Seattle, which is expected to top 100, will see temperatures soar 30 to 40 degrees above normal. Points farther inland are likely to have temperatures balloon to above 115.


Average highs in June can be anywhere from the 70s in eastern Washington and Oregon to the 80s in western areas into Idaho. Following a cooler stretch of weather, the dangerous heat is forecast to peak from Saturday through Monday as high pressure settles in and enables temperatures to climb to new heights.

“There are typically a few rounds of heat in the Pacific Northwest each summer, but this particular heatwave looks quite extreme,” said AccuWeather Meteorologist Brian Thompson, who regularly analyzes weather patterns in the West. READ MORE

AccuWeather Inc. is an American media company that provides commercial weather forecasting services worldwide. AccuWeather was founded in 1962 by Joel N. Myers, then a Pennsylvania State University graduate student working on a master’s degree in meteorology.