When will the Boise, ID heat wave end? 100 degree days continue
While Boise missed the blistering temperatures that have set in over much of the Pacific Northwest this week, the unusually warm weather that has plagued Treasure Valley in recent days isn’t going away anytime soon.
Temperatures in the Treasure Valley are expected to reach 100 degrees every day until July 8, according to the National Weather Service.
If the forecast comes true, it will break the record for the longest streak of over 100 degree days, according to Korri Anderson, a meteorologist at the Boise Weather Service office.
The current record is nine days, set from June 26 to July 4, 2015, Anderson said.
Already, temperatures in Boise have reached 100 degrees per day since Monday for a total of four days. If the forecast holds through July 8, the new record would be 11 days. Meridian, Nampa and Eagle are also expected to experience more than 100 degree days through Thursday of next week.
An excessive heat warning is in place in the area until Saturday evening, which the weather service could extend further.
And although the weather service does not forecast temperatures beyond seven days due to unreliability, it says the hot weather is unlikely to end at that time.
“Until July 15, it looks quite favorable for above-average temperatures to continue,” meteorologist Katy Branham told the Idaho Statesman by phone.
She added that while Boise has experienced days that are warmer than last week, a period of consistently high temperatures for such a long time is unusual.
“Having so many in a row is important,” she said.
Scientists studying Earth’s climate have found that extreme heat waves have increased in duration and intensity since at least the 1950s, with excess heat causing the likelihood of death to increase in some areas. In 2019, The Associated Press found that daily hot weather records were twice as frequent as daily cold weather records over the past 20 years.
Mojtaba Sadegh, assistant professor of civil engineering at Boise State University, told the Statesman that he believes the current period of extreme heat is “no doubt” related to climate change, which is largely caused by human emissions of greenhouse gases into the atmosphere.
He said climate change has increased both the duration of individual heat waves as well as the season in which heat waves occur across the world.
“Heat waves can occur with or without climate change, but the intensity that we are seeing is certainly, without a doubt, attributed to climate change,” he said.