Usually all time records are broken by a degree or two. This heat wave was so unprecedented that climate change had to have played a part. You just don't break 3 days in a row with all time record highs by many degrees. Portland below
Monday’s record-setting temperature of 116 broke Sunday’s record-setting high of 112 degrees. Sunday’s high had broken the 108 degree-record set Saturday, which broke the previous high of 107, first set in 1965.