Summers in western Washington have historically been quite mild, but extreme heat has become much more common in the past couple of decades. In July of 2009, temperatures soared to 103°F in Seattle and some locations around Puget Sound rose to 100°F for the first time in recorded history. A mere decade later, during the heat wave of June 2021, temperatures rose to 108°F in Seattle and 116°F in Portland marking unprecedented summer record temperatures for both cities.
