What Record-Shattering Heat Is Doing To US Cities What Record-Shattering Heat Is Doing To US Cities Portland hit a record of 115 degrees Fahrenheit Monday, as locations across the region notched new all-time highs. Children play in a riverfront water fountain during a heatwave in Portland, Oregon. The brutally hot weather that's already pushed U.S. Northwest temperatures to record highs worsened Monday and is set to smother the region all week. Portland hit a record of 115 degrees Fahrenheit (46 Celsius) Monday, as locations across the region notched new all-time highs. Seattle-Tacoma International Airport touched 108 degrees, while in Canada, Lytton in British Columbia set a new national record a day after shattering a previous high that had stood since 1937.