Weekend heat wave: 90 degree temperatures expected in Seattle, potential for wildfire smoke Sign In FacebookTwitterEmail 1of8 June 28, 2021 was Seattle's hottest day on record. The National Weather Service (NWS) station at Sea-Tac reached 107 degrees. CLAIRE MAULDING, SPECIAL TO THE SEATTLEPIShow MoreShow Less 2of8 June 28, 2021 was Seattle's hottest day on record. The National Weather Service (NWS) station at Sea-Tac reached 107 degrees. CLAIRE MAULDING, SPECIAL TO THE SEATTLEPIShow MoreShow Less 3of8 4of8 June 28, 2021 was Seattle's hottest day on record. The National Weather Service (NWS) station at Sea-Tac reached 107 degrees. CLAIRE MAULDING, SPECIAL TO THE SEATTLEPIShow MoreShow Less 5of8 June 28, 2021 was Seattle's hottest day on record. The National Weather Service (NWS) station at Sea-Tac reached 107 degrees. CLAIRE MAULDING, SPECIAL TO THE SEATTLEPIShow MoreShow Less