The National Weather Service office in San Diego said Monday the scorching heat wave will continue through Friday evening for all areas except the mountains and deserts.
“Strong high pressure to the north will continue the heat wave through the end of the work week,” the weather service said.
The excessive heat warning that has been in effect since last week was extended through Friday for the coast and inland valleys, and through Thursday for the mountains and deserts.
Highs temperatures each day during the heat wave are expected to be 85 to 95 along the coast, 96 to 106 in the inland valleys, 91 to 102 in the mountains and 108 to 116 in the deserts.
A Flex Alert to conserve power is in effect again on Tuesday, with the California Independent System Operator urging residents to take all possible measures to conserve electricity during the peak hours of 4 p.m. to 9 p.m. for the seventh consecutive day.
Officials warned that rotating blackouts are possible without conservation.
“This is an extraordinary heat event we are experiencing, and the efforts by consumers to lean in and reduce their energy use after 4 p.m. are absolutely essential,” said Elliot Mainzer, the California ISO’s president and CEO.
Despite extending the excessive heat warning, the weather service promised that cooler weather would arrive by the weekend, in part because of the impact of Hurricane Kay off Baja California.
“Beyond the heat that may occur for the coast and valleys on Friday, the increasing moisture will finally put an end to this long heat wave over the weekend with high temperatures not nearly as hot,” the agency said.
Updated at 7:25 a.m. September 5, 2022