Los Angeles Mayor Eric Garcetti, left, comes to the aid of an unidentified man who collapsed in downtown Los Angeles Thursday, Aug. 31, 2017. The temperature in downtown Los Angeles shot past 90 degrees... (Associated Press) 
 
 SAN FRANCISCO (AP) — The heat has peaked for Southern California, but parts of Northern California were set to see it soar some more. 
 
 Temperatures that reached 108 in Sacramento on Friday are expected to shoot past 110 on Saturday as a sweltering week continued. Areas inland from the San Francisco Bay Area could reach 115, a temperature last seen in 1950, forecasters said. 
 
 San Francisco itself saw one of the hottest days in its history Friday at 106 but is now expected to recede into its usual cool-and-foggy summer pattern with dramatic temperature drops into the 80s then the 70s. 
 
 Triple-digit days in the Los Angeles area are expected to drop into the 90s for the weekend, before dropping more dramatically next week. 
 
 The extreme heat sent Michelle Ogburn to a cooling center set up in Santa Clara's North Branch Library, one of many that were opened throughout the state. 
 
 Ice water stations were set up and dozens of people, many of them homeless, were taking shelter Friday. 
 
 "I work from home and I live in an old mobile home with no air conditioning and not very good insulation," said Ogburn, who lives in Sunnyvale. "Today it was very hot and I just couldn't work." 
 
 Managers of California's power grid asked for voluntary electricity conservation. Tens of thousands of people across the state were without power at various times Friday, though most outages didn't last long. 
 
 The weeklong heat wave has been generated by high pressure over the West, the National Weather Service said. 
 
 Forecasters said more heat could be expected when remnants of Tropical Storm Lidia move north from Mexico's Baja California during the weekend. 
 
 The warmth extended up the West Coast and into mountain states, with excessive-heat warnings posted for southwest Oregon and lesser advisory-level conditions in northwest Oregon. Western Washington state expected a sunny, hot and dry Labor Day weekend. 
 
 Fire weather warnings were in effect for parts of Montana, Wyoming and South Dakota. ||||| Tweet with a location 
 
 You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more ||||| Los Angeles Mayor Eric Garcetti, left, comes to the aid of an unidentified man who collapsed in downtown Los Angeles Thursday, Aug. 31, 2017. The temperature in downtown Los Angeles shot past 90 degrees... (Associated Press) 
 
 Los Angeles Mayor Eric Garcetti, left, comes to the aid of an unidentified man who collapsed in downtown Los Angeles Thursday, Aug. 31, 2017. The temperature in downtown Los Angeles shot past 90 degrees... (Associated Press) 
 
 LOS ANGELES (AP) — The Latest on a statewide heatwave in California (all times local): 
 
 4:20 p.m. 
 
 The National Weather Service says San Francisco's temperature has reached 106 degrees Fahrenheit (41 degrees Celsius), breaking an all-time record high. 
 
 The weather service said Friday on Twitter the mercury hit "an incredible 106 degrees!" shortly before 4 p.m. 
 
 The previous all-time record high in downtown San Francisco was 103 degrees Fahrenheit (39 degrees Celsius) set on June 14, 2000. 
 
 The city's previous record for this day of 90 degrees Fahrenheit (32 degrees Celsius) was set in 1950. 
 
 An excessive heat advisory was in effect through Monday night for interior valley and higher elevations in the San Francisco Bay Area. 
 
 ___ 
 
 10:15 a.m. 
 
 Dozens of cooling centers are opening throughout California and schools plan to let students out early as temperatures soar from a heat wave expected to last through the Labor Day weekend. 
 
 Forecasters say some cities in the San Francisco Bay Area are expected to see triple-digit temperatures. Livermore is expected to reach 115 degrees, a temperature last seen in 1950. 
 
 The extreme heat and light wind combined with vehicle exhaust are prompting officials to ask Bay Area motorists to limit their driving to reduce pollution. Officials say smoke from at least a dozen wildfires burning in Northern California is drifting into Bay Area skies and contributing to the unhealthy air. 
 
 The National Weather Service says an excessive heat advisory remains in effect through Monday night for interior valley and higher elevations in the Bay Area. 
 
 ___ 
 
 6:48 a.m. 
 
 Managers of California's power grid are asking for voluntary conservation of electricity as forecasters predict more extreme heat statewide. 
 
 The California Independent System Operator predicts demand on the system will set a new all-time record Friday. 
 
 Consumers are asked to particularly cut back on use of electricity between 1 p.m. and 10 p.m., when use of air conditioners is at its peak. 
 
 The National Weather Service warns that the heat will bring a high risk of heat-related illness, especially for the elderly, the infirm and children. 
 
 Forecasters also say the heat will be dangerous to anyone without proper hydration or adequate cooling. ||||| Photo: Santiago Mejia, The Chronicle Image 1 of / 28 Caption Close 
 
 Image 1 of 28 Buy photo GALLERY: San Francisco is hotter than these cities right now 
 
 From left: Amilia Madigan, age 11, and her mother Desy Stoyanov cool off from the heat using the water sprinklers at Golden Gate Park on Friday, Sept. 1, 2017, in San Francisco, Calif. The National Weather Service issued an excessive heat warning as the San Francisco Bay Area reached temperatures in the upper 90s and some areas surpassed 100 degrees. less GALLERY: San Francisco is hotter than these cities right now 
 
 From left: Amilia Madigan, age 11, and her mother Desy Stoyanov cool off from the heat using the water sprinklers at Golden Gate Park on Friday, ... more Photo: Santiago Mejia, The Chronicle Buy this photo 
 
 Image 2 of 28 Fresno 
 
 High temperature on Friday, Sep. 1: 106 
 
 Data from Weather Underground Fresno 
 
 High temperature on Friday, Sep. 1: 106 
 
 Data from Weather Underground Photo: Justin Sullivan, Getty Images 
 
 Image 3 of 28 Los Angeles 
 
 High temperature: 100 Los Angeles 
 
 High temperature: 100 Photo: Nick Ut, Associated Press 
 
 Image 4 of 28 Sacramento 
 
 High temperature: 103 Sacramento 
 
 High temperature: 103 Photo: Richard Cummins/Getty Images/Lonely Planet Images 
 
 Image 5 of 28 
 
 Image 6 of 28 Miami 
 
 High temperature: 89 Miami 
 
 High temperature: 89 Photo: THOMAS SWICK 
 
 Image 7 of 28 Tucson 
 
 High temperature: 102 Tucson 
 
 High temperature: 102 Photo: Walter Bibikow/Getty Images/AWL Images RM 
 
 Image 8 of 28 Reno High temperature: 93 Reno High temperature: 93 
 
 Image 9 of 28 San Diego High temperature: 95 San Diego High temperature: 95 Photo: Stuart Westmorland, Getty Images 
 
 Image 10 of 28 
 
 Image 11 of 28 San Antonio 
 
 High temperature: 96 San Antonio 
 
 High temperature: 96 Photo: JERRY LARA, San Antonio Express-News 
 
 Image 12 of 28 Dallas, TX 
 
 High temperature: 92 Dallas, TX 
 
 High temperature: 92 Photo: Brandon Wade, SPECIAL/BRANDON WADE 
 
 Image 13 of 28 Salt Lake City, UT 
 
 High temperature: 86 Salt Lake City, UT 
 
 High temperature: 86 Photo: Joel Addams/Getty Images/Aurora Creative 
 
 Image 14 of 28 Kansas City, MO 
 
 High temperature: 80 Kansas City, MO 
 
 High temperature: 80 Photo: Visions Of America/UIG Via Getty Images 
 
 Image 15 of 28 
 
 Image 16 of 28 Orlando 
 
 High temperature: 96 Orlando 
 
 High temperature: 96 Photo: Jeff Greenberg, Getty Images 
 
 Image 17 of 28 New Orleans 
 
 High temperature: 89 New Orleans 
 
 High temperature: 89 Photo: Mario Tama, Getty Images 
 
 Image 18 of 28 Jacksonville, Fla. 
 
 High temperature: 91 Jacksonville, Fla. 
 
 High temperature: 91 Photo: Henryk Sadura/Getty Images/Tetra Images RF 
 
 Image 19 of 28 Buy photo Jordan Towers of San Francisco finds a cool spot from the rising temperatures at the fountain in the Yerba Buena Gardens along third St. in downtown San Francisco, Ca. on Fri. September 1, 2017. Jordan Towers of San Francisco finds a cool spot from the rising temperatures at the fountain in the Yerba Buena Gardens along third St. in downtown San Francisco, Ca. on Fri. September 1, 2017. Photo: Michael Macor, The Chronicle Buy this photo 
 
 Image 20 of 28 
 
 Image 21 of 28 Buy photo Dave and Julie Peitsch, visiting from Washington D.C., take a water break while playing tennis at the Walnut Creek Tennis Center as temperatures hit the triple digits in Walnut Creek, Calif., on Friday September 1, 2017. less Dave and Julie Peitsch, visiting from Washington D.C., take a water break while playing tennis at the Walnut Creek Tennis Center as temperatures hit the triple digits in Walnut Creek, Calif., on Friday ... more Photo: Michael Short, Special To The Chronicle Buy this photo 
 
 Image 22 of 28 Buy photo A worker rinses off cars at a Mercedes Benz dealership as temperatures hit the triple digits in Walnut Creek, Calif., on Friday September 1, 2017. (did not wish to be named) A worker rinses off cars at a Mercedes Benz dealership as temperatures hit the triple digits in Walnut Creek, Calif., on Friday September 1, 2017. (did not wish to be named) Photo: Michael Short, Special To The Chronicle Buy this photo 
 
 Image 23 of 28 Buy photo Lisa Hauptman of Santa Rosa hydrates and takes cover from the sun under a tree at Golden Gate Park on Friday, Sept. 1, 2017, in San Francisco, Calif. The National Weather Service issued an excessive heat warning as the San Francisco Bay Area reached temperatures in the upper 90s and some areas surpassed 100 degrees. less Lisa Hauptman of Santa Rosa hydrates and takes cover from the sun under a tree at Golden Gate Park on Friday, Sept. 1, 2017, in San Francisco, Calif. The National Weather Service issued an excessive heat ... more Photo: Santiago Mejia, The Chronicle Buy this photo 
 
 Image 24 of 28 Buy photo Brea Muldavian of Alameda, cools of in the shade of a gazebo at Civic Park as temperatures hit the triple digits in Walnut Creek, Calif., on Friday September 1, 2017. Brea Muldavian of Alameda, cools of in the shade of a gazebo at Civic Park as temperatures hit the triple digits in Walnut Creek, Calif., on Friday September 1, 2017. Photo: Michael Short, Special To The Chronicle Buy this photo 
 
 Image 25 of 28 
 
 Image 26 of 28 Buy photo A cooling station is seen at the Civic Park Community Center as temperatures hit the triple digits in Walnut Creek, Calif., on Friday September 1, 2017. A cooling station is seen at the Civic Park Community Center as temperatures hit the triple digits in Walnut Creek, Calif., on Friday September 1, 2017. Photo: Michael Short, Special To The Chronicle Buy this photo 
 
 Image 27 of 28 Buy photo A woman walks past the temperature displayed at the First Republic Bank in Walnut Creek, Calif., on Friday September 1, 2017. A woman walks past the temperature displayed at the First Republic Bank in Walnut Creek, Calif., on Friday September 1, 2017. Photo: Michael Short, Special To The Chronicle Buy this photo
– "NEW RECORDS SET FOR THE DAY, MONTH AND ALL TIME!" tweeted the Bay Area National Weather Service Friday. And what a record San Francisco's was: The city recorded a temp of 106 degrees Fahrenheit, up three degrees over the previous all-time record set on June 14, 2000, and significantly higher than the city's previous record for Sept. 1: 90 degrees Fahrenheit, which was recorded in 1950, reports the AP. The temperature was only 10 degrees below the highest temperature recorded in America on Friday, notes the NWS, with Death Valley hitting 116 degrees. And the San Francisco Chronicle pointed out that even "those desert-dwelling folks at Burning Man" had a much cooler day, experiencing temperatures of about 94 degrees. A break is coming for San Francisco, but not the region. The AP reports temperatures could be in excess of 110 on Saturday in Sacramento, with areas inland from the San Francisco Bay Area potentially notching 115, a temperature last recorded in 1950. San Francisco, however, will see a return to its cool-and-foggy normal, with a huge temperature drop into the 80s expected, followed by days in the 70s. The National Weather Service has attributed the heat wave to high pressure over the West, and sees more heat in the cards when remnants of Tropical Storm Lidia move north from Mexico's Baja California over the weekend. (Death Valley recorded a brutal heat milestone in August.)