Smoke from nearby wildfires will also linger to start the day but south winds may help to improve conditions later in the day.
Shortly before 4 p.m., the National Weather Service tweeted that the temperature in San Francisco had risen to 106 degrees.
High temperatures today will be 105 to 110 in Riverside and Lake Elsinore, 92 to 99 in the mountains, 109 to 114 in the San Gorgonio Pass and 109 to 114 in the Coachella Valley. The range for Napa will be between 98 and 102 degrees, he said. This break from the heat is courtesy of the remnants of Tropical Storm Lidia, which will bring an increase in moisture to the region.More news: German cities evacuate residents before World War II bombs are defused
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Most of the county remains under an excessive heat warning, which is set to expire Saturday night after being extended twice, while the mountains and beaches remain under a less serious heat advisory during the same period. The Watch runs from early Friday through Sunday evening.
Riverside broke a high heat record on Monday, in addition to a minimum temperature record of 76 degrees on Tuesday.
Because of the blazes, air quality has been rated unhealthy across the region.
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. Western Washington state expected a sunny, hot and dry Labor Day weekend.
Do not forget to take extra precautions if you will be spending time outdoors during this extreme heat.