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Highs were expected to reach into the 100s in the valley, Inland Empire and high desert. According to the National Weather Service, temps could be as hot as 112 in the low desert communities. There is also the potential for record-breaking temperatures on Monday.
Officials with Cal ISO did not anticipate any Flex Alerts Sunday, but they still called on people to conserve electricity.
Red flag warnings will be in effect for Santa Clarita Valley, Los Angeles and Ventura mountains on Monday and Tuesday, when conditions are expected to be the hottest and driest of the week. Santa Ana winds may also contribute to the fire danger.
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Those visiting from cooler destinations say they were surprised by this sudden heat wave.
"It's pretty hot. You really have to try and find indoor activities. So, we came here, we saw a bit of shade at the playground so we'll be here for a little while, and I think we're probably going to go to a mall or something like that where there is good air-conditioning," said New York City resident Justin Lehman.
Health officials advised Southland residents to remain cautious in the heat, and to take extra care of the elderly, children and pets.