Temperatures are expected to begin falling on Friday, when highs will be 10 degrees lower than Wednesday in several areas, but still above the norm.
The National Weather Service in Phoenix said it couldn't rule out the possibility of hitting 90 with 89 as the current expected high.
The current record for Sunday (November 26) is 72° set in 1998.
A mini heat wave has set the stage for an uncommonly warm Thanksgiving Day in the Southland, where some longtime holiday heat records could fall. The record for November 23 is 78 set in 1932.
It's being caused by an upper-level ridge of high pressure that has parked itself over Southern California, trapping warm desert air.
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Temperatures should start to dip as next week arrives, with forecast highs of 74 degrees on Monday and 66 degrees on Tuesday. Highs are expected to top 95 in some areas Wednesday and Thursday, especially in the Inland Empire.
Temperatures soared into the 90s from Los Angeles to San Diego and up the Central Coast to the Bay Area on Wednesday, while much of the rest of the state basked in unseasonably balmy weather.
The National Weather Service says downtown Los Angeles could reach 90 degrees, a record.
Saturday will bring mostly sunny and seasonably warmer conditions with highs topping out in the lower to possibly mid-70s.
Records were also set in Long Beach, where the temperature reached 96 and topped the 2015 record of 88. A shower or two may precede its passage later in the day, but Saturday will still probably be the better weekend day in terms of sunshine and temperatures.