A prolonged October heat wave continued across Southern California on Sunday, with temperatures running 15 to 27 degrees above normal and more records at risk. Extreme heat warnings remained in effect through 8 p.m. Thursday for coastal and valley areas of Los Angeles and Orange counties.

Saturday saw several daily records fall. Hollywood Burbank Airport reached 102 degrees, surpassing the 1943 mark of 101. Anaheim hit 105 degrees, breaking the 2014 record of 103. Santa Ana recorded 107 degrees, topping the prior 2014 high of 102. Record high minimum temperatures were also set in Anaheim, Santa Ana, and Newport Beach.

Additional records were broken Friday in downtown Los Angeles, Long Beach, Anaheim, and Santa Ana. The heat wave has placed alerts on roughly 37 million people across California, with highs forecast in the 90s to low 100s for valleys and many coastal spots through Monday.

The National Weather Service described the event as a major, long-lasting episode driven by an anomalous ridge over the western United States. Overnight lows have remained unusually high, compounding discomfort. Some relief is expected by Thursday, with significant cooling arriving by the following weekend.

Power grids face added strain from air conditioning demand, while wildfire risk stays elevated in dry conditions. Forecasters noted the heat could persist into the second week of October in parts of the state.