An unprecedented heatwave has gripped southern California, with temperatures 15 to 20 degrees above normal for autumn. Extreme heat warnings are in place along the coast from Santa Barbara to San Diego through Thursday.
On Monday, Downtown Los Angeles recorded a high of 104F (40C), surpassing the previous 5 October record of 101F (38.3C) set in 1953. Santa Ana, located about 30 miles south of Los Angeles, experienced a record 106F (41.1C) day, exceeding its 1953 high of 103F (39.4C), according to the National Weather Service (NWS).
The NWS attributes this blistering spell to a ridge of high pressure, which traps hot air over the region. Overnight temperatures in San Diego and Los Angeles are forecasted to remain in the mid to upper 70s, offering little relief.
The current heatwave has set records not only for its high temperatures but also for its duration. Los Angeles has recorded four consecutive days of 100F or more, marking the longest streak of triple-digit temperatures in October.
California’s coastal areas are expected to see cooler temperatures starting on Thursday, with rain forecasted for next week. Interior regions of the state may also experience cooler conditions on Friday and Saturday.