San Francisco sees hottest day of 2024 as heatwave scorches US south-west

Excessive heat warnings bring elevated wildfire risk, potential for power outages and rising death toll

San Francisco recorded its hottest day of the year on Tuesday, and Phoenix set a record for the hottest 1 October on record, as the National Weather Service predicted record-high fall temperatures across the south-western US.

With temperatures hitting 100F (38C) or higher in many places, officials and local media outlets issued warnings that the heat posed a significant threat to property or life". Excessive heat warnings were in place across the region, bringing with it warnings about elevated wildfire risk, the potential for sweeping power outages in California and a rising toll of heat-related deaths, a particularly deadly risk for unhoused people and the elderly.