Phoenix summers are known for brutal heat, but the nights are no longer offering much relief — and the data shows this year is among the worst on record for overnight lows.
Since June 1, overnight lows in the Valley are averaging 84.5 degrees. There have been 14 nights that stayed below 80 degrees, 8 that climbed above 90, and 1 that exceeded 95.
This summer ranks fifth hottest on record for overnight lows. The highest average summer low ever recorded was in 2024, at 87.5 degrees. Every one of the top five hottest summers for overnight lows has happened this decade…