Jun 18, 2025 - News
Summer nights are heatin' up
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Summer days have always been notoriously hot in the Valley, and nightfall is offering increasingly less relief from the heat.
The big picture: Summer evenings are warming up across much of the U.S. amid climate change, and in Phoenix especially, a new analysis from Climate Central shows.
By the numbers: Average Phoenix summer nighttime temperatures increased by 6.5°F between 1970-2024.
Zoom out: 96% of the 241 locations analyzed by Climate Central experienced higher nighttime summer temperatures during that period.
- Among cities with an increase, temperatures rose 3.1°F on average.
- The biggest increases were in Reno, Nevada (17.7°F); Las Vegas (10); El Paso, Texas (8.9); Salt Lake City (8.2) and Tyler, Texas (7.8).