The 10 hottest summers in Phoenix history: How will 2026 stack up? (opens original article in a new tab)

The National Weather Service reports that nine of Phoenix's 10 hottest summers have occurred since 2000, with 2025 being the fourth-hottest on record. The city's temperatures have steadily increased over the past century, driven by climate change and the urban heat island effect.

• Nine of Phoenix's 10 hottest summers have occurred since 2000.
• 2025 was the fourth-hottest summer on record for Phoenix.
• Phoenix's average summer temperature has risen from 89.1°F in 1924 to nearly 99°F in recent years.
• Climate change and the urban heat island effect contribute to the rising temperatures.