Phoenix, Arizona experienced a record number of consecutive 100-plus-degree days in 2024. Triple-digit highs lasted for 113 days, stretching into the fall. The prior record, set in 1993, was 76 consecutive days. 

Phoenix also generally saw more days, 70 in total, with maximum temperatures above 110 degrees than any other year during the National Weather Service’s period of record, from 1896 to 2023. The last record, set in 2023, was 55 days. Phoenix also experienced 21 straight days of either tied or record-breaking high temperatures from the end of September through mid-October. 

As the climate changes, heat waves have been getting longer, more frequent and more intense in metropolitan areas like Phoenix. This year, these trends were coupled with a relatively dry monsoon season, meaning fewer rainy days of relief. 

This fact brief responds to conversations such as this one. 

The Arizona Center for Investigative Reporting partners with Gigafact to produce fact briefs, or quick-response fact checks, about trending claims relating to Arizona.