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Phoenix has never hit 110 degrees so late in September before

The Arizona sun behind a palm tree
Katherine Davis-Young/KJZZ
The Arizona sun behind a palm tree in June 2021.

After Phoenix’s hottest summer ever, fall is now off to a record-breaking start. Wednesday's temperature passed 110 degrees, setting a new record for the latest date in a year Phoenix has ever had a temperature that hot.

On average, Phoenix is done with 110-degree temperatures by late August, according to the National Weather Service. The latest Phoenix has ever hit 110 degrees before was Sept. 19, back in 2010.

National Weather Service

Wednesday’s high resets that record by six days. And the record will likely be extended even further. An excessive heat warning remains in effect through Sunday evening, with more highs above 110 expected.

Phoenix has already broken the record this year for most days above 110 degrees. As of Wednesday, 62 days this year have passed the 110 mark. On average, Phoenix typically gets just 21 days per year that hot.

Katherine Davis-Young is a senior field correspondent reporting on a variety of issues, including public health and climate change.
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