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Q&AZ: Why do Phoenix streets look wet from a distance when it's hot out?

Jason Edwards
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Getty Images

This article was part of Radio Heads, the weekly newsletter from The Show. Want more good stuff like this delivered right to your inbox? Subscribe now.

If you’re walking around in Phoenix at this time of year, your eyes may try to trick you. From a distance, it might look like there's water on the street.

During the summer, air near the ground (especially near pavement) is much hotter than the air above it, causing the light passing through it to bend.

The human eye often interprets the bending light as a flat, reflective surface that resembles water — a mirage.

Mirage is a French word that traces its root back to the Latin “mirari,” which means “to marvel” to “to wonder” and also has ties to “miracle.”

Despite how cool that imagined water looks, it's important to avoid touching hot pavement in the summer. In 2024, NASA thermal imaging showed asphalt across Phoenix reached temperatures as high as 160 degrees, which can cause burns in a matter of minutes or seconds.

Data from June 19, when the daily high was 106 degrees, shows asphalt across the city that day was between 120 and 160 degrees.
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Claire Lawton is an assistant digital editor for The Show. She grew up in Phoenix, ran the arts section at a local newspaper and is back after more than a decade in New York and California.