Amid a scorching heat wave, Phoenix firefighters are responding to heat-related emergency calls, especially among people ...

Phoenix set a new daily temperature record Aug. 6, reaching a sizzling 116 degrees as dangerous heat continues to blanket the ...

High temperatures are expected to be even warmer next week. More First Alert weather days have been issued for Tuesday ...

August will arrive in Phoenix in a wave of above-normal temperatures, with highs over 110 degrees into next week.

Phoenix just reached 118 degrees on Thursday, recording their hottest August temperature on record. It broke a 4-way tie of 117 degrees, with all of those readings coming since 2011, including two ...

In Arizona, public health officials warn extreme heat in Maricopa County has led to the suspected deaths of over 400 people ...

Overnight lows will be near records for this time of year, as temperatures are only expected to cool to the low 90s.

An unbearable heat wave gripping much of the southwestern United States is expected to peak Thursday, Aug. 7, as temperatures climb well over triple digits.

A heat dome building on the western side of the United States may break records this week, surging temperatures to 119 degrees in California.

The process is officially known as evapotranspiration, which is how plants, including corn, release water vapor into the atmosphere.