PHOENIX - The city of Yuma heated up to a record-setting temperature Wednesday, while Phoenix came close to breaking its own.
The National Weather Service says Yuma hit a high of 117 Wednesday, surpassing the record of 115 set on July 23 in 1959.
Phoenix tied the day's record of 114, which was set in 2006.
The heat certainly didn't stop hikers hitting the trail at Echo Canyon at Camelback Mountain in Phoenix.
Several signs were posted at the trailhead warning hikers of the severe heat and dangers.
"I thought it was going to be cloudy like it was yesterday, it wasn't but I was already out here so what are you going to do, I did have a gallon of water with me and I've been out here like 30 to 40 times before," said Phoenix Resident Ralph Yun. "It was tough, but I am good."
Others admitted they made a mistake trying to make the hike.
"That was the dumbest thing I ever did, don't hike Camelback if it's anything over 100-degrees," said a Los Angeles man vacationing in Phoenix.
According to Phoenix Fire Department spokesperson Michelle Miller, so far this year Phoenix fire crews have responded to 133 mountain rescues. That compares to 153 mountain rescues for all of 2013.
Just on Wednesday, Phoenix firefighters responded to 30 heat-related calls.
Captain Troy Caskey says in these extreme heat conditions extra precautions are taken for firefighters.
Crews rotate every 30 minutes.
There are also rehab stations on site, equipped with water, ice, and food.
Firefighters vitals are checked before they're allowed to go back into a fire.
The city and parts of southwestern Arizona are under an excessive heat warning much of Wednesday due to temperatures that will range from between 112 to 118 in low desert locations.
The warning issued by the National Weather Service runs from 10 a.m. to 8 p.m. Thursday.
Meanwhile, a high pollution advisory for ozone is in effect for the Phoenix area for Wednesday due to high temperatures and a shift in air flow.