Extreme heat can be deadly.
Dehydration, heat exhaustion and heat stroke are just some of the problems that can hit anyone who is exposed to high temperatures for too long.
People over 65-years-old, children under 5-years-old, people with medical conditions and people who work outdoors are the most vulnerable.
"It's particularly dangerous for folks that have outdoor occupations or that do outdoor work or even are exercising in the heat of the day if they haven't cameled up with water beforehand," said Will Humble, with ASU Health Sciences Center.
If you need to be outside, you should limit your time during peak hours, stay in the shade as much as possible and have plenty of water on hand.
In addition to the heat, there's other weather to start thinking about.
Monday is the official start of monsoon season in Arizona.
Arizona had a rough season last year with heavy rain winds and lighting, which led to a lot of flash flooding and wildfires.
The season lasts through the end of September.
Arizona Governor Doug Ducey has declared this week monsoon awareness week hoping to help keep everyone aware of the dangers of the potentially dangerous summer storms.