I think it’s more dangerous for those of us from out of town/state, as the lack of humidity means you don’t sweat (or at least the same) so by the time you know your thirty it’s probably to late. I visited Arizona like 10 years back in like April and it was insanely hot already, and we kept an emergency case of water in the trunk of the car (on advice from a family member living there) and anytime we did any hiking we had camel packs and water bottles too as backup because we knew you had to just keep drinking.
It was funny though because Sedona was like the middle of a really hot summer in the north east, but they had ice in parts of the canyon still.