FlytrapCare Carnivorous Plant Forums

I grew them in Utah, there's not a lot you can do if you intend to grow them outside in Arizona.
Some don't need the higher humidity to do well, it's just a byproduct of their natural environment. Others, depending of how much surface area they have (think Sarrs) can suffer when humidity gets low due to transpiration. They simply lose water from the leaves faster than the roots can replace it. If it gets too low, any carnivorous plant will suffer, they simply aren't adapted to the environment like the native plants in the desert southwest.
You could try to surround them with water, such as creating a platform that the pots could sit in inside of a kiddie pool. You could fill the pool with the hose, but the trays the pots sit in with distilled water. This could create a very localized area of higher humidity, but when it's August in Arizona, that will be about as worthwhile as a velvet painting of a whale and a dolphin gettin' it on.
Your best bet would likely get a small greenhouse to contain the humidity, but with a cooling system that would not let the temps get anywhere near the 9,628 degrees that you'll see.