I used to keep my Veild outside from April to November in Alabama. I'd bring her in once night temps dropped below 60ish.
(My poor old Veiled was 9 years old when I decided she was too [bleep]y to die. She had deteriorating vision, couldn't project her tongue out anymore, and was veeeery slow moving. She solved her problem for a while by, well, sitting in her feeding tub and just biting at her crickets and wax worms as they went by. She stayed in healthy weight for another year untill I noticed she couldn't climb back up to her favorite perch anymore. I had to take her in to be put down because she wouldn't die! She was mean as hell and I loved her to death
)
Anyway, I built a 3x3x4 foot tall wooden screen cage. It was on 6 inch legs to keep it off the ground when the occasional rain brought a torrential little floor river through my yard. I had the door open from the top half of one of the sides with just a regular latch, any old thing will do. You can get a locking one if you worry about theft or children. The screen was 1/4inch with black plastic coating to keep any sharp edges from hurting feet/tail/nose in climbing. I used 2x1's in the construction, with a piece of plywood on the floor. It was sealed with holes drilled in for drainage.
When it rained for more than 4 days I'd bring her in for some basking time in her indoor enclosure. I still fed with a big rubbermaid tub, you just have to watch that it doesn't fill up with water before your cham can get its food. She had a ficus and umbrella tree in there, with some lateral sticks and some slanted vines for crusing around.
Watch for neighborhood cats...And watch if people around you use chemlawn or other lawn services. The chemicals can sometimes float in the wind and you cham can accidentally ingest some via drinking.
I also second the auto sprinklers. I had mine set to go off a few minutes after noon. Enough to cool down her spot when it got into the 100's, but not enough to ruin her sun. And then later around 4. I'd throw some ice cubes on top of her cage in the morning when I'd check on her and give her breakfest.
Aside from that, I think you'll find your chameleons will enjoy your location. Have fun with these guy!