I'm in Miami (so not the same, I know) but I've had all three melleri outside for months now, since about Feb/March, and they've all been doing super well outside. Especially my newest WC, who I purchased the previous October, has been doing so much better outside than he ever was indoors. His colors are phenomenal all the time, he's content, has a great appetite, and isn't nearly as stressed.
So yes it gets hot but between regular misting outside and lots of shade throughout most of the day they appear to be thriving. Although here in Florida summer is not just hot season but rainy season too, so it's raining most evenings. I don't know what the weather is like all summer in your area but here it cools off and rains pretty often.