I just learned recently WHY all my succulents (sedum, graptopetlaum, echeveria, crassula, etc) all die at the end of summer.
They are fine taking most of the heat in the day. But the reason they can do that is because they 'breathe' at night. When the temps climb up over 90 at night, they can't breathe and die.
Which means I get to haul in my potted plants (in various and sundry combinations) twice a year. Once for the annual dip below 32 degrees at night, and once for the week or more that the temps are over 90 at night.
While I'm happy to know my plants at least have a chance this year, my spousal unit gets grumpy with the house starts to resemble 'a jungle'.