Above 86F photosynthesis degrades, I hope I phrased that right, higher temps it will still occur. However, getting into the 100+ weather, if you are able to move them in the early afternoon to a shady spot they would probably appreciate it.
I did/do leave mine out in hot weather, as I'm kinda stuck with 3/6 being bigger than I can handle. Although, it's noticeable as the fan leaves track the sun..when it's hot, they stop.