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Yeah it's too hot even for those resistant plants, here in summer also they suffered a bit, so I had to water them a bit, now just with some rain and the breeze they seem to be very happy there. Thanks!

Is there any variety which can tolerate this high temperature?

Not sure at least about succulents, maybe some... because even in some deserts there are some plants, otherwise... cactus. Or put those plants inside, in a cooler place.