Anyone visit the Uzbek desert fortresses in June?

I'm considering a trip to Uzbekistan this June with a routing of Tashkent -> Khiva -> Bukhara -> Samarkand -> Tashkent

I understand that June can be quite hot in Uzbekistan, and the travel weather sites show that Khiva and Bukhara can reach 100 F (38 C). What I'm not finding is weather information for the desert fortress (such as Ayaz Qala) that we would visit as a daytrip from Khiva. I would expect these might be even hotter than Khiva, but how much so? I'm hoping there's someone on this forum who has visited the desert fortresses in June or other summer month and can comment.