I wonder if this is why I struggle with squash. I can grow them if I use water reservoirs but getting fruit has been hard. They go into wilt daily even with a reservoir. I'll have to try planting them earlier or later to see when they can be happy here.
It could be....Have you tried a shade cloth perhaps to block the hottest part of the day? My plants, with the exception of ONE, all look big and luscious. I've been watering them at dawn every 2-3 days. They are very green, no mildew or anything like that....And I have pulled about 6-8 zucchini off already. The one I harvested yesterday was bigger than my forearm! So I know they are capable of producing. I can only determine that they've dialed back on the female flowers because of the heat.