If they have access to dirt, shade and fresh water they will be fine. Chickens originated from tropical climates - they were first domesticated in India, Thailand, Burma and Indonesia.
Lulu mine survived the heat fine last year. Just hid in a really shady patch of the garden and wandered around with their beaks open and wings held up which looked pretty funny. I noticed they dust-bathed more too which i wouldn't think would help but they seemed to like it! I guess if they're free-ranging, they'll find a spot that suits their needs.
I think the dust bathing cools them down because the dirt is cool. If you dig down a cm or so below the surface it's usually cooler than on the surface.
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