Many/most figs originated in hot dry climates in the Mideast or central Asia, so the leaves may not be an indicator of a problem, per se, but just a natural response to the conditions. If the trees are otherwise healthy and productive, I wouldn't fuss over the leaf behavior.
If the fruit is not taking the weather well, that is a different issue. I know at USDA/UC Davis if the temps spike during the ripening time, the fruit will be sunburned where it is not well enough protected from the sun by the leaf canopy. The fruit is often quite fine, but the skin is a little more leathery. Last summer some of the fruit, if picked in the afternoon was quite hot and seemed almost cooked inside. Some of this can be moderated by a healthy and lush canopy which protects the fruit. I don't know that any of the varieties was more immune to this kind of weather, more so than others.
Obviously any tree in a hot, and especially low-humidity climate will struggle to stay hydrated when transpiration from the leaves exceeds the ability of the roots to take up replacement moisture. Tree health is probably the best defense.
Mild sunburn.

Heavier sunburn
