Well....shade would help of course, maybe give them morning sunlight then move them into shade in the afternoon.
What color are the pots they’re in? Dark colors get hot, light colors reflect light instead of absorbing it.
The ground stays nice and cool a couple feet down, plants can deal with high temps better if the roots are cool, maybe just plant them in the ground, get rid of the pots.
That’s about all I can think of. You cant fight nature, gotta go with the flow ya know. :)
good luck.