In my hot and dry area, most of my semps are struggling too, so I moved some in a bit more shade. Misting them early in the morning and deep watering them ahead if I know our forecast for the week will be 95F and beyond also helps. But heat is such, so these semps knows to close up and wait for cooler conditions to return. I do not give them fertilizers. Different varieties can take a bit more sun and heat, and some just close up and wait for the cooler conditions it prefers.
At least you got some rain..nada here.
