Ryan, in my experience, if you water, do it really early in the morning, and just a bit of water each time you water - not like other plants in this way. I also find if I water all of them a little, then go back and rewater, this gives the water time to absorb into the soil a bit so the second watering gets to the roots as needed. I only water a small amount when I water.
Also though I think shade is more important than water when it is so sunny out.
I think it was Paul (in Antelope CA) who said he does 50% shade cloth, during hot days. I know that I think about shading my semps during our hottest days of summer but usually don't and I get some losses. The plants are more susceptible to sun damage being in pots (I think, since they have smaller root systems) but watering while the plants are in full sun doesn't seem to help.
That's my opinion on this topic, hoping other's give their 2 cents as well!
Good luck
