I'm in the Bay Area and don't have A/C. My heat lamp is on a theromstat, so it's not going on at all (I have it set to 86 in the center of the tank). Due to the heat, there is no real gradient, but his entire enclosure is in the high 80's. To be honest, i'm not too worried about it. The temps are hot for me, but for him, they are about right. Would be nice if the cooler side could be more cool, but high 80's all over isn't bad for a few days. The humidity is really high today cause it's actually lightly raining. High 70's at 9AM with rain, it's like I live in FL or something. Made his tank rocket up to 85% humidity. I have a small computer fan on one of his side vents that I manually turn on and off to help control humidity... I turned it on for a bit and got it down to about 60% and shut it off.
TBH, i'm more worried about my baby corn snake I got 4 days ago. Seems pretty hot for a tiny baby corn. But he seems to be doing OK. Even having him only 4 days i've been holding him for 5-10 minutes a couple times a day and offered him his first pinky this morning and he ate it. I think he's gonna be a very easy and docile guy already.