Is 100 degree weather too hot for a cornsnake?

Hello!

I have a beautiful cornsnake and he is a year old. He has never missed a meal, sheds in one piece every time, and currently weighs 110g. He normally stays burrowed in his bedding during the day and wanders at night. Where I live right now (California) it is very hot. Today it reached 105 degrees and it looks like the heat will persist. I have no doubt there will be plenty of other days where it is over 100 degrees. I have an under-tank heating pad that I normally keep at 85 degrees, but today I used a temperature sensor to measure how hot it was in his viv and it showed his bedding was 90 degrees throughout. Should I turn off the heating pad? Is this temperature a concern for my snake? He doesn't have a cooler place to be and I am worried it is too hot for him. I spray water in his viv to keep it humid during this dry season and to hopefully help cool things off. Is there anything else I can do or should be doing? I appreciate any advice.

I'm also in California and typically in summer I turn off the heat to my corns entirely because my house rarely gets below 75 even at night and is often 85+ during the day.

When the temps reach the 90's around my area in Florida the corns burrow under leaf litter and hug the cooler ground. Definitely turn off the heat pad as Shiari suggested. If you have room under your vivarium you could place a cold pack during the day. I used thin cold packs when my air conditioning died and I had to keep incubated eggs cooler for a day or two. The ones I used were refrozen again after use.

If he spends time laying in or on the water dish, he will be trying to tell you that he isn't comfortable.