It won't be if you're measuring the inside surface of the glass there with an accurate thermometer. Just don't let the temp exceed our recommended maximum for hot side temp. It takes more than 94/95 to burn the snake, but I wouldn't want it to be even a degree higher than that if it did burrow against the glass.
I'm using a temp gun that would count aas an accurate thermometer. Do you think if I give the substrate a couple of days it would warm up to 90 or so? My BP isn't in the tank yet so I have a couple days to mess with everything.