The ideal ranges are 78-82 cool side, 88-92 hot side. No pat of the cage should ever get above 95 or below 75. Anything in between the 2 extremes is fine.
Is it ok if the ambient temp throughout the tank is around 85?
1.0 Link, my Abbott Okeetee corn snake
1.0 Pit, my Yellow-belly ball python
1.1 Ramza and Midna, my kittens