I think it depends on what part of your body, but your skin won't be warmer than your insides, unless you've been out in the sun for a while. Most of the stats I can find on skin temp says 33-34 degrees celsius, which is 91-93 fahrenheit, which is still not nearly enough to burn a snake. That's also not taking into account individual differences. Even if skin temp did get up to 95, there's still not an issue with burning a snake.

(Sorry, average internal temp is 98 degrees.)