Probably yes. I wouldn't necessarily go off of what the acurite says as a reliable means of measuring the warm side. It's not designed to measure surface temps. It's basically telling you that the ambient temp in that hide is around 84 (which is fine). If you check the floor of that area with a temp gun and it's anywhere from 88-93 (94 and up is a little warm IMO) I'd say you're fine.
I should say that I don't have experience with hundreds of snakes as do some of the people on this site, and these are just my opinions.