Temps around 85f work nicely. You can offer lower in part of the habitat, and overnight, and higher in a warm area. As for going outside, look for overnight temps in the high 60's/low 70's.
Humidity is not as critical at 4 as it is for young'uns, but it should generally have access to an area of very high humidity- 80% or more. This can be a humid hide, a simulated burrow, a shady spot, or even a mud puddle. Overall humidity should be OK, say 60% or so.
As a rule of thumb, it works nicely to use reference sites, like the Library, to get the basics, then use forums like this to get ideas, clarifications, etc.