I've been to Borneo, so I know what hot and humid feels like.Mark, you know, only those tarantulas native to drier places can have it a bit tougher to find open water, but of course thei are native from those places, so they are gonna be fine.
Most of The rest of the NW t's, come from incredibly humid jungles, with dump areas,floded burrows,and tons of open water sources.Tons.
I have been in the Rain forest of Venezuela where its almost unbearable Mark. The temps are around 83-4 F and you cant make it because it feels WAY hotter just because of the high humidity.
You dont stop sweating and the clothing is stuck to your body.![]()
As far as arid Ts go, they make up for the lack of water by metabolizing it from their food.