Players have no negative consequences from wearing armor while in a hot environment but hot environments cause dehydration after time. Preferably dehydration only occurs in hot environments. Jumping in water could lower the overheating which would not cause more dehydration to occur but wouldn't lower any existing dehydration.

If the player is wet, it already lowers the overheating/dehydration rate and in hot environments the dehydration increase is the negative effect of wearing an armor :)

But can it be set so dehydration only occurs in hot environments? I don't want to get dehydrated in cold or temperate environments.

Probably fixed with 699a933