Well, jungles are typically on the warmer side, forests not so much, but that has to due with geographical placement. Still I imagine Felarya would be pretty warm all-around just to make it easier to explain why so many giants are naked. Though, honestly, there arent giant sized cotton plants for predators to use for cloth. However, that's reserved for a different conversation...
The trees are tall and thick, often to the point of blocking out the sun, honestly, I think it'd be cool. The warmth would probably be near the tops of the trees, though heat rises, but I still cant picture the forests falling below 70 Fahrenheit (not my fault that I still use this system, blame my government) on average.