I've spent time in Darwin in the wet and for a southerner its less than pleasant.
It is stinkin hot (well 33, but Darwin is either 33 with rain or 32 without) will flog down rain and the temp doesn't drop much at all. Then you try and sleep in a puddle of sweat in a poorly ventilated canvas sauna while mozzies try and chew on you.
The Wet also means cyclones, they are unpredictable and even a Cat 1 is more than a match for a tent. If you don't have a solid house to stick yourself and gear in, then heading south to get away from it is one of your few options. Unfortunately when it rains a lot you can get stuck south of Katherine and it can be up to a week before you can get back up. Some employers aren't keen on you disappearing for a few days, especially when the cyclone warning you evacuated for comes to nothing.
So, yeah, I'd look for a house with an aircon in the bedroom as a minimum.