Hi John and Sue.
Darwin is harder than Qld to sell your boat, but not impossible. Plenty of people have sold yachts in Darwin. There are no yacht brokers in Darwin, and most buyers will have to travel there to see your boat without a broker to show them the boat, unless you meet them there.
Sailing in Darwin during the wet season is limited to short trips out of Darwin. The wet season’s predominant W and NW wind and swell also limits the suitable anchorages. Weather also gets hot, wet and sticky.
Suggest sailing on to Qld around late October – November when the E and SE trades drop off. If you’re lucky, you might snag a W – NW breeze across the top and down the Qld coast at that time of year. But don’t rely on it – expect reasonably strong SE breezes from Cape York to Cairns. South of Cairns, the easterlies can drop off a little at that time of year.
Cheers,
Ross