In reply to Mike Nolan:
I've been to the area you intend going. In June there was enough snow to ski for miles although it was softish. And it was sunny enough to get our eyes burnt the once (twice shy!)
The DNT huts are luxurious and there was no one using the one or two we stayed in which meant we had to dig now in the entrance out of one.
Can't comment on the public bus service but the drive from Bergen was stunning!