wow. even in early august? then i must go hokkaido.
Aug is the super peak season in Hokkaido. You'd be hard pressed to find a hotel room in most of their cities and towns, much less any good deals to go with it.
FYI humidity is quite low (but not as bone dry as eastern USA) over there so you won't feel mucky like in SG. This is why Hokkaido temp and weather is much sought after by everyne