There is direct bus from airport to your hotel, it costs HKD150 per person. You can also take bus A21 and alight at Man Ming Lane, it is around 600 meters to your hotel, you can walk there. For money changing, there are money changing in Hong Kong International Airport. It don't rain much in September, but nobody can be sure of this, but you don't need to bring to thick clothes, only summer clothes and at most a thin coat.