no way!? seattle welcomes you. and august is a great month to move, because just as you get settled in... you will find that september has snuck up on you, and september is just about the best month in seattle, except for, maybe, may.
when it's nice in seattle, it's the best place in the U.S. once you're settled in seattle for a few months, i'm sure you'll get several people asking you if it rains all the time. as a seattle native, the only thing i ask is that you tell these people "yes." we use the rain as a tool to weed out the douche bags ;)