It's seems that is a lesson that needs to be learned at least once the hard way. Provided everyone has the necessary supplies, I've come to enjoy the reasonably bad weather trips. As long as everyone is warm and dry, I enjoy lounging around camp shooting the breeze. Sometimes it can be just as refreshing as whatever activity was planned.
Labor Day weekend on the Canadian border can get PRETTY nippy!
And a 4 man rainfly on a 6 man tent doesn't protect quite enough. A few of my campmates had a LONG 4 days before we were due to be picked up again! (Soggy sleeping bags are NO fun and impossible to dry!)