Watermelon in the fall?

Well........ let's just say that I got my seeds in a bit late this spring. Right now the stores and fruit stands are beginning to sell huge, delicious watermelon. This little fella' is the largest of my crop. :-) I just noticed it yesterday, and I'm thrilled, as only a gardener can be. There are lots of flowers on the vines, so I'm hoping for a bumper crop. Will anyone be up for a fall picnic?