Fall outdoor wedding...yay or nay?

You can rent outdoor heaters for an afternoon (they are very efficent and you can get styles that don't look industrial), you could also have a tent on standby for rain. I went to one outdoor ceremony in the fall and honestly the whole time I was just thinking, OMG I wish this would hurry up and get over! I was so cold and uncomfortable I didn't pay one bit of attention to the ceremony and I'm sure I'm not the only one.