I don't! As nice as fall is to ride in, I find commuting to be a PITA with significantly colder morning temperatures than afternoon temperatures. If it were just a one way ride, or I am out riding for fun, it's great weather.
My riding tends to dip off around this time of year anyway. There's often a lot going on, all group rides are pretty much done with, and it's nice to take a break and on Saturday mornings do other things