Not at all, but if you do, make sure it is a winterizer based fertilizer. That will help the lawn prep for the cold. The weed control is not so important at this point, as most weeds are annual plants, therefore they die when exposed to a frost. But for your bi-annual and perennial weeds it will help. also putting down some pre-emergent now and again in the early spring will help with your grassy weeds (crabgrass, foxtail, ect.).
If you are seeding at all, its best to do this in the fall vs the spring, and you would want to hold off on the weed control if you are putting seed down.