Along with a change in foliage, autumn ushers in cold season. With a drop in temperature comes a drop in humidity, and cold viruses like the dry air and your dry mucus membranes.
Be sure to drink plenty of fluids to stay hydrated. Water is always a good choice, and hot tea will help to soothe a sore throat, especially if you add a squirt of honey. Steamy showers (or your head over a steamy bowl of soup) and saline nasal sprays can help ease congestion, at least temporarily, by hydrating and moisturizing irritated nasal passages. Supplement the humidity in your home with a humidifier -- not only will it help your cold symptoms, but it will also help improve your odds against catching a cold in the first place.