Fall foliage contrasting with Washington, D.C.'s marble monuments, is at its peak in the mildly cool October. Average low temperatures drop to the fifties, and the afternoons and evenings tend to be breezy. Rain marks its presence occasionally, and it is advisable to dress in warm clothes. Make the most of the warmth before the arrival of winter - walk around, enjoy the picturesque surroundings, or take a guided Washington, D.C. tour.