Washington experiences a subtropical climate and four seasons. The spring and the fall seasons are warm, and winter season is cooler. Summer: Summer in Washington D.C. is humid and hot. If you have the flexibility of traveling to Washington D.C. , it is recommended that you travel to the city during the spring or fall.This is when spring offers beautiful blossoms to trees and garden around the city burst with color. The city is comfortable to walk around during the day. If you visit during fall, most of the tourists have vanished, so this means that it would be easier to visit museums and admire the sights.