Autumn and spring are the best seasons to visit Hanoi. The climate is pleasant and the temperature milder during these two season. Hanoi should not be mistaken to be a country where you can wear shorts and T shirt all year long, since it is located in SoutheastAsia. During the winters, Hanoi can get as cold as 10 degrees C and the summers can get as hot as 28-35 degrees C. Hanoi has high humidity year round. The peak rainy season for Hanoi is from May to September though it can get showers in the summer months.