Vietnam is largely a tropical monsoon country. In the north, a hot rainy season prevails from May to September. The average temperature in Hanoi is about 86°F during this period, with very high humidity. During the cooler, dry season in the north from December to March, the average temperature is 68°F, with overnight minimums sometimes around 40°–42°F.
In the south, Ho Chi Minh City and the Mekong Delta experience a year-round tropical climate with daily temperatures normally exceeding 88°F. The rainy season in Danang and Hue in the center of the country lasts from October to March.