The charm of Hanoi is that it has four seasons

Hanoi features a warm humid subtropical climate. Unlike Ho Chi Minh City, Hanoi has four distinct seasons.

Summer (May to August)

Summers are hot with high rainfall. July is the hottest month of the year.
Showers is one feature of Hanoi’s summer, so don’t forget to bring a raincoat or an umbrella with you whenever leaving hotel.

Fall (Mid-September to the end of November)

It's the best season for tourists to visit Hanoi. It is charming with warm sunlight, cool breeze and dry atmosphere.
You should bring thin jackets because the weather is rather cold.

Winter (December to February)

Winters are bitter cold and relatively dry. Many days are cloudy.
You'd better bring warm clothes if you don't want to get a cold in a tropical country.
You can warm up yourself by enjoying Hanoi's famous street food in the chilly days.

Spring (February to April)

Spring is short. It often brings light rain.
It is the best time for tourists to witness the vitality of tropical nature.