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1 The average annual temperature in Hanoi, Vietnam is fairly hot at 24.1 degrees Celsius (75.4 degrees Fahrenheit).2  There is a variation of mean monthly temperatures of 13 C (23.4 F) which is a low range. 3  The mean diurnal temperature variation/ range is 7.1 C (12.8 F). The hottest month (June) is very hot having a mean temperature of 30 degrees Celsius (86 degrees Fahrenheit). 2  January is the coldest month (very mild) having an average temperature of 17 degrees Celsius (62.6 degrees Fahrenheit).
Weather Overview for Hanoi. The climate of Hanoi is best described as a tropical monsoon climate, defined by two monsoon seasons: the northeast monsoon from November to April and the southwest monsoon from May to October.Hanoi is a charming city that has been dubbed by some as the Paris of the Orient.