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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).
Haiphong City's average temperatures are much cooler than the average temperatures in Ho Chi Minh City, especially during the winter months. June and July both have average high temperatures of 80 degrees and average low temperatures of 79 degrees.o Chih Minh City. April is the month with the warmest average high temperature in Ho Chi Ming City. The average high temperature for the month is 95 degrees, and the average low is 79 degrees.