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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).
The average low temperature in January in Da Nang is 67 degrees, and the average high temperature is 77 degrees. June and July are the city's two warmest months. Both of these months have an average high of 93 degrees and an average low 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.