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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).
Temperature remains almost constant in Saigon, rain or shine, while in Hanoi there is a marked cooler season from the chilled winds blowing down from China, from November through March and warmer period during the summer (cooler is relative, you will not likely need a jacket aside from Hanoi and Halong Bay).