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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 north of the country remains in summer meaning you can expect plenty of hot weather as well as rain and at times storms (avg temp: 30 Â°C). Halong Bay and Hanoi are prone to heavy showers at this time of year. The mountains to the north are also very wet with trekking unadvisable throughout the month.