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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).
Hanoi: Annual Weather Averages. July is the hottest month in Hanoi with an average temperature of 29Â°C (84Â°F) and the coldest is January at 17Â°C (63Â°F) with the most daily sunshine hours at 8 in July. The wettest month is July with an average of 210mm of rain. Average Temperature: Hanoi.