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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).
In the capital Hanoi, situated towards the north of the country, average temperature is 21C in November. Temperatures begin to cool in the following months and the comfortable temperatures and low rainfall make it a great time to visit. Hanoi averages 17C in January, the coolest month of the year.he north of the country is a fair bit cooler than the south and has much more marked seasonal variations. For example average temperature in Hanoi in the north varies form 17C in January to 28C in July and August while Ho Chi Minh City in the south sees monthly averages range between 25C and 30C.