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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).
When is the rainy season in Hanoi Vietnam? The rainy season in Hanoi is thing I hate most. I almost do not want to go out at this time. The weather in Hanoi is also like in Northern Vietnam with 4 clearly seasons in the year, including: spring, summer, autumn and winter.