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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 rainy season in the Southern Vietnam starts from the September to December and then it is the dry season from the January to August. But in Hanoi and North Vietnam, the rainy season is the period of time from the May to August. In other words, the rainy season in Hanoi is during the summer. In the summer, Hanoi temperature usually rose very high, at the midday in June and July, the temperature maybe at 39-40Â°C and even 41-42Â°C, but in the afternoon, it usually have heavy rains, thunderstorms may be occur.