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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 climate for northern Vietnam, which includes the capital, Hanoi, Halong Bay and Sapa, is similar to the UK, in that it has four clear seasons. From February onwards, temperatures rise from about 18Â°C to a peak of 25Â°C in June, July and August.