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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 temperature in Vietnam is high. The annual average temperatures range from 22oC to 27oC. However, the average temperature is different in every place. In Hanoi the average temperature is 23oC, in Ho Chi Minh City 26oC and 25oC in Hue.Some places like Dalat and Sapa have a maximum temperature of 20oC in the summer. Every year there are 100 rainy days and the average rainfall is 1,500 to 2,000mm. The humidity ranges around 80%.ietnam is affected by the monsoon, that's why the average temperature is lower than the other countries which are located in the same longitude in Asian. In comparing with these countries, the temperature in winter is colder and in summer is less hotter in Vietnam.