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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).
Bien Hoa, Vietnam weather text for Thu 18 th January The weather is forecasted to be moderate or heavy rain shower with daytime temperature reaching 30 Â°c. Night time temperature are expected to be 25 Â°c.We expect around 1.6 mm of precipitation to fall.