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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).
Average temperature in Vietnam in May: 28Â°C, 82.4Â°F. Sea temperature in Vietnam (Nha Trang) in May: 28.8Â°C, 83.9Â°F. Average rainfall in Vietnam in May: 196mm, 7.7in. Note: Down south in Vietnam during May the incidence of rain increases, and conditions become very hot, damp, and sticky.ea temperature in Vietnam (Nha Trang) in October: 27.7Â°C, 81.9Â°F. Average rainfall in Vietnam in October: 99mm, 3.9in. Note: Skies begin to clear in the north of Vietnam as the rainy season tails off, bringing with it relief from the high humidity levels of previous months, although it remains hot.