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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).
Sea temperature in Vietnam (Nha Trang) in January: 24.9Â°C, 76.8Â°F. Average rainfall in Vietnam in January: 18mm, 0.7in. Note: Most of Vietnam experiences dry weather during January, making this a good month for Vietnam beach holidays on the coastal resorts and islands.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.