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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).
Hanoi Weather Forecast. Providing a local 3 hourly Hanoi weather forecast of rain, sun, wind, humidity and temperature. The Long-range 10 day forecast also includes detail for Hanoi weather today. Live weather reports from Hanoi weather stations and weather warnings that include risk of thunder, high UV index and forecast gales. See the links below the 10-day Hanoi weather forecast table for other cities and towns nearby along with weather conditions for local outdoor activities. Hanoi is 10 m above sea level and located at 21.02Â° N 105.87Â° E. Hanoi has a population of 1431270. Local time in Hanoi is +07.