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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 Temperatures Nearby Hanoi. 1  Kunming, China - 549.8 kms (341.6 miles) NW. 2  Kengtung, Myanmar - 648.7 kms (403.1 miles) W. 3  Chiang Rai, Thailand - 634.7 kms (394.4 miles) W. 4  Luang Prabang, Laos - 409.4 kms (254.4 miles) WSW. 5  Nan/ Muang Nan, Thailand - 590 kms (366.7 miles) WSW. 6  Phrae, Thailand - 679.2 kms (422.1 miles) WSW.