Climate of Halong City has typical character of oceanic temperature type with two separate seasons: summer lasts from May to October and winter is from November to April next year.
Located in tropical zone, Halong City receives average radiation 115.4 kcal/cm². Average annually temperature is 23ºC, the highest peak in June (28.6ºC) and the lowest point in February (16.7ºC). The yearly average humidity is 82.7%.
Due to of geography, Halong City is affected by North-East wind in winter and South-West wind in summer.