Halong Bay’s climate is
humid and tropical. With a hot, humid summer and
dry, cold winter; Halong Bay’s temperature varies
from 15ºC to 25ºC.
Annual rainfall is between 2000mm and 2200mm.
Ha Long bay has typical diurnal tide system (tide
amplitude ranges from 3.5-4m). The salinity is from
31 to 34.5MT in dry season and lower in rainy
The Best Time to Travel to Ha Long Bay
It is possible to visit Ha Long Bay year-round, with
the best time to visit from October through April,
although during the winter months of December,
January and February, the weather in Halong Bay can
be cool and overcast with low visibility. During the
summer months from May to September, temperatures
rise and storms are more likely during the rainy
Ha Long Bay Weather in 12 Months
March April + May: Temperature: ~ 20°C-22°C; Some
days have light rain; Clear with blue sky.
June + July + Aug: Temperature: ~ 26°C-28°C with
strong Sun; Carefully with Typhoon; Some days have
strong but quick rain.
Sept + Oct + Nov: Best time to enjoy Halong with
cool temperature: ~ 26°C-28°C.
Dec + Jan + Feb: Temperature: 18°C~20°C; Cold with
strong wind; Some days are misty and rainy.