Vietnam experiences a fair degree of diversity in climate. The north has
distinct summer and winter seasons some lasts from May until October,
when the weather is hot and very humid with temperatures averaging about
30 degrees Celsius. November to April are the winter months when the
temperature is mainly dry and average temperatures are about 18-20
degrees Celsius. Please note that in the mountainous regions of the
country, temperatures will be much lower than this, so warm clothing is
required if you are traveling to hill tribe areas during the winter
months.
The North ( From Northern mountains to Danang)
Areas
north of the 18th Parallel have two seasons: winter and summer. Winter
last from around November to April, quite cool and wet, February and
March are marked by a persistent drizzling rain. The hot summer runs
from May to October, very high humidity and it is also the season of
occasional typhoons.
The Central ( From Danang to Nha trang)
Nha
Trang and north central coastal lowlands have a long dry season from
late January to October, accompanied by fog and fine drizzle. Other
coastal lowlands are denied significant rainfall from the southwestern
monsoon (April or May to October) by the Truong Son Mountain Range. It
is very wet period. Dalat like the rest of central hightlands is much
cooler than the Mekong Delta and the coastal strip. Its dry season is
from December to March.
The South ( From Nha Trang to Mekong Delta )
The
South has two main seasons: the wet and the dry. The wet season last
from May to November (June to August are wettest months). There are
heavy but short lived downpours almost daily, in the afternoon.
The
dry season runs from December to April (Late February to May are
hottest and very humid). It is also the begining of rainy season. In Ho
Chi Minh City, average annual temperature is 27°C, average humidity is
80% and annual rainfall averages 1979 mm.