VIETNAM CLIMATE
There are no good or bad seasons for visiting Vietnam. When one region is wet, cold or steamy hot, there is always somewhere else that is sunny and pleasantly warm.
Vietnam has a remarkably diverse climate because of its wide range of latitudes and altitudes. Although the entire country lies in the tropics and subtropics, local conditions vary from frosty winters in the far northern hills to year-round, subequatorial warmth in the Mekong Delta.
The South Viet Nam:
With its subequatorial climate, has two main seasons: the wet and the dry.
The wet season lasts from May to November (June to August are the wettest months).
During this time, there are heavy but short-lived downpours almost daily, usually in the afternoon.
The dry season usually runs from December to April. Late February to May is hot and very humid,
but it cools down slightly when the rainy season begins.
In Ho Chi Minh city, the average annual temperature is 27 Celsius degree. In April, daily highs are usually in the low 30s. In January, the daily lows average 21 Celsius degrees.
Average humidity is 80% and annual rainfall average 1979mm.
The coldest temperature that has ever been recorded in HCM city is 14 C degree.
The Central Viet Nam:
The coastal lowlands are denied significant rainfall from the southwestern monsoon(April to October) by the Truong Son Mountain Range, which is very wet during this period. Much of the coastal strip's precipitation is brought by the northeastern monsoon between December and February. Nha Trang's long dry season lasts from late January to October, while Da Lat's dry season is from December to March. Da Lat, like the rest of the central highlands, is much cooler than the Mekong Delta and the coastal strip. From November to March, Da Lat's daily highs are usually in the low to mid-20s.
The cold and wet winter weather of the north-central coastal lowlands is accompanied by fog and fine drizzle.
The North Viet Nam:
Areas north of the 18th Parallel have two seasons: winter and summer. Winter is quite cool and wet, and usually lasts from around November to April. February and March are marked by a persistent drizzling rain that the Vietnamese call crachin. The hot summers run from May to October. The north is subject to occasional typhoons during the summer months.
Best time to travel?
High season for travel in Vietnam, Cambodia is from November through March but if you don't mind a few tropical showers here and there anytime is a good time to visit. As a rough guide the weather is dry and hot throughout the region from November to April except for central Vietnam which can be wet, and northern parts of Vietnam which are quiet cool during the winter months. The rainy season can bring heavy downpours in across most of the region from May through to October but there is also plenty of sunshine between the showers and temperatures are high. The shoulder periods of April/May and September/October, either side of the high season, can be a good time to travel.