The climate of Vietnam varies considerably from region to region. 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 climate varies greatly from north to south. The north has a cool and dry season from November to April and a hot rainy season from May to October. The central coast north of Nha Trang has a similar climate with the winter monsoon bringing cool, wet weather between December and February. The south is hot and humid all year round, especially from February to May. The rainy season lasts from May to November. The central highlands have a similar climate to the south, but it is cooler and temperatures can be freezing in winter. The official peak season in Vietnam is from September to April.
Hanoi has a humid tropical climate, characterised by monsoons, like most of northern Vietnam. Summers, between May and September, are very hot with plenty of rain, while winters, from November to March, are cold and relatively dry. During the transition months of April and October anything is possible, and spring often brings light rain. The hottest month of the year is June. January is the coolest month, usually beset with a cold north-easterly wind.
Ho Chi Minh City is in the tropics, and very close to the sea, so its climate is steadily warm to hot all year round. Temperatures are slightly cooler between December and April, which is also the dry season. Rains begin in May and become heavy from June to August, but the showers are sudden and short, with the sun usually reappearing fairly quickly. There is a danger of typhoons from July to November.
The budget travel & cheap tours in Vietnam 2007 - 2013