North Vietnam
The north of Vietnam is home to cities like Sapa, Mai Chau, Hanoi and Ha Long Bay which is definitely worth a visit. It has its hottest months of May to October; around 30 degrees. These are also the months with the highest rainfall. So if you go in the summer holidays to Vietnam and no rain will encounter is advisable not to start in the north of Vietnam.
The winter is relatively dry, but the temperature is around 20 degrees and the sun is relatively not much. Hanoi can then gray and dull. Sapa denotes approximately 1600 meters and there it is in the winter night against freezing down to.

Central Vietnam In the midst of the Vietnam daytime temperature fluctuates between 26 and 32 degrees. Most rain falls between October and December. Then there can be heavy downpours, but also prevent typhoons, which can cause a lot of inconvenience. Nha Trang, Hue and Da Nang but lasts longer rainy season from September to February. But completely rain-free, it is never here, because in the dry season can fall a heavy shower. Beside that, typhoons are coming. The typhoon season is August to November. The best time for Central Vietnam from February to May; with temperatures around 27 and less chance of rain. The dry season and the typhoon season has not yet started. If you can't really stand the heat, go between March and May. It is in the central part never completely rain-free, because in the dry season can fall a heavy shower.

South Vietnam
Southern Vietnam has a year-round average temperature of around 30 degrees. Throughout the year can also rain, but the most rainfall from May to November. In the warmest months (March, April, May), the mercury can even go toward 40 ° C. The best months to travel are December to March.
Best time to travel is during the months of December, January, February, March and April because then it is dry. CIf you can't stand extreme heat, then go between December and February.