The time to visit Vietnam depends on the area you are planning to visit as the weather affects the North and South during different times of the year. The North is clear and pleasant during the months of October, November, and December. However, the weather starts becoming warmer towards January and becomes unbearably hot in March. In the South, the best time of the year is from May to September when the weather is warm and crisp and the crowds are less. In the coastal areas, the weather is delightful from October to April but large crowds visit Vietnam during this time of the year.