For the local in Saigon there are only 2 seasons a, the hot and the hotter. It is always warm in this city cause it is influenced by the tropical climate in the South of Vietnam. Locals here rarely feel cold like other lands of Vietnam such as Da lat-Highland city in the South of Vietnam or Hanoi in the winter. However, from May to October is the rain season, various districts in this city will be flood and make your trip inconvenience.
The weather can be change suddenly from sunny to rainy just in a few minutes in the rain season. The best time for tourist to visit this city is from October to April.
To make sure that you have a memorable time in Vietnam you should have summer clothes and repair Warm clothes if you want to visit the North and the South of Vietnam in the same time from November to March.