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Response from Seni World 12/06/2017
Vietnam's weather differs greatly from region to region. Depending on where and when you're going to visit, make sure you prepare for the weather before you go.
North: Best time to visit is during spring (from February and April) and autumn (from September to November). The temperatures are more moderate with lighter rainfall
Central: Best time to visit is between January and August when the weather is dry with no heavy rains
South: The best time to visit the region is during the dry season, between December and April when the city experiences warm weather without rain showers.
If you're planning to visit the whole country, it is possible to travel to any part of Vietnam during any season.