Nha Trang is extremely lucky to not be influenced by monsoon winds that turn the rest of southern Vietnam into water six months every year. Nha Trang has a warm, fair and beautiful climate nearly all year round, with the exception of late October, November and early December.
The best time to visit Nha Trang would probably be March or April. The least windy months of the year are May, April and June. Nha Trang in general is not windy ennough to windsurf, with the exception of Doc Lep beach (35 km north of Nha Trang), which is usually reserved for experts.