In the North, the rainy season is from June until August. In summer, during these months, it’s very hot at around 30-33ºC on average and there are sometimes storms, floods. Typhoons are sometimes a problem, but quite rare.  In autumn, it is cool; the sky is green, sunny, transparent without clouds from August to November. The North can be quite chilly from December to February. The sky is always grey. The temperature drops at 14ºC, especially at 9 or 10ºC in mountainous regions such as Sapa, Cao Bang, Lang Son.

In Central Vietnam experiences a transitional climate, with heavy rainfalls between November and December and dry, hot summer months. Heavy rain and flooding can interrupt travel and Hue, Danang and Nhatrang may have to be missed if traveling overland.

In the South, temperatures are fairly constant through the year: 25-35ºC. The climate in the Mekong Delta is sub-equatorial with two main seasons. The wet season lasts from May to October with short, sharp drenching downpours occurring almost every day. The dry season runs from November to April. The hottest period is March and April. Typhoons are quite common in coastal areas between July and November.