Vietnam’s weather varies from the sub-tropics in the North to the tropics in the South. The humidity is high, with average ranging around 84% a year.  Moderated by two monsoons, the average temperature (from 22 to 27) is lower than other countries also in the equatorial regions. The weather varies greatly from North to South, depending on elevation and type of landscape.
Northern weather
Northern Vietnam has four seasons with a cold winter and hot summer. The temperature ranges from 5-6C in winter to up to 35C in summer. The further North it is, the colder it gets. In mountainous regions in the far North (such as Sapa) the temperature some times drops below zero. Rainy months are August, October, November. February and March have persistent, light, drizzling rain.
Central Vietnam
Temperatures are high all year round. The temperature tends to be warmer and more humid than the South in the middle of the year and cooler during the dry season from November to April. Flooding may occur from October to December.
Southern Vietnam
Has a distinct dry season (from November to April) and wet season (from May to October). Average temperature ranges from 25-30C. During wet months, heavy and short downpours may occur in mid-afternoons.