The annual monsoon cycles that affect all of mainland Southeast Asian Produce a ‘dry and wet monsoon climate’ with three basic seasons for most of Laos. The southeast monsoon arrives in Laos between May and July and lasts into November.

The monsoon is followed by a dry period (from November to May), beginning with lower relative temperatures and cool breezes created by Asia’s northeast monsoon (which bypasses most of Laos),lasting until mid-February. Exceptions to this general pattern include Xieng Khuang, Hua Phan and Phongsali Provinces, which may receive rainfall coming from Vietnam And china during the months of April and May.

Rainfall varies substantially according to latitude and altitude, with the highlands of Vientiane, Bolikhamsai, Khmmuan and eastern Champasak Provinces Receiving the most.