Often travellers have many doubts about the best seasons to visit Southeast Asia …. let’s clarify.
The Monsoon is a seasonal wind accompanied by changes in atmospheric circulation and precipitation due to the heating of land and sea.
On earth, there are many monsoon areas: the Gulf of Guinea, the Gulf of Mexico, Venezuela, Australia, Somalia, Spain, Portugal and northern Russia, but the area with the heaviest monsoon is Southeast Asia, owing to the huge continental mass.

Best times to visit the Southeast Asian countries:
SRI LANKA
Southwest: from December to March
Northeast: from April to October
NEPAL
from September to November
MYANMAR – BANGLADESH
from November to February
THAILAND
North: from November to February
South: from March to May
LAOS – CAMBODIA
from November to February
VIETNAM
South: from December to April
Central Coast: from June to October
North: from May to October
MALAYSIA – INDONESIA
from May to October