During the northern hemisphere summer, the winds blow from the south bringing heavy rain due to the moisture they pick up from the sea, whilst in winter the winds blow from the north, from inland areas and so they are dry.
This is what happens as a rule but many factors are influencing the climate, and it can vary significantly from one year to the next.
Basically, Thailand can be said to have three seasons.
» A short, warm, dry summer that lasts three months: March, April and May*.
» Followed by the rainy season that lasts four months: June, July, August and September.
» Finally, the cold, or rather the cool season extends over the remaining five months, from October* to February. Mild, sunny weather makes this time of the year the high season for tourism.
* The months of May and October mark the change, the beginning and the end of the monsoons.