The country is hot and humid, with the summer months falling between June and September. The monsoon winds bring a dry season from September to December and a rainy season from March to May.
The northern highlands are generally cooler and the south receives a higher rainfall than the rest of the country, the average annual rainfall being only about 279mm.
Temperatures usually average 27.8°C in the day but may be as low as 0° in the mountain areas and as high as 46.7°C on the coastline.