The best time to visit Laos is from November to March. Temperatures are mild (about 25 degrees), and it does not rain. Landlocked Laos has a humid tropical climate influenced by the monsoons that are characterized by four periods:
The optimum time for travel in Laos is in the dry period from November through to February, when it is not too hot and rains only intermittently. Fortunately, this time coincides with most of the regional and national festivals, and also many country’s main holiday periods.
Top destination in the highland
Laos is affected by the monsoon cycles that descend all over the country. It creates wet and dry monsoon climates with usually four seasons. The rainfall during this period varies according to the latitude and altitude, which the mountains and highland register the highest falls. Beside this, there is not a big difference in the weather across Laos, as you will find in other countries like Vietnam.
In general, there is more rainfall in the highland of Laos. The eastern provinces of Champasak, and the highlands of Vientiane, Bolikhamsai, and Khammuan benefiting most with rains often around 300 cm per year.
Temperatures in the mountains of Xieng Khuang may plummet to 0°C during November to February, and areas of minor elevation to 5-10°C. Daytime temperatures during the rainy season in May to August average around 25°C.
Top destinations in lowland
Daytime temperatures during the rainy season average around 29°C in the valleys.
The capital, Vientiane, receives 200 cm and Xieng Khuang and Sainyabuli generally receive between 100 to 150 cm per annum during the wet season. Temperatures usually vary according to altitude, with the highest temperatures occurring in the humid, low lying regions of the Mekong River Valley during March and April where they often reach 38°C. The lowest temperatures of the lowland occur during December and January, sometimes as little as 15°C.