Laos has a monsoon climate of a dry and a wet season. The rainy season starts from May to October, when the climate is hot and wet along with an average Temperature around 28oC. The cool dry season is from November through February. The background temperature is stable around 15oC in early morning and at night, 25oC at noon. The mountainous areas can be very cold with the temperature decreases to 5oC especially in the North of Laos
From March to April, the weather becomes hotter and drier with the peak temperature can be up to 40oC…
Best time to go
– The best time to visit Laos is between November and April.
– The hot season from March to May is very dry and certain river trips are not possible.
Vientiane’s climate chart
See more at: http://www.climatemps.com/