Tours to Laos in May are slightly more popular than last month. This is due to the fact that the heat is dropping, and the height of the rainy season has not yet begun. The water in the rivers rises, you can safely swim along the Mekong and tributaries. Water sports are becoming more popular. Many people have time to go to Nam Ngum Lake, 90 km from the capital of the country, before the rains.
As for Vientiane, this city can be visited at any time of the year, there is well developed infrastructure. Prices for vacations in Laos in May slightly increase. This is just due to the growing number of guests. By the height of the rainy season, in July, they will be slightly less. Although at this time the nature of Laos blooms, and you can see all its richness and luxury.