Best time to visit Laos: weather and seasons by month

Laos has three seasons rather than four: a cool dry season from November to February, a hot dry season from March to May, and a wet season from roughly May to October. The table below is the quick read; the detail follows.

Prices track crowds closely. December, January and April are the most expensive months for beds and transport; March, May, June, July and September are the cheapest.

Start with the region. The north — Luang Prabang, Nong Khiaw, Luang Namtha, Phonsavan — has cool, misty mornings in December and January, near 10 °C at altitude, and a burning season from February to April that brings thick smoke. The centre — Vientiane, Vang Vieng, Thakhek — is dry and pleasant from November to February, tops 37 °C in April, and makes the Thakhek Loop hard in the rains. The south — Pakse, the Bolaven Plateau, the 4,000 Islands — is the hottest region in April, cooler and wetter on the plateau, and the river islands partly flood at high water.

Then match the month to what you want to do. Trekking and temple days in Luang Prabang are best from November to February. Slow boats on the Mekong run well on high water in July and August, when road legs take longer. Waterfalls are at their fullest in the green season, but Kuang Si turns brown and fast after heavy rain. The railway keeps running through the wet season, which makes it the reliable spine of a rainy-month trip.

Finally, check the calendar before you lock dates. Pi Mai Lao, 13–16 April, is the biggest disruption: water throwing everywhere, Luang Prabang processions, and trains, buses and rooms sold out with shops closed. The That Luang festival in Vientiane in November and Boun Ok Phansa in October fill hotels near the sites for a few days. Chinese and Vietnamese New Year in January or February closes some shops in Vientiane and Pakse.

If your dates are fixed by work or school holidays, the wet season is workable rather than wasted: fewer crowds, lower prices, full waterfalls and a green landscape, at the cost of muddy roads and afternoon downpours.

Smoke, not rain, is the main weather risk for a first trip. The burning season in the north runs from February to April, and flights to Luang Prabang can be delayed when haze is thick. If you are travelling in March, the south is usually clearer than the north.

Rain in Laos tends to fall in heavy bursts rather than all day, so a wet-season trip is rarely a washout. The real cost is transport: mountain roads are slower and landslides are possible in August and September, while the train keeps its schedule.

Festival dates follow the lunar calendar and shift each year, so confirm the exact days before booking around Boun Wat Phou, Boun Ok Phansa or That Luang. Prices in this guide are 2026 estimates; check current fares and room rates when you book.

Cash is kip and ATMs are thin outside the main towns, which matters more in low season when some guesthouses and restaurants close. Sort your visa and entry paperwork before you commit to dates.