The climate of Laos is tropical in most of the plains, while it's subtropical in the far north and in the mountains, and it is governed by the monsoons. The winter monsoon, which brings good weather, though a bit cool at night, from November to February, and the summer monsoon, which brings rainfall and high humidity from May to the beginning or the middle of October. However, the monsoons are quite irregular: they do not always arrive in the same period, and they don't always have the same intensity.
The period from March to May, before the rains, is the hottest of the year, and it is still dry, but with some thunderstorms in the afternoon; the summer months are less hot, with highs around 30/32 °C (86/90 °F), but with higher moisture. April is the hottest month, with average highs about 35 °C (95 °F), but with peaks of 40/42 °C (104/108 °F) in the center-south, and up to 45 °C (113 °F) in the north, which has a greater continentality. In May, the temperature begins to decrease in the south, while in the north, where the monsoon arrives later, it's still very hot, especially in the first part.
In Laos, the amount of rainfall is normally between 1,200 and 2,200 millimeters (47 and 87 inches) per year in the plains, and may exceed 3,000 mm (118 in) on the most exposed mountain slopes. The rainiest months are usually August and September, which correspond to the final period of the monsoon, also because of typhoons (see below), which bring an additional amount of rain.

Index

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• The north - Luang Prabang, Bounneua
• The center-south - Vientiane, Pakxe
• Typhoons
• Best Time
• What to pack

The north

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Luang Prabang

During winter, nights are cool in the north: in Luang Prabang, they are around 14/15 °C (57/59 °F) from December to February, but with peaks near the freezing point; highs are around 27/28 °C (81/82 °F) in December and January, while as early as in February they reach 31 °C (88 °F). Sometimes, during the day it can get hot even in winter.
Here are the average temperatures of Luang Prabang.

In Luang Prabang, 1,250 mm (49 in) of rain fall per year, so we are in one of the least rainy areas.

In the north, the amount of sunshine is not very good because even in the dry season the sky is often cloudy; in the extreme north, in winter there's often a dull weather and there can be some drizzle; sometimes this can also happen in Luang Prabang and in the rest of the north. During the period of the summer monsoon, cloudiness prevails throughout the country, although sometimes the sun can come out. Here are the sunshine hours in Luang Prabang.

Bounneua

Laos, a landlocked country, is mountainous and covered with forests, and it's home to several parks and protected areas. In general, the climate becomes milder with increasing altitude, but it is even more rainy, with the first pre-monsoon showers more frequent than in the plains, and definitely abundant rains in the monsoon period.
Here are the mean temperatures of Boun Neua, located in the far north, at 900 meters (3,000 feet) above sea level.

At high altitudes, it can get cold even during the day in the winter months, especially in the north. The highest peak is Phou Bia, 2,819 meters (9,249 feet) high.

The center-south

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In the center-south (see Vientiane, Savannakhet), the winter temperatures are slightly higher, and outbreaks of cold air are less frequent and less intense.

Vientiane

Here are the average temperatures of the capital, Vientiane.

In Vientiane, 1,600 mm (63 in) of rain fall per year; the rains are abundant from May to September, while they are rare from November to March. Here is the average precipitation.

In the center-south, the sun frequently shines in the dry season, from November to April.

Pakxe

In the far south (see Pakxe), winter is even warmer, actually it's quite hot; in fact, highs are normally around 30/31 °C (86/88 °F) even in December and January.

The rains in Pakxe are abundant, since they amount to 2,000 mm (80 in) per year; from June to September, they even exceed 300 mm (12 in) per month. However, here too, from November to March it rains very rarely.
In the dry period, in Pakxe the sun shines even more often than in Vientiane and in the center of the country.

Typhoons

Laos can be reached by typhoons, the tropical cyclones of south-east Asia, which come from the South China Sea, and affect more directly the coast of Vietnam, though they can bring wind and heavy rainfall also in Laos. Typically, typhoons affect Laos from May 20 to December 15; the north is hit more often than the south.
More rarely, the north-west may be affected by the remains of cyclones coming from the Bay of Bengal, which may also pass from the second half of April onwards, as happened with Typhoon Nargis in early May 2008.
Not only tropical cyclones but also waves of bad weather during the monsoon season may cause flooding, for example the overflowing of the great river that runs through the country from north to south, the Mekong.

Best Time

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The best time to visit Laos is from November to February, since it is the coolest part of the dry season. In November, however, typhoons or tropical storms may still affect the country, and sometimes even in the first half of December. In February, usually the temperature begins to rise, and can exceed 35 °C (95 °F); consequently, the best time is from mid-December to late January, though sometimes it can get hot even in January, but the humidity is not high and nights remain cool. It is worth while to recall that in winter it can get cold at night across the country, in fact the minimum temperature can drop below 10 °C (50 °F), but especially in the north, where it can drop in some cases to as low as the freezing point.
In March and April, and also in May until the arrival of the monsoon, it's uncomfortably hot in the lowlands, while in the mountains the heat it's more bearable. The weather is still good, although during the afternoon there may be some showers and thunderstorms.
During the rainy season, from May to September, the heat is sweltering, at least in the lowlands, the sky is often cloudy, and sometimes torrential rains can make travelling difficult; in the brief periods of good weather, which last a few days, the heat returns to be intense.

What to pack

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In winter: in the north (see Luang Prabang), bring light clothes for the day, a jacket and a sweater for the evening, a raincoat for the drizzle; in the northern cities above 1,000 meters (3,300 feet), spring/autumn clothes, a warm jacket and a sweater for the evening.
For the south-central plains (Vientiane, Savannakhet, Pakxe), light clothing, a light sweatshirt for the evening, possibly a light jacket or a sweater for cooler evenings. For the highest peaks, warm clothes, such as a down jacket, a hat, gloves.
In summer: all over the country, at low altitude, bring lightweight clothing of natural fibres, a light raincoat or umbrella, a light sweater for the evening. Above 1,000 meters (3,300 feet) you can add a sweatshirt and a light jacket. For the highest peaks, warm clothes, such as a sweater, a raincoat, hiking shoes.
Before entering pagodas, it is customary to remove shoes, dress neatly and cover a little.