Climate and monthly weather forecast
Vientiane, Laos

Water geysers around the memorial Patuxay Monument in Vientiane, Laos
Water geysers around the memorial Patuxay Monument in Vientiane, Laos

The climate of Vientiane

The geographical position of Vientiane places it in the heart of Laos. Its climatic conditions are mirrored in the tropical wet and dry or savanna climate, otherwise known as the Köppen climate classification Aw. These climatic conditions mold the city's overall weather patterns throughout the year.

Throughout the year, Vientiane experiences warm temperatures. The value ranges from a low average of 16.4°C in January to a high average of 34.3°C in April. Climatological data indicates relative humidity stays above 66% throughout the year, reaching up to 84% in August, affirming a consistently humid environment.

A unique attribute of Vientiane's weather is the considerable variability in monthly rainfall. Rainfall is minimal in the initial months of the year, with January observing a low of 8mm. This figure escalates drastically in the middle of the year, reaching its peak in August, a robust 335mm. The number of rainfall days follows a similar pattern, starting with only one day in January, then extending to 21 days by August. Despite the high volumes of rainfall, the city receives generous sunshine hours ranging from 4.4h in August to 8.3h in December and a UV index always matching or exceeding eight, cautioning residents and visitors about potential sun exposure dangers.

The best time to visit Vientiane

Vientiane offers the most favorable weather conditions and temperatures to visitors in the late autumn transitioning into the winter. Specifically starting from November to February. This period is characterized by cool temperature ranges from 28.1°C to 30.8°C. This time frame also offers the least rainfall, ranging from 3mm to 78mm, with the number of rainfall days not surpassing nine days, making it an ideal time for outdoor activities and sightseeing.

The worst time to visit Vientiane

The period from May to October could be challenging for visitors not accustomed to high humidity and heavy rainfall. During these months, the temperatures hover between 31.3°C to 34.3°C. The period also marks the start of the monsoon season, and the city experiences its maximum rainfall from 246mm in May to 335mm in August, which is coupled with up to 21 rainfall days per month. This humid, wet weather might not be preferable for outdoor explorations and may restrict the travelling experience.

Spring weather in Vientiane

In Vientiane, spring extends from March to May. This period observes an upward trend in temperatures, starting from 33°C in March and peaking at 34.3°C in April, before a small decrease down to 33°C in May. Additionally, this period also spells the onset of the monsoon, as rainfall increases drastically from 34mm in March to 246mm in May. This transition period offers a blend of dry and wet climates, with increasing daylight hours from 12h in March to 13h in May.

Summer weather in Vientiane

The summer months in Vientiane, from June to August, bring high humidity levels and peak rainfall. Average temperatures during this period range from 31.3°C to 30.8°C. Meanwhile, rainfall jumps further from 280mm in June to a staggering high of 335mm in August. These heavy showers increase the humidity, hovering between 82% to 84%, consecutively making this period the wettest season of the year.

Autumn weather in Vientiane

Autumn in Vientiane, observed from September to November, is characterized by a steady decrease in temperatures and rainfall. Temperatures hover between 30.9°C to 29.8°C, making the weather gradually comfortable. Rainfall sees a sharp decrease from 297mm in September to only 11mm in November, with the number of rainy days dropping from 17 to just two. Therefore, this period provides a sigh of relief after the heavy summer monsoon showers.

Winter weather in Vientiane

Winter, from December to February, hosts the coolest months in Vientiane, with average temperatures ranging from 28.1°C to 30.3°C. In December, the city experiences the least amount of rainfall in the year, pegged at merely 3mm, with January not far behind, boasting only 8mm, providing plenty of opportunities to engage in outdoor activities. These cool, dry months make the winter season a popular choice for visitors seeking respite from cold winters in other parts of the world.

Weather in January

January, typically a dry month in Vientiane, Laos, experiences temperatures ranging from 16.4°C to 28.4°C. Cooler than the ensuing February, it boasts a moderate UV index and is less humid. The relatively low humidity makes for comfortable conditions, while the lengthy daylight hours facilitate outdoor activities. Weather in January »

Weather in February

February witnesses a slight incline in temperatures compared to January, with the onset of a warmer season in Vientiane, Laos. This month also experiences a marginal increase in daylight hours from 11.2 to 11.6 hours and a relative humidity of 68%. Weather in February »

Weather in March

March in Vientiane, Laos experiences a significant rise in temperatures, signifying the transition into the hotter months of the year. This month sees average temperatures fluctuating between 21.5°C and 33°C and records a UV index of 12, which is the maximum for the year. Weather in March »

Weather in April

April brings about the highest average temperatures in Vientiane between 23.8°C to 34.3°C along with an increase in rainfall from 34mm in March to 85mm. It heralds the arrival of the monsoon season, paving the way for an uptick in humidity in the coming months. Weather in April »

Weather in May

The weather in May in Vientiane, Laos, continues to intensify, with relatively high temperatures and a considerable increase in rainfall from 85mm in April to 246mm. A marked increase in humidity accompanies this shift to the monsoon season, with the relative humidity reaching 78%. Weather in May »

Weather in June

As the year progresses, June sees a drop in the average hours of sunshine in Vientiane, Laos. Coupled with escalating rainfall from 246mm in May to 280mm and temperatures ranging between 24.9°C and 31.9°C, the weather is notably humid. Weather in June »

Weather in July

July marks the midpoint of the year with an increment in rain in Vientiane, Laos. The shift from 280mm in June to 272mm entails higher levels of humidity, an 82% relative humidity. Despite the prevailing rains and the high humidity, the city remains bustling and active. Weather in July »

Weather in August

August in Vientiane, Laos, denotes the peak of the rainy and monsoon season with rainfall figures standing at 335mm. With higher rainfall and a steady temperature hovering between 24.6°C and 30.8°C, humidity rises, impacting overall comfort slightly. Weather in August »

Weather in September

September witnesses a reduction in the rainfall from 335mm in August to a more manageable 297mm in Vientiane, Laos. This drop in rainfall comes with a slight decrease in temperatures and relative humidity. The weather signals the impending arrival of the cooler months, which citizens anticipate eagerly. Weather in September »

Weather in October

October in Vientiane, Laos, marks the cessation of the monsoon season, leading to considerably less rainfall compared to September. Temperatures, however, remain steady between 22.9°C and 30.8°C. The decrease in the frequency and intensity of rain showers lends itself to a more comfortable, less humid climate. Weather in October »

Weather in November

November commences the return of drier conditions and a drop in rainfall from 78mm in October to 11mm, with temperatures between 19.3°C and 29.8°C in Vientiane, Laos. The declining temperature and sustained drying trend give rise to a pleasant climate perfect for tourism. Weather in November »

Weather in December

December brings the year to a close with the lowest average rainfall of 3mm and temperatures ranging from 16.7°C to 28.1°C in Vientiane, Laos. The climate is characterized by relatively cooler temperatures and less rain, marking the arrival of the region's winter season. Weather in December »


How much does it rain in Vientiane?

Throughout the year, in Vientiane, there are 118 rainfall days, and 1661mm of precipitation is accumulated.

What is the least humid month in Vientiane?

With an average relative humidity of 66%, March is the least humid month in Vientiane, Laos.

What are the months with the highest UV index in Vientiane?

March through September, with an average maximum UV index of 12, are months with the highest UV index in Vientiane.

What time of the year is the hottest in Vientiane?

In Vientiane, April is the warmest month, with temperatures averaging a high of 34.3°C and a low of 23.8°C.

When are the longest days in Vientiane?

With an average of 13h and 12min of daylight, June has the longest days of the year in Vientiane.

What is the most humid month in Vientiane?

With an average relative humidity of 84%, August is the most humid month.

What is the rainiest month in Vientiane?

The month with the most rainfall is August, when the rain falls for 21 days and typically aggregates up to 335mm of precipitation.

What is the month with the least sunshine in Vientiane?

The month with the least sunshine in Vientiane is August, with an average of 4.4h of sunshine.

What time of the year is the coldest in Vientiane?

In Vientiane, December is the coldest month, with temperatures averaging a high of 28.1°C and a low of 16.7°C.

What is the driest month in Vientiane?

December is the month with the least rainfall in Vientiane, Laos. Rain falls for 1 days and accumulates 3mm of precipitation.

What is the month with the shortest days in Vientiane?

With an average of 11h and 6min of daylight, December has the shortest days of the year.

Is there Daylight Saving Time (DST) in Vientiane?

Vientiane, Laos, does not utilize Daylight Saving Time (DST). +07 timezone is used over the entire year.

What month has the most sunshine in Vientiane?

The month with the most sunshine is December, with an average of 8.3h of sunshine.

When is the lowest UV index in Vientiane?

December is the month with the lowest UV index in Vientiane, Laos, with an average maximum UV index of 8.

Average temperature
Vientiane, Laos

Average temperature - Vientiane, Laos

The warmest month (with the highest average high temperature) is April (34.3°C).
The month with the lowest average high temperature is December (28.1°C).

The month with the highest average low temperature is June (24.9°C).
The coldest month (with the lowest average low temperature) is January (16.4°C).


Average rainfall
Vientiane, Laos

Average rainfall - Vientiane, Laos

The wettest month (with the highest rainfall) is August (334.6mm).
The driest month (with the least rainfall) is December (2.5mm).


Average rainfall days
Vientiane, Laos

Average rainfall days - Vientiane, Laos

The month with the highest number of rainy days is August (21 days).
The months with the least rainy days are January and December (1 days).


Average daylight / Average sunshine
Vientiane, Laos

Average daylight / Average sunshine - Vientiane, Laos

The month with the longest days is June (Average daylight: 13h and 12min).
The month with the shortest days is December (Average daylight: 11h and 6min).

The month with the most sunshine is December (Average sunshine: 8h and 18min).
The month with the least sunshine is August (Average sunshine: 4h and 24min).


Average UV index
Vientiane, Laos

Average UV index - Vientiane, Laos

The months with the highest UV index are March, April, May, June, July, August and September (UV index 12).
The month with the lowest UV index is December (UV index 8).


Vientiane, Laos

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