May weather forecast
Vientiane, Laos

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

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 (3.35") in April to 246mm (9.69"). A marked increase in humidity accompanies this shift to the monsoon season, with the relative humidity reaching 78%. The lush green scenery after the rain showers leaves Laos at its most beautiful, making it a popular time for photographers and nature lovers to visit. Outdoor exploration, however, requires careful planning due to the heavy rainfall.

Temperature

With May's arrival, Vientiane notes an average high-temperature of a still tropical 33°C (91.4°F), closely following the trend of the preceding month. During the month of May, the nighttime temperature in Vientiane falls to an average of 24.6°C (76.3°F).

Heat index

The heat index for May is computed to be a life-threatening hot 47°C (116.6°F). Attention: Heat exhaustion and heat cramps are anticipated. Prolonged effort can result in heatstroke.
The standards for the heat index are set for locations in shade and under light breezes. With exposure to direct sunshine, the heat index could climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', gives a temperature feeling by integrating air temperature and humidity. The impact of weather is personal, differing among a variety of people based on differences in body mass, height, and the level of physical exertion. It is essential to be conscious of the fact that direct sunlight can intensify the felt heat, leading to an elevation in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it's vital to remain hydrated, particularly during prolonged physical activities.
When it comes to cooling down, the human body's primary method is through perspiration, making use of sweat evaporation to eliminate excess heat. With excessive moisture in the atmosphere, the effectiveness of the evaporation process is decreased, causing the body to cool down less efficiently, leading to a sensation of overheating. Heat-related complications, like dehydration, can manifest if the body's heat gain exceeds its dissipation capacity.

Humidity

The average relative humidity in May in Vientiane is 78%.

Rainfall

In Vientiane, in May, it is raining for 15 days, with typically 246mm (9.69") of accumulated precipitation. In Vientiane, during the entire year, the rain falls for 118 days and collects up to 1661mm (65.39") of precipitation.

Daylight

In Vientiane, the average length of the day in May is 12h and 59min.
On the first day of May in Vientiane, Laos, sunrise is at 05:42 and sunset at 18:30. On the last day of the month, sunrise is at 05:33 and sunset at 18:41 +07.

Sunshine

In Vientiane, the average sunshine in May is 6.7h.

UV index

The months with the highest UV index are March through September, with an average maximum UV index of 12. A UV Index reading of 11, and higher, represents an extreme health hazard from unsafe exposure to UV radiation for the average person.
Note: A maximum high daily UV index of 12 during May translates into the following directions:
Ensure every key safety measure. People with light skin might sustain burns in fewer than 5 minutes. Stay in the shade and limit sun exposure from 10 a.m. to 4 p.m., when UV radiation is most potent. Keep in mind that shade structures like parasols or canopies do not offer full protection. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Sunscreen with an SPF of 30 or higher should be applied generously and frequently reapplied even on cloudy days, especially after each swim or outdoor workout.
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Frequently asked questions

How hot does it get in Vientiane in May?

In May, the average high-temperature and low-temperature in Vientiane are 33°C (91.4°F) and 24.6°C (76.3°F) respectively. The average heat index (a.k.a. 'feels like', 'real feel'), which combines air temperature and relative humidity, in May is computed to be 47°C (116.6°F).

What is the average humidity in May in Vientiane?

In Vientiane, Laos, the average relative humidity in May is 78%.

How many days does it rain in May in Vientiane?

In Vientiane, in May, during 15 rainfall days, 246mm (9.69") of precipitation is typically accumulated.

What is the average length of the day in May in Vientiane?

In May, the average day length in Vientiane, Laos, is 12h and 59min.

When is the sunrise / sunset in May in Vientiane?

In May, on the first day of the month, sunrise is at 05:42 and sunset at 18:30. On the last day of the month, in Vientiane, Laos, sunrise is at 05:33 and sunset at 18:41 +07.

How long on average sun shines in May in Vientiane?

In May, the average sunshine duration in Vientiane is 6.7h.

When is the highest UV index in Vientiane?

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

How high is the UV index in May in Vientiane?

In Vientiane, Laos, the average daily maximum UV index in May is 12. A UV Index value of 11, and more, symbolizes an ultimate hazard to health from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average UV index

Average temperature in May
Vientiane, Laos

Average temperature in May - Vientiane, Laos
  • Average high temperature in May: 33°C

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).

  • Average low temperature in May: 24.6°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).

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Average humidity in May
Vientiane, Laos

Average humidity in May - Vientiane, Laos
  • Average humidity in May: 78%

The month with the highest relative humidity is August (84%).
The month with the lowest relative humidity is March (66%).

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Average rainfall in May
Vientiane, Laos

Average rainfall in May - Vientiane, Laos
  • Average rainfall in May: 245.8mm

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

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Average rainfall days in May
Vientiane, Laos

Average rainfall days in May - Vientiane, Laos
  • Average rainfall days in May: 15 days

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).

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Average daylight in May /
Average sunshine in May
Vientiane, Laos

Average daylight in May / Average sunshine in May - Vientiane, Laos
  • Average daylight in May: 13h and 0min

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).

  • Average sunshine in May: 6h and 4min

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).

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Average UV index in May
Vientiane, Laos

Average UV index in May - Vientiane, Laos
  • Average UV index in May: 12

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).

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Vientiane, Laos

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