May weather forecast
Vientiane, Laos

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%. 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

The initiation of May sees an average high-temperature of a still tropical 33°C, showing minor variations from the previous month. During May nights, Vientiane records an average temperature of 24.6°C.

Heat index

In May, the average heat index is computed to be a burning hot 47°C. Take note: Heat exhaustion and heat cramps are expected. Heatstroke can occur with prolonged effort.
Understand that the heat index values take into account shaded locations and mild winds. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is the result of factoring in humidity to the air temperature, indicating perceived warmth. The impact of temperature is individual, as people's perception of weather may change based on their body mass, height, and physical activity. When directly under the sun, the weather's impact can intensify, possibly boosting the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Young ones often ignore the need to take a break and drink fluids. Thirst is a late-stage symptom of dehydration - hence, maintaining hydration, particularly during extended physical activities, is crucial.
When faced with excessive heat, the human body begins to perspire, utilizing the cooling benefits of sweat evaporation. In the presence of abundant moisture in the atmosphere, the cooling process through evaporation is hindered, causing the body to feel excessively warm. Inadequate heat shedding in the face of rising body temperatures hints at potential dehydration risks.

Humidity

In May, the average relative humidity is 78%.

Rainfall

In Vientiane, Laos, during May, the rain falls for 15 days and regularly aggregates up to 246mm of precipitation. In Vientiane, during the entire year, the rain falls for 118 days and collects up to 1661mm of precipitation.

Daylight

In May, the average length of the day in Vientiane is 12h and 59min.
On the first day of the month, sunrise is at 05:42 and sunset at 18:30. On the last day of May, sunrise is at 05:33 and sunset at 18:40 +07.

Sunshine

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

UV index

The months with the highest UV index in Vientiane, Laos, are March through September, with an average maximum UV index of 12. A UV Index value of 11, and more, symbolizes an ultimate health vulnerability from exposure to the Sun's UV radiation for the average person.
Note: A daily high UV index of 12 in May leads to these guidelines:
Execute all crucial precautions. Warding off sun exposure is non-negotiable. Attempt to stay under shade and limit exposure to the Sun between 10 a.m. and 4 p.m., when UV radiation is at its peak. Remember, devices such as parasols or canopies might not provide complete sun protection. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Broad-spectrum SPF 30+ sunscreen must be generously applied and reapplied every two hours or post any outdoor activity or swim.