Vientiane
Laos
Long-term weather forecast
Long-term weather forecast

April weather forecast and climate
Vientiane, Laos

Water geysers around the memorial Patuxay Monument in Vientiane, Laos
Water geysers around the memorial Patuxay Monument in Vientiane, Laos
April, like March, is a hot spring month in Vientiane, Laos, with average temperature fluctuating between 34.3°C (93.7°F) and 23.8°C (74.8°F).

Temperature

April is the warmest month, with an average high-temperature of 34.3°C (93.7°F) and an average low-temperature of 23.8°C (74.8°F).

Heat index

The average heat index in April is calculated to a blazing hot 47.3°C (117.1°F). Be wary - heat exhaustion and heat cramps are highly anticipated. With continued activity, heatstroke is very likely.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'felt air temperature', 'apparent temperature', or 'real feel', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. This effect is individual, with diverse people perceiving weather differently for numerous reasons (wind, pregnancy, metabolic differences), and activity. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

The average relative humidity in April is 69%.

Rainfall

In April, in Vientiane, the rain falls for 8 days. Throughout April, 84.9mm (3.3") of precipitation is accumulated. Throughout the year, in Vientiane, there are 118 rainfall days, and 1660.5mm (65.4") of precipitation is accumulated.

Daylight

In Vientiane, Laos, the average length of the day in April is 12.6h.

Sunshine

The average sunshine in April is 7.5h.

UV index

March through September, with an average maximum UV index of 12, are months with the highest UV index. A UV Index value of 11, and more, symbolizes an ultimate health vulnerability from the exposure to the Sun's UV radiation for the average person.
Note: The average daily UV index of 12 in April transform into the following instructions:
Practice all essential precautions. Protection against sun damage is crucial. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise.

What is the warmest month in Vientiane?

April is the warmest month, with an average high-temperature of 34.3°C (93.7°F) and an average low-temperature of 23.8°C (74.8°F).

What is the temperature in April in Vientiane?

The average high-temperature, in April, in Vientiane, Laos, is 34.3°C (93.7°F), while the average low-temperature is 23.8°C (74.8°F). The average heat index (a.k.a. 'real feel', 'feels like'), that calculates temperature value influenced by the moisture in the air, in April is estimated at 47.3°C (117.1°F).

What is the average humidity in April in Vientiane?

The average relative humidity in April in Vientiane is 69%.

How many days does it rain in April in Vientiane?

In Vientiane, Laos, during April, the rain falls for 8 days and regularly aggregates up to 84.9mm (3.3") of precipitation.

How many hours of daylight does Vientiane have in April?

In Vientiane, Laos, the average length of the day in April is 12.6h.

How long on average sun shines in April in Vientiane?

In April, the average sunshine in Vientiane is 7.5h.

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

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

What is the UV index intensity in April in Vientiane?

The average daily maximum UV index in April in Vientiane, Laos, is 12. A UV Index estimate of 11, and higher, represents an extreme health threat from unsafe exposure to the Sun's UV rays.
Average temperature in April - Vientiane, Laos
  • Average high temperature in April: 34.3°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 April: 23.8°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 humidity in April - Vientiane, Laos
  • Average humidity in April: 69%

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

Average rainfall in April - Vientiane, Laos
  • Average rainfall in April: 84.9mm

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

Average rainfall days in April - Vientiane, Laos
  • Average rainfall days in April: 8 days

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

Average daylight in April / Average sunshine in April - Vientiane, Laos
  • Average daylight in April: 12.6h

The month with the longest days is June (Average daylight: 13.2h).
The month with shortest days is December (Average daylight: 11.1h).

  • Average sunshine in April: 7.5h

The month with most sunshine is December (Average sunshine: 8.3h).
The month with least sunshine is August (Average sunshine: 4.4h).

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

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).