April weather forecast
Vientiane, Laos

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

Weather in April

April, the same as March, in Vientiane, Laos, is another hot spring month, with temperature in the range of an average high of 34.3°C (93.7°F) and an average low of 23.8°C (74.8°F).

Temperature

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

Heat index

In April, the average heat index is evaluated at a blazing hot 47.3°C (117.1°F). Beware: Heat cramps and heat exhaustion are very likely. Heatstroke is imminent with prolonged activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With 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 'felt air temperature', 'feels like', 'real feel', or 'apparent temperature', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. This effect is individual, with diverse people perceiving weather differently for numerous reasons (clothing, wind, differences in body mass, height, and shape), and activity. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. 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

In April, the average relative humidity in Vientiane, Laos, is 69%.

Rainfall

In Vientiane, during 8 rainfall days, 84.9mm (3.34") of precipitation is typically accumulated. In Vientiane, during the entire year, the rain falls for 118 days and collects up to 1660.5mm (65.37") of precipitation.

Daylight

In Vientiane, the average length of the day in April is 12h and 33min.
On the first day of April in Vientiane, Laos, sunrise is at 06:03 and sunset at 18:22. On the last day of the month, sunrise is at 05:43 and sunset at 18:30 +07.

Sunshine

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

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 excessive health risk from exposure to the Sun's UV rays for the average person.
Note: In April, the average maximum UV index of 12 translate into the following recommendations:
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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim.
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FAQ

What is the warmest month in Vientiane?

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

What is the temperature in April in Vientiane?

In Vientiane, Laos, in April, the average high-temperature is 34.3°C (93.7°F), and the average low-temperature is 23.8°C (74.8°F). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines air temperature and relative humidity, in April is evaluated at 47.3°C (117.1°F).

What is the average humidity in April in Vientiane?

In April, the average relative humidity in Vientiane is 69%.

How many days does it rain in April in Vientiane?

In Vientiane, during April, the rain falls for 8 days and regularly aggregates up to 84.9mm (3.34") of precipitation.

How many hours of daylight does Vientiane have in April?

The average day length in April in Vientiane, Laos, is 12h and 33min.

When are sunrise and sunset in April in Vientiane?

On the first day of April in Vientiane, Laos, sunrise is at 06:03 and sunset at 18:22. On the last day of the month, sunrise is at 05:43 and sunset at 18:30 +07.

How long on average sun shines in April in Vientiane?

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

What is the month 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.

How high is the UV index in April in Vientiane?

In Vientiane, the average daily maximum UV index in April is 12. A UV Index estimate of 11, and higher, represents an excessive health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average sunshine
Average UV index

Average temperature in April
Vientiane, Laos

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).

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Average humidity in April
Vientiane, Laos

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%).

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Average rainfall in April
Vientiane, Laos

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 least rainfall) is December (2.5mm).

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Average rainfall days in April
Vientiane, Laos

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).
The months with the least rainy days are January and December (1 days).

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

Average daylight in April / Average sunshine in April - Vientiane, Laos
  • Average daylight in April: 12h and 33min

The month with the longest days is June (Average daylight: 13h and 11min).
The month with the shortest days is December (Average daylight: 11h and 5min).

  • Average sunshine in April: 7h and 30min

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 April
Vientiane, Laos

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