April weather forecast
Vientiane, Laos

April brings about the highest average temperatures in Vientiane between 23.8°C (74.8°F) to 34.3°C (93.7°F) along with an increase in rainfall from 34mm (1.34") in March to 85mm (3.35"). It heralds the arrival of the monsoon season, paving the way for an uptick in humidity in the coming months. Despite the heat and rainfall, the region retains its vibrant tropical allure, offering a unique experience to its travelers. The early sunsets coupled with significant rainfall make April a good time for indoor activities.

Temperature

April temperatures tend to peak at an average high of 34.3°C (93.7°F) and dip to a low of 23.8°C (74.8°F).

Heat index

In April, the heat index is computed to be a burning hot 47°C (116.6°F). Remain cautious: Heat cramps along with heat exhaustion are foreseeable. Ongoing activity may precipitate heatstroke.
In terms of the heat index, values are set with light wind and shade conditions in mind. The heat index may scale up by 15 Fahrenheit (8 Celsius) degrees with direct sun exposure.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is derived by integrating air temperature with the existing relative humidity to express the perceived warmth. The impact of weather is individual, with diverse individuals experiencing it differently due to variations in body mass, height, and activity levels. 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 hold particular importance for children. Young ones regularly neglect the requirement for rest and fluid replenishment. Thirst is a late stage of dehydration - so, it is necessary to keep hydrated, particularly during extended periods of physical exertion.
Perspiring is how the human body naturally cools down, as sweat's evaporation takes away excess heat. Relative humidity in excess curtails evaporation, therefore reducing heat dissipation from the body, leading to feelings of excess heat. The body faces dehydration threats when its cooling efforts are outpaced by excessive heat gain.

Humidity

In April, the average relative humidity is 69%.

Rainfall

In Vientiane, in April, it is raining for 8 days, with typically 85mm (3.35") 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 April, the average length of the day is 12h and 33min.
On the first day of April in Vientiane, Laos, sunrise is at 06:03 and sunset at 18:23. On the last day of the month, sunrise is at 05:43 and sunset at 18:30 +07.

Sunshine

The average sunshine in April in Vientiane is 7.5h.

UV index

March through September, with an average maximum UV index of 12, are months with the highest UV index in Vientiane, Laos. A UV Index estimate of 11, and higher, represents an ultimate health vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: In April, the maximum UV index of 12 translates into these guidelines:
Employ every precaution of importance, unprotected skin and eyes could burn within moments. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Despite the overcast weather, sunscreen with SPF of at least 30 should be applied liberally and reapplied often, particularly after swimming or an outdoor workout.