April weather forecast
Vientiane, Laos

April brings about the highest average temperatures in Vientiane between 23.8°C to 34.3°C along with an increase in rainfall from 34mm in March to 85mm. 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, recognised by an average high temperature of 34.3°C and a low of 23.8°C, is Vientiane's warmest month.

Heat index

The heat index in April is computed to be a burning hot 47°C. Stay wary: Heat exhaustion and heat cramps are possible. Heatstroke can ensue from extended effort.
Given the heat index, its values are aligned with shaded sites and gentle winds. If directly exposed to the sun, the heat index could rise by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is an aggregate value of air's warmth and moisture to show the human-felt temperature. Elements such as metabolic variations, pregnancy, and physical exertion can shape one's weather perception. Awareness of direct sun exposure is crucial as it has the potential to heighten the weather's effects, pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Young individuals are generally in more danger than adults due to their lower capacity to sweat. Moreover, their large skin surface in relation to their small bodies and the increased heat generation from their activities makes them more vulnerable.
To offset high temperatures, the human body releases sweat which, upon evaporation, cools it down. When the air contains significant moisture, the efficiency of the evaporation process decreases, preventing the body from cooling down effectively and creating a feeling of overheating. Heat-related challenges, like dehydration, can be anticipated when body heat isn't managed effectively.

Humidity

The average relative humidity in April is 69%.

Rainfall

In April, the rain falls for 8 days. Throughout April, 85mm of precipitation is accumulated. In Vientiane, during the entire year, the rain falls for 118 days and collects up to 1661mm of precipitation.

Daylight

In April, the average length of the day in Vientiane is 12h and 33min.
On the first day of the month, sunrise is at 06:04 and sunset at 18:22. On the last day of April, sunrise is at 05:43 and sunset at 18:29 +07.

Sunshine

The average sunshine in April 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 estimate of 11, and higher, represents an excessive health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: During April, 12 as the daily maximum UV index converts into the following advice:
Put into effect every essential safeguard, as unprotected skin and eyes might burn instantly. Stay out of direct sunlight and seek shade between 10 a.m. and 4 p.m., when UV radiation is strongest, but remember that shade devices may not offer full sun protection. Employ a wide-brim hat for potent defense against up to 50% of UV rays. One should apply and reapply liberally a broad-spectrum sunscreen of SPF 30+ every two hours and immediately after a swim or an outdoor exercise.