April weather forecast
Jakarta, Indonesia

The transition from wet to dry season becomes more evident in Jakarta during April. While the average temperature, sea temperature and humidity remain steady, rainfall decreases compared to March. The lower rainfall and cloud coverage of 37% lead to an increase in the hours of sunshine this month. Late April marks the start of the dry season in Jakarta, making it suitable for outdoor recreational activities. The UV Index and visibility remain stable, further affirming its aptness for outdoor pursuits.

Temperature

The advent of April in Jakarta sees the average high-temperature at a still tropical 30.9°C, subtly shifted from March's 30.5°C. Jakarta registers a small shift from peak daytime temperatures, with a consistent average low-temperature of 25.9°C during April.

Heat index

The heat index in April is estimated at a sweltering 39°C. Implement more safety precautions, heat cramps and heat exhaustion may happen. Persistent activity could induce heatstroke.
It is worth noting that heat index values are gauged for conditions in the shade and light breezes. Direct sunlight exposure may result in a rise of the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is a metric representing the sensation of warmth when air temperature and moisture come together. The individual's impression of temperature can be shaped by additional aspects such as metabolic variations, physical activity, and clothing. Should you be directly under the sun, anticipate a possible increase in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Children frequently do not comprehend the need for rest and hydration. Thirst is an advanced stage of dehydration - staying hydrated, especially during extended physical exercises, is essential.
Humans rely on perspiration as a cooling mechanism, wherein the evaporating sweat counteracts excessive warmth. When there is abundant moisture in the air, the body's cooling through the evaporation process becomes less effective, leading to the sensation of overheating. Overheating can ensue when the body accumulates more heat than it can release, and dehydration severity may vary.

Humidity

The average relative humidity in April in Jakarta is 74%.

Rainfall

In Jakarta, in April, it is raining for 24.8 days, with typically 141mm of accumulated precipitation. In Jakarta, during the entire year, the rain falls for 252 days and collects up to 1150mm of precipitation.

Sea temperature

The months with the warmest seawater are April and May, with an average sea temperature of 30°C.
Note: Water sports might not feel as refreshing in waters heated beyond 30°C.

Daylight

The average length of the day in April in Jakarta is 11h and 58min.
On the first day of the month, sunrise is at 05:55 and sunset at 17:58. On the last day of April, in Jakarta, sunrise is at 05:52 and sunset at 17:46 WIB.

Sunshine

The average sunshine in April is 8.9h.

UV index

The months with the highest UV index in Jakarta, Indonesia, are January through December, with an average maximum UV index of 7. January through December, with an average maximum UV index of 7, are months with the lowest UV index. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for the average person.
Note: A maximum daily UV index of 7 during April morphs into the following directions:
Undertake protective measures and comply with sun safety rules. Shielding against skin and eye damage is essential. 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. During bright days, sunglasses that offer UVA and UVB defense are recommended. Attention! The combination of sand and water reflections enhances UV ray intensity.