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 reveals an average high-temperature of a still tropical 30.9°C (87.6°F), showing minimal difference from the prior month. Throughout April, Jakarta reports a steady low-temperature average of 25.9°C (78.6°F), slightly lower than its daytime counterpart.

Heat index

The heat index in April is calculated to be a sweltering 39°C (102.2°F). Adopt heightened preventive measures, heat exhaustion and heat cramps are probable. Persistent activity could lead to heatstroke.
In the scope of the heat index, its values resonate with shade and light wind conditions. With exposure to direct sunshine, the heat index could climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', quantifies the warmth felt when relative humidity is considered. The effect is experienced differently by individuals, hinging on unique characteristics such as body mass, stature, and level of activity. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Children regularly disregard the necessity to rest and replenish fluids. Thirst is a late symptom of dehydration - thus, maintaining hydration, particularly during long-lasting physical activities, is essential.
The innate cooling system of the human body revolves around perspiration, with the evaporation of sweat being central to this process. When relative humidity increases, the body's capacity to evaporate heat decreases, leading to a heightened sense of warmth. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

In Jakarta, the average relative humidity in April is 74%.

Rainfall

In Jakarta, during April, the rain falls for 24.8 days and regularly aggregates up to 141mm (5.55") of precipitation. In Jakarta, during the entire year, the rain falls for 252 days and collects up to 1150mm (45.28") of precipitation.

Sea temperature

The months with the warmest seawater in Jakarta, Indonesia, are April and May, with an average sea temperature of 30°C (86°F).
Note: The desire for a refreshing swim might be compromised in waters with temperatures above 30°C (86°F).

Daylight

In Jakarta, the average length of the day in April is 11h and 58min.
On the first day of April in Jakarta, sunrise is at 05:55 and sunset at 17:57. On the last day of the month, sunrise is at 05:52 and sunset at 17:46 WIB.

Sunshine

The average sunshine in April in Jakarta is 8.9h.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index. The months with the lowest UV index are January through December, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for the average person.
Note: A maximum high daily UV index of 7 during April translates into the following directions:
Continue precautions and advocate sun safety advice. Deterrence of sunburn is indispensable. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Be attentive! The UV exposure is heightened with reflections from sand and water.