May weather forecast
Jakarta, Indonesia

In May, the city of Jakarta experiences a relative break in the high levels of precipitation characteristic of previous months. This month showcases the onset of the dry season with a significant decrease in rainfall to 98mm (3.86"), and a reduction in cloud coverage to 29%. The weather remains warm and fairly consistent, with temperatures, wind speeds, and sea temperatures similar to those of April. Outdoor activities are favored during this time, as the number of sunshine days increases significantly. May marks the onset of clear skies and less rainy days, offering a refreshing break from the previous wet months.

Temperature

May's arrival in Jakarta brings an average high-temperature of a still tropical 31.2°C (88.2°F), slightly deviating from April's 30.9°C (87.6°F). Throughout the month of May, Jakarta reports a steady low-temperature average of 26.1°C (79°F).

Heat index

May's heat index is calculated to be a torrid 39°C (102.2°F). Greater safety measures are needed, risk of heat exhaustion and heat cramps is high. Continuous activity might trigger heatstroke.
Keep in mind the heat index values are meant for areas in shade and with light wind. The heat index may scale up by 15 Fahrenheit (8 Celsius) degrees with direct sun exposure.
Note: The heat index, also known as 'felt air temperature' or 'feels like', comes about by integrating the temperature readings with the humidity levels. The individual's temperature perception can be influenced by numerous factors such as metabolic variations, physical activity, and clothing. You should know that direct sun exposure can heighten weather effects, potentially elevating the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Juveniles often do not understand the need to recuperate and rehydrate. Thirst is a delayed symptom of dehydration - hence, it is vital to maintain hydration, particularly during ongoing physical activities.
The human body has a built-in cooling mechanism through perspiration; evaporating sweat dissipates the excess heat. When relative humidity is on the rise, it curtails evaporation, thereby reducing the heat elimination from the body and causing the feeling of being excessively hot. 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 May is 72%.

Rainfall

In Jakarta, in May, it is raining for 22.5 days, with typically 98mm (3.86") of accumulated precipitation. Throughout the year, there are 252 rainfall days, and 1150mm (45.28") of precipitation is accumulated.

Sea temperature

April and May, with an average sea temperature of 30°C (86°F), are months with the warmest seawater in Jakarta.
Note: When the water's temperature hits more than 30°C (86°F), it arguably becomes less enjoyable for cooling down.

Daylight

In Jakarta, the average length of the day in May is 11h and 50min.
On the first day of May in Jakarta, sunrise is at 05:52 and sunset at 17:46. On the last day of the month, sunrise is at 05:56 and sunset at 17:43 WIB.

Sunshine

The average sunshine in May is 9.3h.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index. 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 unsafe exposure to UV radiation for average individuals.
Note: In May, a regular UV index of 7 translates into these guidelines:
Resist extreme sun exposure. Guarding against solar damage is essential. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Be wary! Reflections from sand and water make UV radiation more intense.