September weather forecast
Ancol, Indonesia

The first month of the spring, September, is still a tropical month in Ancol, Indonesia, with an average temperature fluctuating between 23.7°C (74.7°F) and 31.8°C (89.2°F).

Temperature

September reports an average high-temperature of a still hot 31.8°C (89.2°F), slightly varied from August's 31.3°C (88.3°F). During the month of September, the temperature in Ancol falls to an average of 23.7°C (74.7°F).

Heat index

During September, the heat index is calculated to be a blisteringly hot 40°C (104°F). Undertake additional precautions, heat cramps and heat exhaustion could happen. Heatstroke could occur from sustained activity.
Thinking about the heat index, one should account for its values in shaded areas with gentle breezes. The presence of direct sunlight can raise the heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is a value derived by merging air temperature with the humidity to convey how the climate feels. The impression of weather on a person can be swayed by additional aspects, including metabolic variations, pregnancy, and activity levels. Taking into account that direct sunlight can boost the heat effect, the heat index may rise by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Young individuals usually face more risks than adults due to their lower sweat production. Their large skin surface area relative to their tiny bodies and high heat production from their activities adds to their risk.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. In conditions of both high temperature and humidity (a high heat index), sweating is limited and the perception of heat is enhanced. When heat uptake goes beyond the body's cooling mechanisms, there's a surge in body temperature, posing health risks.

Humidity

September and October, with an average relative humidity of 71%, are the least humid months.

Rainfall

In Ancol, in September, it is raining for 17.2 days, with typically 55mm (2.17") of accumulated precipitation. Throughout the year, there are 292.5 rainfall days, and 1468mm (57.8") of precipitation is accumulated.

Daylight

In September, the average length of the day is 12h and 4min.
On the first day of the month, sunrise is at 05:52 and sunset at 17:52. On the last day of September, in Ancol, sunrise is at 05:37 and sunset at 17:47 WIB.

Sunshine

The average sunshine in September in Ancol is 9.1h.

UV index

The months with the highest UV index in Ancol are February through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: In September, an average UV index of 7 transforms into the following instructions:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.