September weather forecast
Merdeka, Indonesia

The first month of the autumn, September, is also a hot month in Merdeka, Indonesia, with an average temperature ranging between max 32.6°C (90.7°F) and min 23.4°C (74.1°F).

Temperature

The dawn of September sees an average high-temperature of a still tropical 32.6°C (90.7°F), subtly contrasting with August's 33.1°C (91.6°F). In Merdeka, the expected average low-temperature for September is a warm 23.4°C (74.1°F).

Heat index

Throughout September, the heat index is computed to be a burning hot 45°C (113°F). Warning: Heat cramps and heat exhaustion are anticipated. Heatstroke is a risk with ongoing activity.
One should be cognizant that the heat index values are tailored for shaded spots and mild winds. A direct sunlight exposure may boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', stands as a testimony to how temperature and humidity combine to impact our sense of warmth. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. Consider the sun's direct rays and their impact; they can potentially increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Young ones generally face higher dangers than adults since they sweat less. Along with their large skin surface area compared totheir small bodies and increased heat production from their activities, the risks are heightened.
Perspiration, followed by sweat evaporation, is the human body's chief method to maintain a balanced temperature. 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 the heat gained surpasses the body's cooling capacity, temperatures rise, signaling potential health concerns.

Humidity

The average relative humidity in September is 77%.

Rainfall

In Merdeka, in September, it is raining for 26.7 days, with typically 105mm (4.13") of accumulated precipitation. Throughout the year, there are 298 rainfall days, and 1172mm (46.14") of precipitation is accumulated.

Daylight

In September, the average length of the day is 12h and 8min.
On the first day of the month, sunrise is at 06:20 and sunset at 18:31. On the last day of September, sunrise is at 06:13 and sunset at 18:18 WIB.

Sunshine

The average sunshine in September is 8.8h.

UV index

The months with the highest UV index in Merdeka are January through December, with an average maximum UV index of 7. The months with the lowest UV index are January through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for average individuals.
Note: An average maximum UV index of 7 in September leads to these recommendations:
Ward off overexposure. Defence against solar harm is crucial. 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.