September weather forecast
Cupang, Indonesia

The first month of the spring, September, is also a hot month in Cupang, Indonesia, with temperature in the range of an average low of 22.6°C (72.7°F) and an average high of 31.3°C (88.3°F).

Temperature

The unfolding of September shows an average high-temperature of a still tropical 31.3°C (88.3°F), indicating a slight variance from August's 30.5°C (86.9°F). Throughout the September nights, Cupang encounters a low-temperature of 22.6°C (72.7°F).

Heat index

In September, the heat index is estimated at a torrid 38°C (100.4°F). Exercise enhanced safety steps, heat cramps and heat exhaustion are probable. Heatstroke could be a result of sustained activity.
Heat index details are generally centered around shaded locations and a mild breeze. 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 'apparent temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. A person's impression of weather can be shaped by many aspects, among them metabolic variations, pregnancy, and levels of physical activity. It is noteworthy that being in direct sunlight can enhance the weather's impact, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Young kids are often more at risk than adults as they tend to perspire less. Besides, their skin surface is larger relative to their small bodies, and their increased heat output from their active lifestyle compounds their risk.
The physiological response of the human body to excess warmth is to perspire, thereby cooling itself through sweat evaporation. With excessive moisture in the atmosphere, the effectiveness of the evaporation process is decreased, causing the body to cool down less efficiently, leading to a sensation of overheating. When heat uptake goes beyond the body's cooling mechanisms, there's a surge in body temperature, posing health risks.

Humidity

The months with the lowest humidity in Cupang are September and October, with an average relative humidity of 69%.

Rainfall

In Cupang, during September, the rain falls for 9.5 days and regularly aggregates up to 18mm (0.71") of precipitation. Throughout the year, there are 222.3 rainfall days, and 950mm (37.4") of precipitation is accumulated.

Daylight

In Cupang, the average length of the day in September is 12h and 4min.
On the first day of the month, sunrise is at 05:46 and sunset at 17:46. On the last day of September, sunrise is at 05:31 and sunset at 17:41 WIB.

Sunshine

August and September, with an average of 9.7h of sunshine, are months with the most sunshine.

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 of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: A maximum UV index of 7 in September translates into the following recommendations:
Conform to measures and uphold sun safety traditions. Warding off skin and eye harm is necessary. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.