September weather forecast
Koja, Indonesia

The first month of the spring, September, is also a hot month in Koja, Indonesia, with temperature in the range of an average low of 25.2°C (77.4°F) and an average high of 31.1°C (88°F).

Temperature

The shift into September finds Koja at an average high-temperature of a still hot 31.1°C (88°F), closely comparable to August's conditions. During September, the average low-temperature is recorded at a moderately hot 25.2°C (77.4°F).

Heat index

The average heat index in September is calculated to be a very hot 37°C (98.6°F). Undertake extra safety actions, heat cramps and heat exhaustion are expected. Heatstroke may result from lengthy activity.
Heat index values are typically calculated for conditions of shade and a light breeze. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is the result of factoring in humidity to the air temperature, indicating perceived warmth. The individual's experience of temperature can be shaped by numerous aspects such as metabolic variations, physical exertion, and attire. Being aware that direct sunlight can impact the felt heat might mean an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Juveniles are regularly less conscious of the need to recuperate and rehydrate. Thirst is a tardy symptom of dehydration - hydration, especially during lengthy physical activities, should be maintained.
Perspiration, which is the evaporation of sweat, is a primary way the human body manages and dispels excessive warmth. Heightened relative humidity interferes with the body's usual cooling mechanism by reducing evaporation, subsequently decreasing the body's cooling rate and increasing the sensation of heat. The body is at risk of dehydration and related complications when it fails to shed excessive heat.

Humidity

In Koja, the average relative humidity in September is 68%.

Rainfall

In Koja, in September, during 11.8 rainfall days, 46mm (1.81") of precipitation is typically accumulated. Throughout the year, in Koja, Indonesia, there are 264.8 rainfall days, and 1580mm (62.2") of precipitation is accumulated.

Daylight

In September, the average length of the day in Koja is 12h and 4min.
On the first day of September, sunrise is at 05:52 and sunset at 17:52. On the last day of the month, sunrise is at 05:37 and sunset at 17:46 WIB.

Sunshine

In September, the average sunshine in Koja is 9.6h.

UV index

The months with the highest UV index in Koja are January through December, with an average maximum UV index of 7. January through December, with an average maximum UV index of 7, are months with the lowest UV index. A UV Index of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: In September, the maximum UV index of 7 suggests this advice:
Skirt overexposure. People with light complexions might get scorched in under 20 minutes. Stay in the shade and limit direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is particularly strong. Remember, however, that shade structures may not provide complete protection. Always opt for UVA and UVB-resistant sunglasses on radiant days.