September weather forecast
Serang, Indonesia

With September, the dry spell fades and Serang’s rainy season re-emerges. Rainfall measures an average of 27mm (1.06"), marking the city’s transition into its wetter season. Despite the increase in rain, the city's temperatures and humidity levels remain steady, providing a familiar ambiance. Come October, the city’s precipitation levels climb further, ushering in heavier rainfall.

Temperature

A minor adjustment in Serang's average high-temperature is noted with the start of September, touching a still hot 31.2°C (88.2°F) from August's 30.7°C (87.3°F). An average nighttime temperature of 24.9°C (76.8°F) is recorded in Serang, Indonesia, during September.

Heat index

The heat index value during September is evaluated at a very hot 38°C (100.4°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Understanding the heat index involves considering values for shaded locales with light wind. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is an indicator that blends the effects of temperature and humidity to depict perceived warmth. Additional factors encompassing metabolic differences, the level of physical activity, and clothing can impact the individual's perception of temperature. One must note that being under the direct sun can escalate the heat's effects, with the heat index possibly rising by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Young children are more at risk than adults since they tend to sweat less. Moreover, their large skin surface in proportion to their small bodies and the high heat production due to their activities contribute to their vulnerability.
One of the main methods the human body employs to cool down is by perspiring, as this process allows sweat to evaporate and remove excess heat. Increased relative humidity interferes with body cooling by slowing the rate of evaporation, resulting in a slower body cooling rate and a heightened feeling of heat. As the body gains more heat than it can dissipate, there's a risk of increasing temperatures and resultant overheating.

Humidity

The months with the lowest humidity in Serang, Indonesia, are September and October, with an average relative humidity of 71%.

Rainfall

September is the month with the least rainfall in Serang. Rain falls for 11.9 days and accumulates 27mm (1.06") of precipitation.

Daylight

The average length of the day in September is 12h and 4min.
On the first day of the month, sunrise is at 05:55 and sunset at 17:55. On the last day of September, sunrise is at 05:40 and sunset at 17:49 WIB.

Sunshine

With an average of 9.4h of sunshine, September has the most sunshine of the year.

UV index

The months with the highest UV index in Serang 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 in Serang. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: In September, the maximum UV index of 7 suggests this advice:
Persist with safeguards and heed sun safety doctrines. Keeping sunburn at bay is of prime importance. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.