September weather forecast
Batam, Indonesia

The weather in September in Batam navigates a significant turn, bringing about the driest conditions of the entire year. With mild temperature fluctuation and unchanged humidity, Batam continues to maintain its warm, tropical climate. A substantial decrease lowers the rainfall promptly to 58mm (2.28"), positioning September as a noticeably dry month. With this reduced rainfall, the city enjoys enhanced luminosity courtesy of longer sunshine hours. However, the start of October initiates an increase in rainfall consistent with Batam's return to typical high rainfall levels.

Temperature

The average high-temperature in September in Batam, at a still hot 30.4°C (86.7°F), reveals a modest deviation from August's 30.2°C (86.4°F). Batam sustains a near constant temperature throughout September, with nighttime averages of 26.5°C (79.7°F).

Heat index

For most parts of September, the heat index is evaluated at a sweltering 37°C (98.6°F). Undertake extra safety actions, heat cramps and heat exhaustion are expected. Heatstroke may result from lengthy activity.
The standards for the heat index are set for locations in shade and under light breezes. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', gives a temperature feeling by integrating air temperature and humidity. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. Keep it in mind, direct sunlight can augment the heat you experience, possibly pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Youngsters frequently overlook the need for breaks and fluid intake. Thirst is an advanced sign of dehydration - thereby highlighting the importance of keeping hydrated, particularly during long physical activities.
When temperatures rise, the human body turns to perspiration, using the cooling power of evaporating sweat. In high relative humidity, the body's ability to evaporate heat is diminished, resulting in a heightened feeling of warmth. Heat-related challenges, like dehydration, can be anticipated when body heat isn't managed effectively.

Humidity

The average relative humidity in September in Batam is 73%.

Rainfall

September is the month with the least rainfall in Batam, Indonesia. Rain falls for 20 days and accumulates 58mm (2.28") of precipitation.

Daylight

In Batam, the average length of the day in September is 12h and 7min.
On the first day of the month, sunrise is at 05:59 and sunset at 18:07. On the last day of September, in Batam, sunrise is at 05:50 and sunset at 17:56 WIB.

Sunshine

The average sunshine in September is 10.2h.

UV index

The months with the highest UV index are January through December, with an average maximum UV index of 7. The months with the lowest UV index in Batam 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 exposure to the Sun's UV radiation for average individuals.
Note: A typical high UV index of 7 in September suggests the following recommendations:
Exercise precautions and adapt sun safety practices. Defence against skin and eye affliction is paramount. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete 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.