September weather forecast
Batu, Indonesia

September, the first month of the spring in Batu, is also a hot month, with an average temperature varying between 32.9°C (91.2°F) and 22.1°C (71.8°F).

Temperature

With the start of September, Batu measures an average high-temperature of a still hot 32.9°C (91.2°F), not significantly differing from August's 31.3°C (88.3°F). During the nights in September, Batu observes an average low-temperature of 22.1°C (71.8°F).

Heat index

September's heat index is appraised at a blisteringly hot 42°C (107.6°F). Exercise more precautions, heat cramps and heat exhaustion are potential risks. Continuous activity could precipitate heatstroke.
It is noted that heat index values are ascertained for locations in the shade and with gentle breezes. Being exposed to direct sunshine might trigger a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is the outcome of merging air's temperature and its humidity metrics. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. By being directly under the sun, it's possible for the felt temperature to increase by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. In general, children are more at risk than adults because they sweat less. Furthermore, the large skin surface compared to their small bodies and the high heat production due to their actions contribute to this vulnerability.
The body's natural response to excessive warmth is perspiration, as it allows for cooling through sweat evaporation. In the presence of high relative humidity, the evaporation rate diminishes, resulting in the body retaining more warmth compared to dry conditions. Overheating can ensue when the body accumulates more heat than it can release, and dehydration severity may vary.

Humidity

September and October, with an average relative humidity of 67%, are the least humid months in Batu.

Rainfall

In Batu, Indonesia, in September, it is raining for 9 days, with typically 23mm (0.91") of accumulated precipitation. Throughout the year, in Batu, there are 223 rainfall days, and 1083mm (42.64") of precipitation is accumulated.

Daylight

In September, the average length of the day in Batu is 12h and 4min.
On the first day of the month, sunrise is at 05:30 and sunset at 17:28. On the last day of September, sunrise is at 05:14 and sunset at 17:24 WIB.

Sunshine

August through October, with an average of 9.5h of sunshine, are months with the most sunshine in Batu, Indonesia.

UV index

The months with the highest UV index in Batu are April, June through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily high UV index of 7 in September translates into this advice:
Use measures and accept sun safety conventions. Guarding against skin and eye trauma is of high priority. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.