September weather forecastMerak, Indonesia

Weather in September

The first month of the spring, September, is still a hot month in Merak, Indonesia, with temperature in the range of an average high of 30.8°C (87.4°F) and an average low of 25°C (77°F).

Temperature

Merak's shift into September sets the average high-temperature at a still hot 30.8°C (87.4°F), a figure that deviates only slightly from August's 30.3°C (86.5°F). The low-temperature average for Merak during September stands at a warm 25°C (77°F).

Heat index

In September, the average heat index is evaluated at a fiery hot 37°C (98.6°F). Exercise special caution, heat exhaustion and heat cramps are probable. Prolonged activity may induce heatstroke.
Bear in mind that the heat index values are determined for shaded areas and light breezes. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', gives an indication of how one might feel in terms of heat after considering humidity. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. When in direct sunlight, one should be cautious as it can raise the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Young ones are generally at greater risk than adults due to their limited sweating ability. In addition, their large skin surface relative to their small bodies and higher heat production from their activities add to their vulnerability.
Perspiration and the resultant sweat evaporation are the body's natural thermostat, helping regulate temperature. With higher relative humidity, the rate of evaporation is reduced, resulting in increased heat retention in the body compared to drier air. If heat absorption isn't effectively countered by the body's cooling methods, body temperature surges, hinting at potential problems.

Humidity

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

Rainfall

In Merak, during September, the rain falls for 9.6 days and regularly aggregates up to 26mm (1.02") of precipitation. Throughout the year, in Merak, there are 243.3 rainfall days, and 1085mm (42.72") of precipitation is accumulated.

Daylight

The average length of the day in September is 12h and 5min.
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 05:41 and sunset at 17:50 WIB.

Sunshine

With an average of 9.3h of sunshine, September has the most sunshine of the year.

UV index

The months with the highest UV index 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 rays for average individuals.
Note: The daily maximum UV index of 7 in September interprets into the following advice:
Sidestep overexposure. Individuals with fair complexions risk burning in fewer than 20 minutes. Between 10 a.m. and 4 p.m., UV radiation is strongest. Make an effort to avoid direct sunlight during this time, remembering that shade structures may not provide full sun protection. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.