September weather forecastCilegon, Indonesia
September
Weather in September
September, the first month of the spring in Cilegon, is still a hot month, with temperature in the range of an average high of 31.8°C (89.2°F) and an average low of 23.7°C (74.7°F).Temperature
September experiences an average high-temperature of a still tropical 31.8°C (89.2°F), barely different from August's 31.3°C (88.3°F). The temperature dips to an average of 23.7°C (74.7°F) during September nights.Heat index
September's heat index is appraised at a blistering 40°C (104°F). Incorporate additional safety actions, heat cramps and heat exhaustion are possible. Long-term activity may induce heatstroke.Understand that the heat index values take into account shaded locations and mild winds. Direct sunshine exposure could raise heat index values by as much as 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', is the outcome of merging air's temperature and its humidity metrics. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Young kids are often more at risk than adults as they tend to perspire less. Besides, their skin surface is larger relative to their small bodies, and their increased heat output from their active lifestyle compounds their risk.
The innate cooling system of the human body revolves around perspiration, with the evaporation of sweat being central to this process. In circumstances of high air temperature and humidity (high heat index), the body's perspiration is restricted, heightening the feeling of warmth. As body temperatures escalate without effective heat release, one might face dehydration threats.
Humidity
The months with the lowest humidity are September and October, with an average relative humidity of 71%.Rainfall
In Cilegon, in September, during 17.2 rainfall days, 55mm (2.17") of precipitation is typically accumulated. Throughout the year, there are 292.5 rainfall days, and 1468mm (57.8") of precipitation is accumulated.Daylight
In September, the average length of the day is 12h and 4min.On the first day of September, sunrise is at 05:55 and sunset at 17:55. On the last day of the month, sunrise is at 05:41 and sunset at 17:50 WIB.
Sunshine
In Cilegon, the average sunshine in September is 9.1h.UV index
February through December, with an average maximum UV index of 7, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: A daily high UV index of 7 in September leads to these guidelines:
Follow precautions and abide by sun safety rules. Deterrence of sunburn is imperative. The Sun's UV radiation is at its strongest between the hours of 10 a.m. and 4 p.m. Minimize direct exposure to the sun during this period. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Cilegon, Indonesia
- Average high temperature in September: 31.8°C
The warmest month (with the highest average high temperature) is October (32.2°C).
The month with the lowest average high temperature is January (29.8°C).
- Average low temperature in September: 23.7°C
The month with the highest average low temperature is May (24.8°C).
The coldest month (with the lowest average low temperature) is August (23.1°C).
Average pressure in September
Cilegon, Indonesia
- Average pressure in September: 1011.1mbar
The month with the highest atmospheric pressure is September (1011.1mbar).
The month with the lowest atmospheric pressure is December (1009.3mbar).
Average wind speed in September
Cilegon, Indonesia
- Average wind speed in September: 5.2km/h
The windiest month (with the highest average wind speed) is January (9.4km/h).
The calmest month (with the lowest average wind speed) is August (5km/h).
Average humidity in September
Cilegon, Indonesia
- Average humidity in September: 71%
The months with the highest relative humidity are February and March (80%).
The months with the lowest relative humidity are September and October (71%).
Average rainfall in September
Cilegon, Indonesia
- Average rainfall in September: 55mm
The wettest month (with the highest rainfall) is March (189mm).
The driest month (with the least rainfall) is August (45mm).
Average rainfall days in September
Cilegon, Indonesia
- Average rainfall days in September: 17.2 days
The month with the highest number of rainy days is January (29.4 days).
The month with the least rainy days is August (14.3 days).
Average daylight in September /
Average sunshine in September
Cilegon, Indonesia
- Average daylight in September: 12h and 6min
The month with the longest days is December (Average daylight: 12h and 30min).
The month with the shortest days is June (Average daylight: 11h and 48min).
- Average sunshine in September: 9h and 6min
The month with the most sunshine is December (Average sunshine: 9h and 12min).
The months with the least sunshine are June and July (Average sunshine: 7h and 0min).
Average sunshine days in September
Cilegon, Indonesia
- Average sunshine days in September: 9.9 days
The month with the most sunshine days is August (14 days).
The month with the least sunshine days is February (0.7 days).
Average UV index in September
Cilegon, Indonesia
- Average UV index in September: 7
The months with the highest UV index are February, March, April, May, June, July, August, September, October, November and December (UV index 7).
The month with the lowest UV index is January (UV index 6).
Average cloud cover in September
Cilegon, Indonesia
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in September
Cilegon, Indonesia
- Average visibility in September: 10km
The months with the highest visibility are May, June, July, August, September and October (10km).
The months with the lowest visibility are January, February, March, April, November and December (9km).
