September weather forecastBontang, Indonesia
September
Weather in September
September, the first month of the autumn in Bontang, is still a tropical month, with temperature in the range of an average low of 24.8°C (76.6°F) and an average high of 30.7°C (87.3°F).Temperature
September experiences an average high-temperature of a still hot 30.7°C (87.3°F), barely different from August's 30.4°C (86.7°F). During the nights in September, the temperature averages to a moderately hot 24.8°C (76.6°F).Heat index
September's average heat index is calculated to be a fiery hot 39°C (102.2°F). Ensure extra safety measures, heat exhaustion and heat cramps are likely. Continuous activity might result in heatstroke.In the scope of the heat index, its values resonate with shade and light wind conditions. The heat index may experience an enhancement of 15 Fahrenheit (8 Celsius) degrees under direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. The individual's temperature perception can be influenced by numerous factors such as metabolic variations, physical activity, and clothing. Remember, direct sunlight exposure can heighten the heat impact and might increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children regularly disregard the necessity to rest and replenish fluids. Thirst is a late symptom of dehydration - thus, maintaining hydration, particularly during long-lasting physical activities, is essential.
As a reaction to high temperatures, the human body begins to perspire, using the evaporation of sweat to lower its temperature. When the air holds a significant amount of moisture, the efficiency of the evaporation process is decreased, preventing the body from cooling down efficiently, leading to the sensation of overheating. Rising body temperatures due to excess heat retention could signify impending heat disorders.
Humidity
The average relative humidity in September is 77%.Rainfall
September is the month with the least rainfall. Rain falls for 18.2 days and accumulates 53mm (2.09") of precipitation.Sea temperature
In September, the average sea temperature is 28.8°C (83.8°F).Note: Swimming, diving, and other water-related activities in temperatures between 25°C (77°F) and 29°C (84.2°F) are considered highly enjoyable and satisfying for longer durations without uneasiness.
Daylight
In September, the average length of the day is 12h and 7min.On the first day of the month, sunrise is at 06:06 and sunset at 18:13. On the last day of September, sunrise is at 05:56 and sunset at 18:03 WITA.
Sunshine
The month with the most sunshine is September, with an average of 9.5h of sunshine.UV index
The months with the highest UV index in Bontang 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 estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: A maximum daily UV index of 7 during September morphs into the following directions:
Eschew overexposure. Those with light skin may suffer burns in fewer than 20 minutes. Stay in the shade and limit direct sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its strongest. Remember, however, that not all shade structures provide full sun protection. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Attention! The combination of sand and water reflections enhances UV ray intensity.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Bontang, Indonesia
- Average high temperature in September: 30.7°C
The warmest month (with the highest average high temperature) is October (31.1°C).
The month with the lowest average high temperature is January (29.8°C).
- Average low temperature in September: 24.8°C
The month with the highest average low temperature is May (25.7°C).
The coldest months (with the lowest average low temperature) are August and September (24.8°C).
Average pressure in September
Bontang, Indonesia
- Average pressure in September: 1009.7mbar
The month with the highest atmospheric pressure is September (1009.7mbar).
The months with the lowest atmospheric pressure are November and December (1008.4mbar).
Average wind speed in September
Bontang, Indonesia
- Average wind speed in September: 9.6km/h
The windiest month (with the highest average wind speed) is August (10.2km/h).
The calmest months (with the lowest average wind speed) are May and November (7.6km/h).
Average humidity in September
Bontang, Indonesia
- Average humidity in September: 77%
The months with the highest relative humidity are January and December (80%).
The month with the lowest relative humidity is October (76%).
Average rainfall in September
Bontang, Indonesia
- Average rainfall in September: 53mm
The wettest month (with the highest rainfall) is December (129mm).
The driest month (with the least rainfall) is September (53mm).
Average rainfall days in September
Bontang, Indonesia
- Average rainfall days in September: 18.2 days
The month with the highest number of rainy days is January (25.3 days).
The month with the least rainy days is September (18.2 days).
Average sea temperature in September
Bontang, Indonesia
- Average sea temperature in September: 28.8°C
The best month for swimming (with the highest average sea temperature) is May (29.8°C).
The coldest month (with the lowest average sea temperature) is February (28.4°C).
Average daylight in September /
Average sunshine in September
Bontang, Indonesia
- Average daylight in September: 12h and 6min
The month with the longest days is June (Average daylight: 12h and 6min).
The month with the shortest days is October (Average daylight: 12h and 6min).
- Average sunshine in September: 9h and 30min
The month with the most sunshine is September (Average sunshine: 9h and 30min).
The month with the least sunshine is January (Average sunshine: 7h and 48min).
Average sunshine days in September
Bontang, Indonesia
- Average sunshine days in September: 9.2 days
The month with the most sunshine days is September (9.2 days).
The month with the least sunshine days is January (4.8 days).
Average UV index in September
Bontang, Indonesia
- Average UV index in September: 7
The months with the highest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).
The months with the lowest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).
Average cloud cover in September
Bontang, Indonesia
- Average cloud cover in September: 33
The month with the most cloud cover is January (Cloud cover 47).
The month with the least cloud cover is September (Cloud cover 33).
Average visibility in September
Bontang, Indonesia
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
