September weather forecastSiantan, Indonesia
September
Weather in September
September, the first month of the autumn in Siantan, is still a tropical month, with an average temperature ranging between max 32.3°C (90.1°F) and min 23.8°C (74.8°F).Temperature
As Siantan welcomes September, the average high-temperature records at a still hot 32.3°C (90.1°F), marking an insignificant deviation from the prior month. Throughout September, Siantan encounters an average temperature drop to a warm 23.8°C (74.8°F).Heat index
For most parts of September, the heat index is calculated to be a burning hot 45°C (113°F). Stay watchful: Heat exhaustion along with heat cramps are likely. Ongoing effort may cause heatstroke.Given the heat index, its values are aligned with shaded sites and gentle winds. Exposure to unobstructed sunshine could lead to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is an indicator that blends the effects of temperature and humidity to depict perceived warmth. Additional factors encompassing metabolic differences, the level of physical activity, and clothing can impact the individual's perception of temperature. Considering the impact of direct sunlight, it's possible for the heat index to surge by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Kids frequently fail to realize the necessity for resting and hydrating. Thirst is an advanced indication of dehydration - hence, maintaining hydration, especially during extended physical activities, becomes essential.
By perspiring, the human body can shed its excessive warmth since evaporated sweat cools it off. When there is an excess of moisture in the atmosphere, the efficiency of the evaporation process is lessened, leading to less efficient body cooling and a sensation of overheating. When the heat gained surpasses the body's cooling capacity, temperatures rise, signaling potential health concerns.
Humidity
With an average relative humidity of 79%, September is the least humid month.Rainfall
In September, the rain falls for 19.5 days. Throughout September, 75mm (2.95") of precipitation is accumulated. In Siantan, during the entire year, the rain falls for 282.2 days and collects up to 1495mm (58.86") of precipitation.Daylight
In Siantan, the average length of the day in September is 12h and 7min.On the first day of September, sunrise is at 05:39 and sunset at 17:46. On the last day of the month, sunrise is at 05:29 and sunset at 17:36 WIB.
Sunshine
With an average of 8.6h 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. The months with the lowest UV index are January through December, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for average individuals.Note: A maximum daily UV index of 7 during September morphs into the following directions:
Adhere to precautions and respect sun safety doctrines. Avoiding sunburn is vital. Avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is most intense, and remember that not all shade structures provide full protection. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Siantan, Indonesia
- Average high temperature in September: 32.3°C
The warmest month (with the highest average high temperature) is August (32.5°C).
The month with the lowest average high temperature is January (30.6°C).
- Average low temperature in September: 23.8°C
The months with the highest average low temperature are May and October (24.3°C).
The coldest month (with the lowest average low temperature) is February (23.3°C).
Average pressure in September
Siantan, Indonesia
- Average pressure in September: 1009.8mbar
The months with the highest atmospheric pressure are February and March (1009.9mbar).
The month with the lowest atmospheric pressure is November (1008.9mbar).
Average wind speed in September
Siantan, Indonesia
- Average wind speed in September: 5.9km/h
The windiest month (with the highest average wind speed) is January (6.3km/h).
The calmest month (with the lowest average wind speed) is April (4.4km/h).
Average humidity in September
Siantan, Indonesia
- Average humidity in September: 79%
The month with the highest relative humidity is February (85%).
The month with the lowest relative humidity is September (79%).
Average rainfall in September
Siantan, Indonesia
- Average rainfall in September: 75mm
The wettest month (with the highest rainfall) is February (161mm).
The driest month (with the least rainfall) is August (74mm).
Average rainfall days in September
Siantan, Indonesia
- Average rainfall days in September: 19.5 days
The month with the highest number of rainy days is April (26.6 days).
The month with the least rainy days is July (18.7 days).
Average daylight in September /
Average sunshine in September
Siantan, 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: 8h and 36min
The month with the most sunshine is September (Average sunshine: 8h and 36min).
The month with the least sunshine is December (Average sunshine: 7h and 0min).
Average sunshine days in September
Siantan, Indonesia
- Average sunshine days in September: 8.8 days
The months with the most sunshine days are July and August (10.2 days).
The month with the least sunshine days is April (2.3 days).
Average UV index in September
Siantan, 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
Siantan, Indonesia
- Average cloud cover in September: 37
The month with the most cloud cover is December (Cloud cover 52).
The months with the least cloud cover are August and September (Cloud cover 37).
Average visibility in September
Siantan, Indonesia
- Average visibility in September: 9km
The months with the highest visibility are May, June, July, August, September, October and November (9km).
The months with the lowest visibility are January, February, March, April and December (8km).
