September weather forecastSibolga, Indonesia
September
Weather in September
Weather patterns of September in Sibolga, Indonesia, reflect those of the preceding summer months. Although there is a slight increase in rainfall to 118mm (4.65"), the city continues to bask in sunshine. The month witnesses minor changes in weather with a hint of varied climatic dynamics. Agricultural activities in the region benefit from the equitable weather conditions. As September concludes, it prepares the ground for the later, rainier months.Temperature
Transitioning into September, Sibolga records an average high-temperature of a still moderately hot 28°C (82.4°F), almost identical to August's 28.6°C (83.5°F). The average temperature during September nights dips to a pleasant 21.5°C (70.7°F).Heat index
For September, the heat index is calculated to be a tropical 32°C (89.6°F). One might feel worn out with persistent exposure and activity, resulting in heat cramps.Know that the heat index computations account for shaded terrains and slight winds. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is an indicator that blends the effects of temperature and humidity to depict perceived warmth. The effect is personal, with varied weather perceptions among individuals due to differences in body mass, stature, and physical activity. 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 hold particular significance for children. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
Humidity
The average relative humidity in September is 80%.Rainfall
In Sibolga, Indonesia, in September, it is raining for 22.5 days, with typically 118mm (4.65") of accumulated precipitation. Throughout the year, there are 285.3 rainfall days, and 1792mm (70.55") of precipitation is accumulated.Sea temperature
September and November, with an average sea temperature of 29.2°C (84.6°F), are months with the coldest seawater.Note: Water temperatures between 25°C (77°F) and 29°C (84.2°F) are ideal for all water activities, offering enjoyment without causing discomfort over extended periods.
Daylight
In September, the average length of the day is 12h and 7min.On the first day of September, sunrise is at 06:20 and sunset at 18:29. On the last day of the month, sunrise is at 06:11 and sunset at 18:17 WIB.
Sunshine
In Sibolga, Indonesia, the average sunshine in September is 8.3h.UV index
January through December, with an average maximum UV index of 6, are months with the highest UV index in Sibolga, Indonesia. The months with the lowest UV index are January through December, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for the average person.Note: A typical high UV index of 6 in September suggests the following recommendations:
Stick with precautions and abide by sun safety procedures. Evading sunburn is essential. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. Always opt for UVA and UVB-resistant sunglasses on radiant days. Caution! The Sun's UV intensity grows with reflections off sand and water.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Sibolga, Indonesia
- Average high temperature in September: 28°C
The warmest month (with the highest average high temperature) is May (28.9°C).
The month with the lowest average high temperature is November (27.3°C).
- Average low temperature in September: 21.5°C
The month with the highest average low temperature is May (22.5°C).
The coldest months (with the lowest average low temperature) are July and September (21.5°C).
Average pressure in September
Sibolga, Indonesia
- Average pressure in September: 1011mbar
The month with the highest atmospheric pressure is September (1011mbar).
The month with the lowest atmospheric pressure is May (1009.9mbar).
Average wind speed in September
Sibolga, Indonesia
- Average wind speed in September: 5.3km/h
The windiest month (with the highest average wind speed) is June (5.6km/h).
The calmest month (with the lowest average wind speed) is April (4.7km/h).
Average humidity in September
Sibolga, Indonesia
- Average humidity in September: 80%
The month with the highest relative humidity is November (84%).
The months with the lowest relative humidity are June and July (78%).
Average rainfall in September
Sibolga, Indonesia
- Average rainfall in September: 118mm
The wettest month (with the highest rainfall) is November (259mm).
The driest month (with the least rainfall) is June (82mm).
Average rainfall days in September
Sibolga, Indonesia
- Average rainfall days in September: 22.5 days
The months with the highest number of rainy days are March and November (27.2 days).
The month with the least rainy days is June (17.2 days).
Average sea temperature in September
Sibolga, Indonesia
- Average sea temperature in September: 29.2°C
The best months for swimming (with the highest average sea temperature) are April, June and July (29.9°C).
The coldest months (with the lowest average sea temperature) are September and November (29.2°C).
Average daylight in September /
Average sunshine in September
Sibolga, Indonesia
- Average daylight in September: 12h and 6min
The month with the longest days is June (Average daylight: 12h and 12min).
The month with the shortest days is December (Average daylight: 12h and 0min).
- Average sunshine in September: 8h and 18min
The month with the most sunshine is June (Average sunshine: 9h and 0min).
The month with the least sunshine is November (Average sunshine: 7h and 0min).
Average sunshine days in September
Sibolga, Indonesia
- Average sunshine days in September: 5.1 days
The month with the most sunshine days is June (11.4 days).
The month with the least sunshine days is November (1.8 days).
Average UV index in September
Sibolga, Indonesia
- Average UV index in September: 6
The months with the highest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 6).
The months with the lowest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 6).
Average cloud cover in September
Sibolga, Indonesia
- Average cloud cover in September: 41
The month with the most cloud cover is November (Cloud cover 55).
The month with the least cloud cover is June (Cloud cover 33).
Average visibility in September
Sibolga, Indonesia
- Average visibility in September: 10km
The months with the highest visibility are May, June, July, August and September (10km).
The months with the lowest visibility are January, February, March, April, October, November and December (9km).
