September weather forecast
Jakarta, Indonesia

The cityscape of Jakarta, Indonesia, under a dramatic evening skyline
The cityscape of Jakarta, Indonesia, under a dramatic evening skyline

Weather in September

The first month of the spring, September, is also a hot month in Jakarta, Indonesia, with temperature in the range of an average low of 25°C (77°F) and an average high of 31.2°C (88.2°F).

Temperature

In Jakarta, the average high-temperature in September is practically the same as in August - a still hot 31.2°C (88.2°F). In September, in Jakarta, Indonesia, the average low-temperature is 25°C (77°F).

Heat index

The average heat index in September is estimated at a sweltering 37.5°C (99.5°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'felt air temperature', 'feels like', or 'apparent temperature', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. This effect is individual, with diverse people perceiving weather differently for numerous reasons (wind, clothing, metabolic differences), and activity. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

In Jakarta, the average relative humidity in September is 68%.

Rainfall

In Jakarta, during September, the rain falls for 13.5 days and regularly aggregates up to 46mm (1.81") of precipitation. Throughout the year, there are 252 rainfall days, and 1150mm (45.28") of precipitation is accumulated.

Sea temperature

In September, the average sea temperature is 29°C (84.2°F).
Note: Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

The average length of the day in September in Jakarta is 12h and 4min.
On the first day of the month, sunrise is at 05:52 and sunset at 17:52. On the last day of September, sunrise is at 05:38 and sunset at 17:47 WIB.

Sunshine

In Jakarta, the average sunshine in September is 9.6h.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index in Jakarta. 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 vulnerability from exposure to the Sun's UV rays for average individuals.
Note: In September, the average maximum UV index of 7 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
[Resources]

FAQ

What is the temperature in September in Jakarta?

The average high-temperature, in September, in Jakarta, Indonesia, is 31.2°C (88.2°F), while the average low-temperature is 25°C (77°F). The average heat index (a.k.a. 'apparent temperature', 'feels like'), which factors the actual air temperature with the relative humidity, in September is estimated at 37.5°C (99.5°F).

What is the average humidity in September in Jakarta?

In Jakarta, Indonesia, the average relative humidity in September is 68%.

How much does it rain in Jakarta in September?

In September, in Jakarta, the rain falls for 13.5 days. Throughout September, 46mm (1.81") of precipitation is accumulated.

What is the sea water temperature in September in Jakarta?

In Jakarta, Indonesia, in September, the average water temperature is 29°C (84.2°F). For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

How many hours of daylight does Jakarta have in September?

In Jakarta, Indonesia, the average day length in September is 12h and 4min.

When are sunrise and sunset in September in Jakarta?

On the first day of September in Jakarta, Indonesia, sunrise is at 05:52 and sunset at 17:52. On the last day of the month, sunrise is at 05:38 and sunset at 17:47 WIB.

How many hours of sunshine does Jakarta have in September?

In Jakarta, the average sunshine duration in September is 9.6h.

What is the month with the highest UV index in Jakarta?

January through December, with an average maximum UV index of 7, are months with the highest UV index.

What are the months with the lowest UV index in Jakarta?

January through December, with an average maximum UV index of 7, are months with the lowest UV index in Jakarta, Indonesia.

How high is the UV index in September in Jakarta?

In September, the average daily maximum UV index in Jakarta, Indonesia, is 7. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation.

Average temperature in September
Jakarta, Indonesia

Average temperature in September - Jakarta, Indonesia
  • Average high temperature in September: 31.2°C

The warmest month (with the highest average high temperature) is October (31.8°C).
The months with the lowest average high temperature are January and February (29.8°C).

  • Average low temperature in September: 25°C

The month with the highest average low temperature is November (26.5°C).
The coldest month (with the lowest average low temperature) is August (24.7°C).

[Resources]

Average pressure in September
Jakarta, Indonesia

Average pressure in September - Jakarta, 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 (1009.2mbar).

[Resources]

Average wind speed in September
Jakarta, Indonesia

Average wind speed in September - Jakarta, Indonesia
  • Average wind speed in September: 8.8km/h

The windiest month (with the highest average wind speed) is January (12.4km/h).
The calmest month (with the lowest average wind speed) is November (8.1km/h).

[Resources]

Average humidity in September
Jakarta, Indonesia

Average humidity in September - Jakarta, Indonesia
  • Average humidity in September: 68%

The month with the highest relative humidity is February (76%).
The month with the lowest relative humidity is October (67%).

[Resources]

Average rainfall in September
Jakarta, Indonesia

Average rainfall in September - Jakarta, Indonesia
  • Average rainfall in September: 46mm

The wettest month (with the highest rainfall) is March (144mm).
The driest month (with the least rainfall) is August (35mm).

[Resources]

Average rainfall days in September
Jakarta, Indonesia

Average rainfall days in September - Jakarta, Indonesia
  • Average rainfall days in September: 13.5 days

The month with the highest number of rainy days is March (26.1 days).
The month with the least rainy days is August (11.6 days).

[Resources]

Average sea temperature in September
Jakarta, Indonesia

Average sea temperature in September - Jakarta, Indonesia
  • Average sea temperature in September: 29°C

The best months for swimming (with the highest average sea temperature) are April and May (30°C).
The coldest months (with the lowest average sea temperature) are January and February (28°C).

[Resources]

Average daylight in September /
Average sunshine in September
Jakarta, Indonesia

Average daylight in September / Average sunshine in September - Jakarta, Indonesia
  • Average daylight in September: 12h and 4min

The month with the longest days is December (Average daylight: 12h and 29min).
The month with the shortest days is June (Average daylight: 11h and 46min).

  • Average sunshine in September: 9.6h

The month with the most sunshine is March (Average sunshine: 10.2h).
The month with the least sunshine is July (Average sunshine: 7.3h).

[Resources]

Average sunshine days in September
Jakarta, Indonesia

Average sunshine days in September - Jakarta, Indonesia
  • Average sunshine days in September: 14.5 days

The month with the most sunshine days is August (16 days).
The month with the least sunshine days is February (2.6 days).

[Resources]

Average UV index in September
Jakarta, Indonesia

Average UV index in September - Jakarta, 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).

[Resources]

Average cloud cover in September
Jakarta, Indonesia

Average cloud cover in September - Jakarta, Indonesia
  • Average cloud cover in September: 22

The month with the most cloud cover is January (Cloud cover 46).
The month with the least cloud cover is August (Cloud cover 21).

[Resources]

Average visibility in September
Jakarta, Indonesia

Average visibility in September - Jakarta, 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).

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location