Jakarta
Indonesia
Long-term weather forecast
Long-term weather forecast
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September weather forecast and Climate
Jakarta, Indonesia

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The cityscape of Jakarta, Indonesia, under a dramatic evening skyline
The cityscape of Jakarta, Indonesia, under a dramatic evening skyline
September in Jakarta marks the beginning of the end of the dry season with its humidity levels dropping to 71% - probably the lowest to be experienced in the entire year.
September is the warmest month of the year with the temperatures going as high as 33°C (91.4°F) maximum and 27°C (80.6°F) at the minimum. Rainfall increases a little to rain for an average of six days during the month collecting average precipitation of 61mm (2.4").
The average monthly sunshine hours drop a few to 280 hours across the month inciting the sea to heat at a monthly average of 28°C (82.4°F).
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  • The average high temperature in September: 33°C

The warmest month (with the highest average high temperature) is September (33°C).
The month with the lowest average high temperature is January (29.9°C).

  • The average low temperature in September: 25.5°C

Months with the highest average low temperature are September and October (25.5°C).
The coldest month (with the lowest average low temperature) is January (24.2°C).

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  • The average humidity in September: 75%

Months with the highest relative humidity are January and February (85%).
The month with the lowest relative humidity is September (75%).

  • The average rainfall in September: 64mm

The wettest month (with the highest rainfall) is January (402mm).
The driest month (with the lowest rainfall) is July (58mm).

  • The average rainfall days in September: 6 days

The month with the highest number of rainy days is January (19 days).
The month with the lowest number of rainy days is August (5 days).

  • The average sea temperature in September: 29°C

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

  • The average daylight in September: 12h

Months with the longest days are January, February, March, April, May, June, July, August, September, October, November and December (Average daylight: 12h).
Months with shortest days are January, February, March, April, May, June, July, August, September, October, November and December (Average daylight: 12h).

  • The average sunshine in September: 9.7h

The month with most sunshine is September (Average sunshine: 9.7h).
The month with least sunshine is January (Average sunshine: 6.1h).

  • The average UV index in September: 12

Months with the highest UV index are January, February, March, April, August, September, October, November and December (UV index 12).
Months with the lowest UV index are June and July (UV index 10).

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