December weather forecast
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

Weather in December

December in Jakarta is dominantly characterized by the wet season, with substantial rainfall readings of 123mm (4.84"). This rise in rain levels from November to December ushers in a slightly cooler, yet humid weather. Throughout the month, the city experiences abundant rainfall, high humidity, and cloud coverage of 43%. Notwithstanding these conditions, the stable sea temperature of 29°C (84.2°F) and a UV index of 7 provide an inviting scenario for beach outings. With calm wind conditions averaging around 10.8km/h (6.7mph), this month holds a serene atmosphere aside from the typical intermittent rain showers.

Temperature

December's advent in Jakarta, Indonesia, notes a subtle adjustment in average high-temperature to a still hot 30.6°C (87.1°F) from November. During the December nights, Jakarta's temperature maintains an average close to the daytime highs, settling at a moderately hot 26°C (78.8°F).

Heat index

December's heat index is calculated to be a very hot 37°C (98.6°F). Implement additional safety measures to avoid heat cramps and heat exhaustion. Persistent activity might trigger heatstroke.
Note that heat index values are valued for light wind and location in the shade. With direct sunlight, the heat index could increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', combines air temperature and relative humidity to represent a human perceived temperature equivalent. The effect is experienced differently by individuals, hinging on unique characteristics such as body mass, stature, and level of activity. Keep aware, the sun, when shining directly, can intensify the heat experience, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Younglings frequently fail to recognize the requirement to rest and rehydrate. Thirst emerges late in dehydration - it is imperative to keep hydration levels high, particularly during extended physical exertions.
Perspiration and the resultant sweat evaporation are the body's natural thermostat, helping regulate temperature. Under conditions of high relative humidity, the rate of evaporation decreases. This results in the body retaining more heat than under conditions of dry air. Excessive heat that's not properly managed leads to increased body temperatures and resultant health issues.

Humidity

In Jakarta, the average relative humidity in December is 71%.

Rainfall

In Jakarta, in December, during 23.9 rainfall days, 123mm (4.84") of precipitation is typically accumulated. Throughout the year, in Jakarta, there are 252 rainfall days, and 1150mm (45.28") of precipitation is accumulated.

Sea temperature

In December, the average sea temperature is 29°C (84.2°F).
Note: For swimming, diving, and various water activities, the temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are seen as highly enjoyable and comfortable for extended durations without any discomfort.

Daylight

With an average of 12h and 30min of daylight, December has the longest days of the year.
On the first day of December, sunrise is at 05:27 and sunset at 17:55. On the last day of the month, sunrise is at 05:41 and sunset at 18:10 WIB.

Sunshine

In December, the average sunshine is 9.3h.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index in Jakarta. 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 health risk from exposure to the Sun's UV rays for the average person.
Note: In December, the maximum UV index of 7 translates into these guidelines:
Continue precautions and advocate sun safety advice. Deterrence of sunburn is indispensable. Remember that UV radiation from the Sun is strongest between 10 a.m. and 4 p.m. Make an effort to limit direct sun exposure during this time. During bright days, sunglasses that offer UVA and UVB defense are recommended. Warning! Sand and water reflections boost the intensity of UV exposure.

Frequently asked questions

How hot is it in Jakarta in December?

The high-temperature, in December, in Jakarta, is 30.6°C (87.1°F), while the low-temperature averages to 26°C (78.8°F). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which represents the influence of relative humidity on air temperature, in December is calculated to be 37°C (98.6°F).

What is the average humidity in December in Jakarta?

The average relative humidity in December in Jakarta is 71%.

How much does it rain in Jakarta in December?

In Jakarta, in December, during 23.9 rainfall days, 123mm (4.84") of precipitation is typically accumulated.

What is the sea water temperature in December in Jakarta?

In December, the average sea temperature in Jakarta is 29°C (84.2°F). 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.

When are the longest days in Jakarta?

With an average of 12h and 30min of daylight, December has the longest days of the year in Jakarta.

What is the average length of the day in December in Jakarta?

The average day length in December in Jakarta is 12h and 29min.

What time are sunrise and sunset in December in Jakarta?

On the first day of December in Jakarta, Indonesia, sunrise is at 05:27 and sunset at 17:55. On the last day of the month, sunrise is at 05:41 and sunset at 18:10 WIB.

How long on average sun shines in December in Jakarta?

In Jakarta, Indonesia, the average sunshine duration in December is 9.3h.

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 in Jakarta.

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

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

What is the UV index reading in December in Jakarta?

In Jakarta, Indonesia, the average daily maximum UV index in December is 7. A UV Index value of 6 to 7 symbolizes a high hazard to health from unsafe exposure to Sun's UV rays.

Average temperature in December
Jakarta, Indonesia

Average temperature in December - Jakarta, Indonesia
  • Average high temperature in December: 30.6°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 December: 26°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).

Average pressure in December
Jakarta, Indonesia

Average pressure in December - Jakarta, Indonesia
  • Average pressure in December: 1009.2mbar

The month with the highest atmospheric pressure is September (1011.1mbar).
The month with the lowest atmospheric pressure is December (1009.2mbar).

Average wind speed in December
Jakarta, Indonesia

Average wind speed in December - Jakarta, Indonesia
  • Average wind speed in December: 10.8km/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).

Average humidity in December
Jakarta, Indonesia

Average humidity in December - Jakarta, Indonesia
  • Average humidity in December: 71%

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

Average rainfall in December
Jakarta, Indonesia

Average rainfall in December - Jakarta, Indonesia
  • Average rainfall in December: 123mm

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

Average rainfall days in December
Jakarta, Indonesia

Average rainfall days in December - Jakarta, Indonesia
  • Average rainfall days in December: 23.9 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).

Average sea temperature in December
Jakarta, Indonesia

Average sea temperature in December - Jakarta, Indonesia
  • Average sea temperature in December: 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).

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

Average daylight in December / Average sunshine in December - Jakarta, Indonesia
  • Average daylight in December: 12h and 3min

The month with the longest days is December (Average daylight: 12h and 30min).
The month with the shortest days is June (Average daylight: 11h and 48min).

  • Average sunshine in December: 9h and 2min

The month with the most sunshine is March (Average sunshine: 10h and 12min).
The month with the least sunshine is July (Average sunshine: 7h and 18min).

Average sunshine days in December
Jakarta, Indonesia

Average sunshine days in December - Jakarta, Indonesia
  • Average sunshine days in December: 5.7 days

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

Average UV index in December
Jakarta, Indonesia

Average UV index in December - Jakarta, Indonesia
  • Average UV index in December: 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 December
Jakarta, Indonesia

Average cloud cover in December - Jakarta, Indonesia
  • Average cloud cover in December: 43

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

Average visibility in December
Jakarta, Indonesia

Average visibility in December - Jakarta, Indonesia
  • Average visibility in December: 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).

Jakarta, Indonesia

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