January weather forecast and climate
Jakarta, Indonesia

The cityscape of Jakarta, Indonesia, under a dramatic evening skyline
The cityscape of Jakarta, Indonesia, under a dramatic evening skyline
January, the same as December, is another warm summer month in Jakarta, Indonesia, with average temperature fluctuating between 29.8°C (85.6°F) and 25.6°C (78.1°F).

Temperature

The coldest months are January and February, with an average high-temperature of 29.8°C (85.6°F).

Heat index

In January, the average heat index is evaluated at a very hot 35.3°C (95.5°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'apparent temperature', 'feels like', or 'felt air temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Additional factors like activity, pregnancy, differences in body mass, height, and shape, and metabolic differences affect individual temperature impact. 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. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

In Jakarta, the average relative humidity is 73%.

Rainfall

In Jakarta, in January, during 24.8 rainfall days, 127mm (5") 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

January and February, with an average sea temperature of 28°C (82.4°F), are months with the coldest seawater.
Note: For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

In Jakarta, the average length of the day is 12.4h.

Sunshine

In Jakarta, Indonesia, the average sunshine in January is 9.4h.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index. Months with the lowest UV index in Jakarta, Indonesia, are January through December, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health risk from the exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 7 in January interpret into the following advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.

What is the coldest month in Jakarta?

The coldest months in Jakarta are January and February, with an average high-temperature of 29.8°C (85.6°F).

What is the temperature in January in Jakarta?

In January, in Jakarta, Indonesia, the average high-temperature is 29.8°C (85.6°F), and the average low-temperature is 25.6°C (78.1°F). The average heat index (a.k.a. 'apparent temperature', 'feels like'), that takes the relative humidity and factores it into the air temperature reading, in January is calculated to 35.3°C (95.5°F).

What is the average humidity in January in Jakarta?

In January, the average relative humidity in Jakarta is 73%.

How many days does it rain in January in Jakarta?

In Jakarta, in January, it is raining for 24.8 days, with typically 127mm (5") of accumulated precipitation.

What months are the sea coldest in Jakarta?

January and February, with an average sea temperature of 28°C (82.4°F), are months with the coldest seawater in Jakarta.

How warm is the water in January in Jakarta?

In January, the average sea temperature is 28°C (82.4°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 January?

In January, the average length of the day in Jakarta is 12.4h.

How long on average sun shines in January in Jakarta?

The average sunshine in January is 9.4h.

When is the highest UV index in Jakarta?

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

What is the month 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.

What is the UV index intensity in January in Jakarta?

In January, the average daily maximum UV index in Jakarta, Indonesia, is 7. A UV Index estimate of 6 to 7 represents a high health threat from unprotected exposure to the UV radiation.
Average temperature in January - Jakarta, Indonesia
  • Average high temperature in January: 29.8°C

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

  • Average low temperature in January: 25.6°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 January - Jakarta, Indonesia
  • Average pressure in January: 1009.7mbar

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 January - Jakarta, Indonesia
  • Average wind speed in January: 12.4km/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 January - Jakarta, Indonesia
  • Average humidity in January: 73%

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

Average rainfall in January - Jakarta, Indonesia
  • Average rainfall in January: 127mm

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

Average rainfall days in January - Jakarta, Indonesia
  • Average rainfall days in January: 24.8 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 January - Jakarta, Indonesia
  • Average sea temperature in January: 28°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 January / Average sunshine in January - Jakarta, Indonesia
  • Average daylight in January: 12.4h

The month with the longest days is December (Average daylight: 12.5h).
Months with the shortest days are May, June and July (Average daylight: 11.8h).

  • Average sunshine in January: 9.4h

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

Average sunshine days in January - Jakarta, Indonesia
  • Average sunshine days in January: 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).

Average UV index in January - Jakarta, Indonesia
  • Average UV index in January: 7

Months with the highest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).
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 January - Jakarta, Indonesia
  • Average cloud cover in January: 46

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 January - Jakarta, Indonesia
  • Average visibility in January: 10km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).