January weather forecast
Jakarta, Indonesia

englishespañol中文
Share
The cityscape of Jakarta, Indonesia, under a dramatic evening skyline
The cityscape of Jakarta, Indonesia, under a dramatic evening skyline

Weather in January

January in Jakarta, Indonesia, starts the year off with a mix of warm temperatures, abundant rainfall, and high humidity. In comparison to December, January sees a slight increase in both temperature and humidity. The sea temperature remains consistent at 28°C (82.4°F) making beach activities still enjoyable. The majority of days are reportedly overcast with recorded cloud coverage of 46%. Wind speed this month remains moderate with a recorded average speed of 12.4km/h (7.7mph), and gusts reaching as high as 16.7km/h (10.4mph).

Temperature

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

Heat index

The heat index in January is calculated to be a fiery hot 35°C (95°F). Undertake special precautions, the probability of heat exhaustion and heat cramps is high. Prolonged activity may provoke heatstroke.
Research indicates the heat index considers values in shaded locales and with light winds. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', shows a temperature sensation when both heat and moisture conditions are combined. Additional elements including metabolic differences, the level of physical activity, and attire have a role in shaping the individual's temperature perception. One must note that being under the direct sun can escalate the heat's effects, with the heat index possibly rising by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Youngsters frequently overlook the need for breaks and fluid intake. Thirst is an advanced sign of dehydration - thereby highlighting the importance of keeping hydrated, particularly during long physical activities.
To offset high temperatures, the human body releases sweat which, upon evaporation, cools it down. When air moisture content is high, the cooling process through evaporation is not as efficient, leading to an ineffective body cooling process and a feeling of overheating. Elevated heat gain compared to the body's release capability poses risks of dehydration and potential overheating.

Humidity

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

Rainfall

In January, the rain falls for 24.8 days. Throughout January, 127mm (5") of precipitation is accumulated. In Jakarta, during the entire year, the rain falls for 252 days and collects up to 1150mm (45.28") of precipitation.

Sea temperature

The months with the coldest seawater are January and February, with an average sea temperature of 28°C (82.4°F).
Note: Engaging in swimming, diving, or other water activities is highly enjoyable in temperatures ranging from 25°C (77°F) to 29°C (84.2°F), without any unpleasant sensations for prolonged durations.

Daylight

In January, the average length of the day is 12h and 26min.
On the first day of the month, sunrise is at 05:41 and sunset at 18:10. On the last day of January, in Jakarta, sunrise is at 05:54 and sunset at 18:17 WIB.

Sunshine

The average sunshine in January in Jakarta is 9.4h.

UV index

The months with the highest UV index in Jakarta are January through December, with an average maximum UV index of 7. January through December, with an average maximum UV index of 7, are months with the lowest UV index in Jakarta. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for average individuals.
Note: An average UV index of 7 in January transforms into this advice:
Dodge overexposure. Fair-skinned people can get singed in less than 20 minutes. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Be cautious! Sand and water surfaces make the Sun's UV rays more potent.

Frequently asked questions

What is the coldest time of year in Jakarta?

Jakarta witnesses its lowest temperatures during January and February, when the average high-temperature reaches 29.8°C (85.6°F).

How hot is it in Jakarta in January?

The high-temperature, in January, in Jakarta, is 29.8°C (85.6°F), while the low-temperature averages to 25.6°C (78.1°F). The average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines relative humidity and air temperature, in January is calculated to be 35°C (95°F).

What is the average humidity in January in Jakarta?

In January, the average relative humidity is 73%.

How much does it rain in Jakarta in January?

In Jakarta, Indonesia, 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.

How warm is the water in January in Jakarta?

In January, the average sea temperature in Jakarta, Indonesia, is 28°C (82.4°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.

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

In January, the average day length in Jakarta, Indonesia, is 12h and 26min.

What time are sunrise and sunset in January in Jakarta?

On the first day of January in Jakarta, sunrise is at 05:41 and sunset at 18:10. On the last day of the month, sunrise is at 05:54 and sunset at 18:17 WIB.

How long on average sun shines in January in Jakarta?

In January, the average sunshine duration is 9.4h.

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.

When is the lowest UV index in Jakarta?

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

How high is the UV index in January in Jakarta?

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

Average temperature in January
Jakarta, Indonesia

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).
The 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 - 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 - 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 - 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 - 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 - 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 - 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 / Average sunshine in January - Jakarta, Indonesia
  • Average daylight in January: 12h and 2min

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 January: 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 January
Jakarta, Indonesia

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

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 - Jakarta, Indonesia
  • Average visibility in January: 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

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location