January weather forecast
Jember, Indonesia

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Weather in January

In Jember, Indonesia, January typically begins the year with an elevated level of humidity, setting the atmospheric tone for the month. Rainfall averages at 252mm (9.92"), making it the third-highest in terms of precipitation. During this time, the skies tend to be cloudier and the visibility slightly reduced. This pattern results in extended periods of overcast conditions, making it an ideal time for indoor activities. As January proceeds, a slight increase in daylight duration is observed, ushering in longer sunny periods.

Temperature

January's advent notes a subtle adjustment in average high-temperature to a moderately hot 29.9°C (85.8°F) from December. During January, the average low-temperature in Jember is a still warm 23.2°C (73.8°F).

Heat index

In January, the heat index is estimated at a very hot 38°C (100.4°F). Special measures are necessary to avoid heat cramps and heat exhaustion. Persistent activity could result in heatstroke.
It is essential to grasp that the heat index's numbers are for shade and light wind settings. In the presence of direct sunshine, the heat index could be augmented by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', reflects the blend of air temperature and relative humidity to give a temperature impression. This effect is personal, influenced by the individual's physical activity and heat sensitivity, shaped by factors including wind, attire, and metabolic variations. Direct sun rays can make one feel hotter, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Children regularly disregard the necessity to rest and replenish fluids. Thirst is a late symptom of dehydration - thus, maintaining hydration, particularly during long-lasting physical activities, is essential.
Normally, the human body cools itself through perspiration, which removes excessive heat by evaporating sweat. When there is an excess of moisture in the atmosphere, the efficiency of the evaporation process is lessened, leading to less efficient body cooling and a sensation of overheating. Potential thermal conditions emerge as the body's heat gain outpaces its cooling mechanisms.

Humidity

The average relative humidity in January is 83%.

Rainfall

In Jember, during January, the rain falls for 30.5 days and regularly aggregates up to 252mm (9.92") of precipitation. In Jember, during the entire year, the rain falls for 247.8 days and collects up to 1536mm (60.47") of precipitation.

Daylight

In Jember, the average length of the day in January is 12h and 32min.
On the first day of the month, sunrise is at 05:10 and sunset at 17:46. On the last day of January, sunrise is at 05:24 and sunset at 17:52 WIB.

Sunshine

The month with the least sunshine is January, with an average of 6.9h of sunshine.

UV index

January and March, with an average maximum UV index of 6, are months with the lowest UV index in Jember. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: In January, the average maximum UV index of 6 translates into the following recommendations:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.

Frequently asked questions

How hot is January in Jember?

January temperatures in Jember vary between a high-temperature of 29.9°C (85.8°F) and a low-temperature of 23.2°C (73.8°F). The average heat index (a.k.a. 'apparent temperature', 'feels like'), which represents the influence of relative humidity on air temperature, in January is estimated at 38°C (100.4°F).

What is the average humidity in January in Jember?

The average relative humidity in January in Jember, Indonesia, is 83%.

How many days does it rain in January in Jember?

In January, in Jember, Indonesia, the rain falls for 30.5 days. Throughout January, 252mm (9.92") of precipitation is accumulated.

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

In Jember, Indonesia, the average day length in January is 12h and 32min.

When is the sunrise / sunset in January in Jember?

In January, on the first day of the month, sunrise is at 05:10 and sunset at 17:46. On the last day of the month, sunrise is at 05:24 and sunset at 17:52 WIB.

What is the month with the least sunshine in Jember?

The month with the least sunshine is January, with an average of 6.9h of sunshine.

How many hours of sunshine does Jember have in January?

In Jember, Indonesia, the average sunshine duration in January is 6.9h.

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

January and March, with an average maximum UV index of 6, are months with the lowest UV index in Jember, Indonesia.

What is the UV index reading in January in Jember?

The average daily maximum UV index in January in Jember is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Jember, Indonesia

Average temperature in January - Jember, Indonesia
  • Average high temperature in January: 29.9°C

The warmest month (with the highest average high temperature) is October (34.5°C).
The months with the lowest average high temperature are February and March (29.8°C).

  • Average low temperature in January: 23.2°C

The month with the highest average low temperature is November (24.3°C).
The coldest month (with the lowest average low temperature) is August (21.3°C).

Average pressure in January
Jember, Indonesia

Average pressure in January - Jember, Indonesia
  • Average pressure in January: 1009.1mbar

The months with the highest atmospheric pressure are August and September (1011.5mbar).
The month with the lowest atmospheric pressure is December (1008.8mbar).

Average wind speed in January
Jember, Indonesia

Average wind speed in January - Jember, Indonesia
  • Average wind speed in January: 6.8km/h

The windiest month (with the highest average wind speed) is September (8.8km/h).
The calmest month (with the lowest average wind speed) is April (5.1km/h).

Average humidity in January
Jember, Indonesia

Average humidity in January - Jember, Indonesia
  • Average humidity in January: 83%

The month with the highest relative humidity is February (86%).
The months with the lowest relative humidity are September and October (65%).

Average rainfall in January
Jember, Indonesia

Average rainfall in January - Jember, Indonesia
  • Average rainfall in January: 252mm

The wettest month (with the highest rainfall) is March (283mm).
The driest month (with the least rainfall) is August (10mm).

Average rainfall days in January
Jember, Indonesia

Average rainfall days in January - Jember, Indonesia
  • Average rainfall days in January: 30.5 days

The month with the highest number of rainy days is January (30.5 days).
The month with the least rainy days is August (6 days).

Average daylight in January /
Average sunshine in January
Jember, Indonesia

Average daylight in January / Average sunshine in January - Jember, Indonesia
  • Average daylight in January: 12h and 3min

The month with the longest days is December (Average daylight: 12h and 36min).
The month with the shortest days is June (Average daylight: 11h and 42min).

  • Average sunshine in January: 6h and 5min

The month with the most sunshine is October (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 6h and 54min).

Average sunshine days in January
Jember, Indonesia

Average sunshine days in January - Jember, Indonesia
  • Average sunshine days in January: 0.3 days

The month with the most sunshine days is August (22.6 days).
The month with the least sunshine days is February (0.1 days).

Average UV index in January
Jember, Indonesia

Average UV index in January - Jember, Indonesia
  • Average UV index in January: 6

The months with the highest UV index are February, April, May, June, July, August, September, October, November and December (UV index 7).
The months with the lowest UV index are January and March (UV index 6).

Average cloud cover in January
Jember, Indonesia

Average cloud cover in January - Jember, Indonesia
  • Average cloud cover in January: 53

The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are August and September (Cloud cover 19).

Average visibility in January
Jember, Indonesia

Average visibility in January - Jember, Indonesia
  • Average visibility in January: 8km

The months with the highest visibility are June, July, August, September and October (10km).
The months with the lowest visibility are January, February, March and April (8km).

Jember, Indonesia

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