January weather forecastKoja, Indonesia

Weather in January

January, like December, in Koja, Indonesia, is another warm summer month, with an average temperature fluctuating between 29.6°C (85.3°F) and 25.6°C (78.1°F).

Temperature

The coldest temperatures occur during January, when averages reach a peak of 29.6°C (85.3°F) and a low of 25.6°C (78.1°F).

Heat index

January's heat index is calculated to be a torrid 35°C (95°F). Incorporate extra safety measures to avoid heat exhaustion and heat cramps. Continuous activity could provoke heatstroke.
Consider that heat index readings are for situations in the shade and light wind. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. Depending on the activity and the individual's heat perception, which may vary due to factors including wind, clothing, and metabolic variations, this effect remains subjective. It is essential to be conscious of the fact that direct sunlight can intensify the felt heat, leading to an elevation in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Children often overlook the need for breaks and fluid intake. Thirst is a late-stage sign of dehydration - hence, it is necessary to stay hydrated, especially during extended periods of physical activities.
The physiological way the human body responds to excessive heat is by inducing perspiration, using sweat evaporation as a cooling mechanism. With a high level of moisture in the air, the evaporation process becomes less efficient, preventing the body from cooling down efficiently and resulting in a sensation of overheating. If heat absorption exceeds the body's cooling ability, body temperature can elevate, resulting in potential thermal illnesses.

Humidity

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

Rainfall

In Koja, in January, during 28.7 rainfall days, 187mm (7.36") of precipitation is typically accumulated. Throughout the year, there are 264.8 rainfall days, and 1580mm (62.2") of precipitation is accumulated.

Daylight

In January, the average length of the day in Koja is 12h and 26min.
On the first day of January, sunrise is at 05:41 and sunset at 18:09. On the last day of the month, sunrise is at 05:54 and sunset at 18:17 WIB.

Sunshine

The average sunshine in January is 9.3h.

UV index

The months with the highest UV index in Koja are January through December, with an average maximum UV index of 7. The months with the lowest UV index are January through December, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: In January, an average UV index of 7 transforms into the following instructions:
Evade overexposure. Individuals with fair skin risk burning in under 20 minutes. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.