January weather forecast
Gresik, Indonesia

January, the same as December, in Gresik, Indonesia, is a hot summer month, with temperature in the range of an average high of 30°C (86°F) and an average low of 25.1°C (77.2°F).

Temperature

January, recording an average high temperature of 30°C (86°F) and a low temperature of 25.1°C (77.2°F), is Gresik's coldest month.

Heat index

For most parts of January, the heat index is computed to be a sweltering 38°C (100.4°F). Greater safety measures are needed, risk of heat exhaustion and heat cramps is high. Continuous activity might trigger heatstroke.
Always consider that heat index estimations are for light winds and places in the shade. Exposure to the direct sun might augment heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', gives an indication of how one might feel in terms of heat after considering humidity. 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. Given direct exposure to sunlight, one might experience a rise in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. In the presence of elevated relative humidity, the evaporation rate decreases. This reduction leads to increased body heat retention compared to conditions of dry air. If heat absorption isn't effectively countered by the body's cooling methods, body temperature surges, hinting at potential problems.

Humidity

The months with the highest humidity in Gresik are January and February, with an average relative humidity of 81%.

Rainfall

In Gresik, during January, the rain falls for 21.3 days and regularly aggregates up to 74mm (2.91") of precipitation. In Gresik, Indonesia, during the entire year, the rain falls for 159.4 days and collects up to 403mm (15.87") of precipitation.

Sea temperature

In January, the average sea temperature in Gresik is 29.3°C (84.7°F).
Note: Swimming, diving, and similar water activities in temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are seen as very agreeable and pleasurable for lengthy periods without discomfort.

Daylight

In Gresik, the average length of the day in January is 12h and 29min.
On the first day of the month, sunrise is at 05:16 and sunset at 17:48. On the last day of January, in Gresik, Indonesia, sunrise is at 05:29 and sunset at 17:55 WIB.

Sunshine

The month with the least sunshine is January, with an average of 7.6h of sunshine.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index. January through December, with an average maximum UV index of 7, are months with the lowest UV index in Gresik. A UV Index value of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In January, the maximum UV index of 7 suggests these recommendations:
Adopt measures and apply sun safety strategies. Shielding from skin and eye damage is necessary. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Beware! Reflections from sand and water can intensify the Sun's UV radiation.