June weather forecast
Surabaya, Indonesia

June extends the warmth and welcoming weather that is synonymous with Surabaya's dry season. This month offers one of the driest periods in the year, with slightly lower temperatures compared to May. Fewer rain clouds are visible as the blue and sunny skies take precedence. With calm winds and steadily reducing sea temperatures, visitors can explore water activities like sea-diving with minimized risks. Interestingly, despite June being in the midst of the year, it does not witness the maximum daylight hours.

Temperature

The arrival of June sees an average high-temperature of a still tropical 30.3°C (86.5°F), hardly diverging from May's 30.8°C (87.4°F). In June, Surabaya's temperature tends to fall to an average low of 24.9°C (76.8°F) during the night.

Heat index

Throughout June, the heat index is evaluated at a torrid 36°C (96.8°F). Adopt heightened preventive measures, heat exhaustion and heat cramps are probable. Persistent activity could lead to heatstroke.
Understand that the heat index values take into account shaded locations and mild winds. With 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 'apparent temperature' or 'feels like', arises from combining readings of air temperature and relative moisture content. Metabolic differences, pregnancy status, and the level of physical activity are additional factors influencing an individual's weather perception. By being directly under the sun, it's possible for the felt temperature to increase by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Youngsters typically face more danger than adults since they sweat less. Their larger skin surface compared to their small bodies and heightened heat production from their activities augment their vulnerability.
Evaporating sweat is a key way the human body dispels excessive warmth, all thanks to the process of perspiration. An increase in relative humidity disrupts body cooling by slowing the evaporation rate, thereby reducing the rate at which the body cools and amplifying the sense of heat. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

In Surabaya, the average relative humidity in June is 72%.

Rainfall

In Surabaya, Indonesia, in June, it is raining for 9.1 days, with typically 14mm (0.55") of accumulated precipitation. Throughout the year, in Surabaya, there are 187.8 rainfall days, and 839mm (33.03") of precipitation is accumulated.

Sea temperature

In Surabaya, Indonesia, the average seawater temperature in June is 29°C (84.2°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

June has the shortest days of the year, with an average of 11h and 42min of daylight.
On the first day of June, sunrise is at 05:35 and sunset at 17:18. On the last day of the month, sunrise is at 05:41 and sunset at 17:23 WIB.

Sunshine

In Surabaya, the average sunshine in June is 9.8h.

UV index

The months with the highest UV index in Surabaya, Indonesia, 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 vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: The maximum daily UV index, 7 in June, converts into the following recommendations:
Avoid excessive sunlight. Those with lighter skin may experience burning in less than 20 minutes. Stay out of direct sunlight between 10 a.m. and 4 p.m., when UV radiation is most intense, and remember that not all shade structures provide complete protection. To cut down UV radiation exposure by about half, sport a wide-brim hat. Note! Reflective surfaces like sand and water heighten the UV radiation levels.