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 average high-temperature during June registers at a still tropical 30.3°C, closely corresponding to the preceding month. June brings Surabaya a consistent average low-temperature of 24.9°C.

Heat index

In June, the heat index is estimated at a very hot 36°C. Adopt special protective actions against heat exhaustion and heat cramps. Long-duration activity risks heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', evaluates the perceived heat by adding the effect of moisture in the air. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Being aware that direct sunlight can impact the felt heat might mean an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Young children are more at risk than adults since they tend to sweat less. Moreover, their large skin surface in proportion to their small bodies and the high heat production due to their activities contribute to their vulnerability.
Perspiration is the body's default response to elevated temperatures, as it promotes the evaporation of sweat to achieve cooling. Greater relative humidity lessens the rate of evaporation, thus decreasing the body's heat dispersal, which gives rise to a sensation of overheating. When the body is unable to balance heat gain, its temperature elevates, which may induce thermal illnesses.

Humidity

The average relative humidity in June is 72%.

Rainfall

In June, in Surabaya, the rain falls for 9.1 days. Throughout June, 14mm of precipitation is accumulated. In Surabaya, during the entire year, the rain falls for 187.8 days and collects up to 839mm of precipitation.

Sea temperature

In Surabaya, in June, the average water temperature is 29°C.
Note: For any water activity, temperatures between 25°C and 29°C are deemed excellent and extremely satisfying for enduring periods.

Daylight

The month with the shortest days is June, with an average of 11h and 42min of daylight.
On the first day of June, sunrise is at 05:34 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, Indonesia, the average sunshine in June is 9.8h.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index in Surabaya. January through December, with an average maximum UV index of 7, are months with the lowest UV index in Surabaya, Indonesia. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for the average person.
Note: The UV index of 7 during June translates into the following guidance:
Adopt measures and apply sun safety strategies. Shielding from skin and eye damage is necessary. 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. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Be cautious! Sand and water surfaces make the Sun's UV rays more potent.