July weather forecast
Surabaya, Indonesia

The weather in July in Surabaya delivers consistently warm temperatures amid declining rainfall. Slight humidity sees the city basking comfortably in the dry season. The sea temperature dips to its lowest at 27.8°C (82°F) but maintains enough warmth for sea-going activities. A peculiarity of July is the measured upturn in wind speeds, giving a slight breezy feeling in the afternoon. By the month's end, a further decrease in rainfall is perceptible, indicative of the ongoing dry season's peak.

Temperature

January, February and July are known as Surabaya's coldest months, with an average high-temperature of 30.1°C (86.2°F).

Heat index

July's heat index is evaluated at a fiery hot 36°C (96.8°F). More preventive actions are needed, risk of heat exhaustion and heat cramps is significant. Prolonged activity may trigger heatstroke.
It is essential to grasp that the heat index's numbers are for shade and light wind settings. Heat index values may be hiked up by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is the result of factoring in humidity to the air temperature, indicating perceived warmth. Additional factors encompassing metabolic differences, the level of physical activity, and clothing can impact the individual's perception of temperature. 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 particularly meaningful 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. Greater relative humidity lessens the rate of evaporation, thus decreasing the body's heat dispersal, which gives rise to a sensation of overheating. Overheating and potential dehydration arise when body heat gain eclipses its release capability.

Humidity

The average relative humidity in July in Surabaya is 71%.

Rainfall

In Surabaya, Indonesia, in July, it is raining for 7.8 days, with typically 13mm (0.51") of accumulated precipitation. Throughout the year, there are 187.8 rainfall days, and 839mm (33.03") of precipitation is accumulated.

Sea temperature

In Surabaya, the average seawater temperature in July is 28.3°C (82.9°F).
Note: Water activities in surface temperatures between 25°C (77°F) and 29°C (84.2°F) are seen as exceptional and extremely agreeable for lengthened time spans.

Daylight

The average length of the day in July in Surabaya is 11h and 45min.
On the first day of July in Surabaya, sunrise is at 05:41 and sunset at 17:24. On the last day of the month, sunrise is at 05:41 and sunset at 17:29 WIB.

Sunshine

The average sunshine in July is 9.8h.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index. The months with the lowest UV index in Surabaya, Indonesia, are January through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: The UV index of 7 during July leads to these advisories:
Dodge overexposure. Fair-skinned people can get singed in less than 20 minutes. To the best of your ability, limit your exposure to the sun between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Heads up! The reflection of sand and water notably intensifies UV rays from the Sun.