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 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

Surabaya's coldest months, January, February and July, record an average high-temperature of 30.1°C.

Heat index

In July, the average heat index is estimated at a very hot 36°C. More safety actions are required, heat exhaustion and heat cramps are probable. Long-term activity may precipitate heatstroke.
Consider that heat index readings are for situations in the shade and light wind. Exposing to direct sunshine may enhance heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. 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 quite important for babies and toddlers. Young ones are generally at greater risk than adults due to their limited sweating ability. In addition, their large skin surface relative to their small bodies and higher heat production from their activities add to their vulnerability.
In the face of high temperatures, the human body's reflex is to perspire, leveraging sweat evaporation for cooling. An increase in relative humidity hinders the body's normal cooling function by reducing evaporation, thereby decreasing the rate of body cooling and enhancing the sense of warmth. 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 July is 71%.

Rainfall

In July, the rain falls for 7.8 days. Throughout July, 13mm of precipitation is accumulated. Throughout the year, there are 187.8 rainfall days, and 839mm of precipitation is accumulated.

Sea temperature

In Surabaya, in July, the average water temperature is 28.3°C.
Note: Water temperature between 25°C and 29°C is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

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

Sunshine

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

UV index

The months with the highest UV index are January through December, with an average maximum UV index of 7. The months with the lowest UV index in Surabaya are January through December, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: The maximum daily UV index of 7 in July converts into the following recommendations:
Resist overexposure. Safeguarding from solar damage is indispensable. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Note! Reflective surfaces like sand and water heighten the UV radiation levels.