August weather forecast
Surabaya, Indonesia

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The skyscrapers making the cityscape of Surabaya in East Java, Indonesia
The skyscrapers making the cityscape of Surabaya in East Java, Indonesia

Weather in August

August in Surabaya introduces marginally cooler conditions and the least rainfall, offering ideal weather for urban exploration. Consistent with the ongoing dry season, the weather witnesses fewer rainy days. As August hosts the least cloudy days and maximum sunshine duration, clear days are the norm rather than the exception. A slight increase in the sea temperature indicates an enhanced appeal for aquatic activities. Varied wind speeds dominate the month, scrambling the weather pattern to deliver unique and memorable moments.

Temperature

With the onset of August, the average high-temperature registers at a still tropical 30.8°C (87.4°F), subtly different from July's 30.1°C (86.2°F). August in Surabaya generally records an average low-temperature of 24.2°C (75.6°F).

Heat index

The average heat index in August is evaluated at a fiery hot 36°C (96.8°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
The metrics for the heat index are tailored for both shady environments and light winds. 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', is a single figure representing how weather conditions feel when combining temperature and humidity. The effect is personal, with varied weather perceptions among individuals due to differences in body mass, stature, and physical activity. Awareness of direct sun exposure is crucial as it has the potential to heighten the weather's effects, pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it's vital to remain hydrated, particularly during prolonged physical activities.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. In the presence of high relative humidity, the evaporation rate diminishes, resulting in the body retaining more warmth compared to dry conditions. When body temperature rises due to excess heat gain beyond its removal capability, one might experience heat-related disorders.

Humidity

The average relative humidity in August is 68%.

Rainfall

August is the month with the least rainfall. Rain falls for 3.7 days and accumulates 4mm (0.16") of precipitation.

Sea temperature

The month with the coldest seawater in Surabaya is August, with an average sea temperature of 27.8°C (82°F).
Note: Engaging in swimming, diving, or other water activities is highly enjoyable in temperatures ranging from 25°C (77°F) to 29°C (84.2°F), without any unpleasant sensations for prolonged durations.

Daylight

The average length of the day in August is 11h and 53min.
On the first day of August, sunrise is at 05:41 and sunset at 17:29. On the last day of the month, sunrise is at 05:30 and sunset at 17:28 WIB.

Sunshine

August through October, with an average of 9.9h of sunshine, are months with the most sunshine.

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. A UV Index of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: In August, the average maximum UV index of 7 translates into the following recommendations:
Resist overexposure. Safeguarding from solar damage is indispensable. The Sun's UV radiation is at its strongest between the hours of 10 a.m. and 4 p.m. Minimize direct exposure to the sun during this period. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Caution! The Sun's UV rays become stronger due to reflections from water and sand.

Frequently asked questions

How hot is August in Surabaya?

During August, Surabaya experiences an average high-temperature of 30.8°C (87.4°F) and a low-temperature of 24.2°C (75.6°F). The average heat index (a.k.a. 'real feel', 'apparent temperature'), which combines relative humidity and air temperature, in August is evaluated at 36°C (96.8°F).

What is the average humidity in August in Surabaya?

In Surabaya, Indonesia, the average relative humidity in August is 68%.

What is the driest month in Surabaya?

The month with the least rainfall in Surabaya is August, when the rain falls for 3.7 days and typically collects 4mm (0.16") of precipitation.

How many days does it rain in August in Surabaya?

In Surabaya, in August, it is raining for 3.7 days, with typically 4mm (0.16") of accumulated precipitation.

What is the month with the coldest sea water in Surabaya?

August is the month with the coldest seawater in Surabaya, with an average sea temperature of 27.8°C (82°F).

What is the water temperature in August in Surabaya?

In August, the average sea temperature in Surabaya, Indonesia, is 27.8°C (82°F). For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

How many hours of daylight does Surabaya have in August?

The average day length in August in Surabaya, Indonesia, is 11h and 53min.

When are sunrise and sunset in August in Surabaya?

On the first day of August in Surabaya, Indonesia, sunrise is at 05:41 and sunset at 17:29. On the last day of the month, sunrise is at 05:30 and sunset at 17:28 WIB.

What is the month with the most sunshine in Surabaya?

The months with the most sunshine in Surabaya are August through October, with an average of 9.9h of sunshine.

How long on average sun shines in August in Surabaya?

In Surabaya, the average sunshine duration in August is 9.9h.

What are the months with the highest UV index in Surabaya?

January through December, with an average maximum UV index of 7, are months with the highest UV index in Surabaya.

When is the lowest UV index in Surabaya?

January through December, with an average maximum UV index of 7, are months with the lowest UV index.

How high is the UV index in August in Surabaya?

The average daily maximum UV index in August in Surabaya, Indonesia, is 7. A UV Index reading of 6 to 7 represents a high health risk from unsafe exposure to Sun's UV rays.

Average temperature in August
Surabaya, Indonesia

Average temperature in August - Surabaya, Indonesia
  • Average high temperature in August: 30.8°C

The warmest month (with the highest average high temperature) is October (32.9°C).
The months with the lowest average high temperature are January, February and July (30.1°C).

  • Average low temperature in August: 24.2°C

The month with the highest average low temperature is November (26.5°C).
The coldest month (with the lowest average low temperature) is August (24.2°C).

Average pressure in August
Surabaya, Indonesia

Average pressure in August - Surabaya, Indonesia
  • Average pressure in August: 1011.4mbar

The month with the highest atmospheric pressure is August (1011.4mbar).
The month with the lowest atmospheric pressure is December (1008.7mbar).

Average wind speed in August
Surabaya, Indonesia

Average wind speed in August - Surabaya, Indonesia
  • Average wind speed in August: 9.9km/h

The windiest month (with the highest average wind speed) is August (9.9km/h).
The calmest month (with the lowest average wind speed) is April (6.3km/h).

Average humidity in August
Surabaya, Indonesia

Average humidity in August - Surabaya, Indonesia
  • Average humidity in August: 68%

The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is October (63%).

Average rainfall in August
Surabaya, Indonesia

Average rainfall in August - Surabaya, Indonesia
  • Average rainfall in August: 4mm

The wettest month (with the highest rainfall) is February (179mm).
The driest month (with the least rainfall) is August (4mm).

Average rainfall days in August
Surabaya, Indonesia

Average rainfall days in August - Surabaya, Indonesia
  • Average rainfall days in August: 3.7 days

The month with the highest number of rainy days is January (27 days).
The month with the least rainy days is August (3.7 days).

Average sea temperature in August
Surabaya, Indonesia

Average sea temperature in August - Surabaya, Indonesia
  • Average sea temperature in August: 27.8°C

The best month for swimming (with the highest average sea temperature) is December (30.2°C).
The coldest month (with the lowest average sea temperature) is August (27.8°C).

Average daylight in August /
Average sunshine in August
Surabaya, Indonesia

Average daylight in August / Average sunshine in August - Surabaya, Indonesia
  • Average daylight in August: 11h and 5min

The month with the longest days is December (Average daylight: 12h and 30min).
The month with the shortest days is June (Average daylight: 11h and 42min).

  • Average sunshine in August: 9h and 5min

The months with the most sunshine are August, September and October (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 8h and 6min).

Average sunshine days in August
Surabaya, Indonesia

Average sunshine days in August - Surabaya, Indonesia
  • Average sunshine days in August: 26 days

The month with the most sunshine days is August (26 days).
The month with the least sunshine days is February (2.8 days).

Average UV index in August
Surabaya, Indonesia

Average UV index in August - Surabaya, Indonesia
  • Average UV index in August: 7

The months with the highest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).
The months with the lowest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).

Average cloud cover in August
Surabaya, Indonesia

Average cloud cover in August - Surabaya, Indonesia
  • Average cloud cover in August: 11

The month with the most cloud cover is January (Cloud cover 44).
The month with the least cloud cover is August (Cloud cover 11).

Average visibility in August
Surabaya, Indonesia

Average visibility in August - Surabaya, Indonesia
  • Average visibility in August: 10km

The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January and February (9km).

Surabaya, Indonesia

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