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 August's arrival, Surabaya's weather records an average high-temperature of a still tropical 30.8°C, marking little difference from July's 30.1°C. Throughout the nights in August, Surabaya experiences an average low-temperature of 24.2°C.

Heat index

August's heat index is estimated at a very hot 36°C. Take more safety measures, heat exhaustion and heat cramps are potential outcomes. Persistent activity might lead to heatstroke.
Given the heat index, its values are aligned with shaded sites and gentle winds. The heat index may experience an enhancement of 15 Fahrenheit (8 Celsius) degrees under direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', comes about by integrating the temperature readings with the humidity levels. An individual's perception of weather can be influenced by a variety of factors including metabolic differences, being pregnant, and their degree of physical exertion. When directly under the sun, the weather's impact can intensify, possibly boosting the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Children typically face more danger than adults as their sweat production is usually lower. Additionally, the bigger skin surface compared to their small size and the increased heat due to their activeness exacerbate the risk.
The process of perspiration is vital for the human body to get rid of excess warmth by allowing sweat to evaporate. Under high air temperature and high humidity (high heat index) conditions, the body's ability to perspire is compromised, increasing the sensation of heat. Accumulating heat beyond the body's cooling measures leads to rising temperatures and potential ailments.

Humidity

In August, the average relative humidity is 68%.

Rainfall

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

Sea temperature

With an average sea temperature of 27.8°C, August is the month with the coldest seawater.
Note: Water temperature ranging between 25°C and 29°C is considered very warm and pleasing for everyone. It allows for enjoyable water activities over extended periods without discomfort.

Daylight

In Surabaya, Indonesia, the average length of the day in August is 11h and 53min.
On the first day of August in Surabaya, 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 in Surabaya.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index. January through December, with an average maximum UV index of 7, are months with the lowest UV index in Surabaya. A UV Index value of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: The maximum UV index of 7 during August leads to these instructions:
Sidestep overexposure. Individuals with fair complexions risk burning in fewer than 20 minutes. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Experience reduced UV exposure by about half when donning a wide-brim hat. Be attentive! The UV exposure is heightened with reflections from sand and water.
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FAQ

Is it hot in Surabaya during August?

During August, Surabaya experiences an average high-temperature of 30.8°C and a low-temperature of 24.2°C. The average heat index (a.k.a. 'felt air temperature', 'feels like'), which combines relative humidity and air temperature, in August is estimated at 36°C.

What is the average humidity in August in Surabaya?

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

What is the driest month in Surabaya?

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

How many days does it rain in August in Surabaya?

In Surabaya, Indonesia, in August, it is raining for 3.7 days, with typically 4mm of accumulated precipitation.

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

August is the month with the coldest seawater in Surabaya, Indonesia, with an average sea temperature of 27.8°C.

How warm is the water in August in Surabaya?

In Surabaya, Indonesia, the average seawater temperature in August is 27.8°C. 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.

How many hours of daylight does Surabaya have in August?

In Surabaya, Indonesia, the average day length in August 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 are the months with the most sunshine in Surabaya?

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

How many hours of sunshine does Surabaya have in August?

In August, the average sunshine duration in Surabaya 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.

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?

In August, the average daily maximum UV index in Surabaya, Indonesia, is 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to UV radiation.
Average high temperature
Average low temperature
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average sea temperature
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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).

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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).

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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).

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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%).

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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).

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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).

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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).

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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).

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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).

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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).

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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).

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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).

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Surabaya, Indonesia

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