May 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 May

May in Surabaya marks the real advent of the dry season with minimum rainfall recorded at 47mm (1.85"). Encouragingly, sun lovers will enjoy the steadily increasing sunshine hours. The weather remains warm, but the declining humidity levels create a charmingly comfortable atmosphere. As the wet season's receding show, sea temperatures continue to drop while maintaining ideal swimming and water sport conditions. By the end of the month, residents and visitors can look forward to more sunshine and less rainfall.

Temperature

May experiences an average high-temperature of a still tropical 30.8°C (87.4°F), barely different from April's 30.5°C (86.9°F). An average low-temperature of 25.7°C (78.3°F) is recorded during the nights in May in Surabaya.

Heat index

The heat index value for May is evaluated at a fiery hot 38°C (100.4°F). Take more preventive steps, risk of heat exhaustion and heat cramps is elevated. Long activity may culminate in heatstroke.
Heat index guidelines indicate values are for light wind scenarios and shaded regions. Being under direct sunlight might amplify the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', stands as a testimony to how temperature and humidity combine to impact our sense of warmth. The impact of weather is individual, with diverse individuals experiencing it differently due to variations in body mass, height, and activity levels. Understand that direct sun rays can influence the weather's impact, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Children frequently underestimate the necessity to rest and hydrate. Thirst is a late sign of dehydration - thus, it is vital to stay hydrated, particularly during lengthy physical exercises.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. Elevated relative humidity diminishes evaporation, thereby reducing the body's ability to shed heat and creating a feeling of being too warm. Should the body fail to balance its heat gain, the escalating temperature poses health challenges.

Humidity

In May, the average relative humidity in Surabaya is 74%.

Rainfall

In May, the rain falls for 14.1 days. Throughout May, 47mm (1.85") of precipitation is accumulated. Throughout the year, there are 187.8 rainfall days, and 839mm (33.03") of precipitation is accumulated.

Sea temperature

In Surabaya, in May, the average water temperature is 29.5°C (85.1°F).
Note: Water temperatures between 25°C (77°F) and 29°C (84.2°F) are ideal for all water activities, offering enjoyment without causing discomfort over extended periods.

Daylight

The average length of the day in May is 11h and 47min.
On the first day of the month, sunrise is at 05:30 and sunset at 17:21. On the last day of May, in Surabaya, Indonesia, sunrise is at 05:34 and sunset at 17:18 WIB.

Sunshine

In May, the average sunshine in Surabaya is 9.5h.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index in Surabaya. The months with the lowest UV index are January through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: A maximum UV index of 7 in May translates into the following recommendations:
Evade overexposure. Individuals with fair skin risk burning in under 20 minutes. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Be on guard! The reflective nature of sand and water boosts UV exposure.

Frequently asked questions

Is it hot in Surabaya during May?

In Surabaya, 30.8°C (87.4°F) is the average high-temperature and 25.7°C (78.3°F) is the average low-temperature during May. In May, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, is evaluated at 38°C (100.4°F).

What is the average humidity in May in Surabaya?

The average relative humidity in May is 74%.

How much does it rain in Surabaya in May?

In Surabaya, during May, the rain falls for 14.1 days and regularly aggregates up to 47mm (1.85") of precipitation.

How warm is the water in May in Surabaya?

In Surabaya, the average seawater temperature in May is 29.5°C (85.1°F). For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

How many hours of daylight does Surabaya have in May?

The average day length in May in Surabaya is 11h and 47min.

What time are sunrise and sunset in May in Surabaya?

In May, on the first day of the month, sunrise is at 05:30 and sunset at 17:21. On the last day of the month, in Surabaya, Indonesia, sunrise is at 05:34 and sunset at 17:18 WIB.

How long on average sun shines in May in Surabaya?

In Surabaya, Indonesia, the average sunshine duration in May is 9.5h.

What is the month 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.

What is the UV index intensity in May in Surabaya?

In Surabaya, Indonesia, the average daily maximum UV index in May is 7. A UV Index estimate of 6 to 7 represents a high hazard to health from exposure to Sun's UV rays.

Average temperature in May
Surabaya, Indonesia

Average temperature in May - Surabaya, Indonesia
  • Average high temperature in May: 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 May: 25.7°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 May
Surabaya, Indonesia

Average pressure in May - Surabaya, Indonesia
  • Average pressure in May: 1010mbar

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 May
Surabaya, Indonesia

Average wind speed in May - Surabaya, Indonesia
  • Average wind speed in May: 7.5km/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 May
Surabaya, Indonesia

Average humidity in May - Surabaya, Indonesia
  • Average humidity in May: 74%

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

Average rainfall in May
Surabaya, Indonesia

Average rainfall in May - Surabaya, Indonesia
  • Average rainfall in May: 47mm

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

Average rainfall days in May
Surabaya, Indonesia

Average rainfall days in May - Surabaya, Indonesia
  • Average rainfall days in May: 14.1 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 May
Surabaya, Indonesia

Average sea temperature in May - Surabaya, Indonesia
  • Average sea temperature in May: 29.5°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 May /
Average sunshine in May
Surabaya, Indonesia

Average daylight in May / Average sunshine in May - Surabaya, Indonesia
  • Average daylight in May: 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 May: 9h and 3min

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 May
Surabaya, Indonesia

Average sunshine days in May - Surabaya, Indonesia
  • Average sunshine days in May: 13.1 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 May
Surabaya, Indonesia

Average UV index in May - Surabaya, Indonesia
  • Average UV index in May: 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 May
Surabaya, Indonesia

Average cloud cover in May - Surabaya, Indonesia
  • Average cloud cover in May: 22

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 May
Surabaya, Indonesia

Average visibility in May - Surabaya, Indonesia
  • Average visibility in May: 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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