October 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 October

October in Surabaya introduces a slow yet perceptible transition towards the wet season as rainfall gradually increases on the city's vista. The weather remains on the warmer side, but the rising sea temperatures and cloud cover indicate a change in the season. A notable feature of October's weather is the consistent wind speeds that influence the temperatures subtly. Sunshine hours start to reduce, signaling shorter days. As October progresses, the dawn of the rain season is seen through the increasing number and intensity of rainy days.

Temperature

October brings the highest temperatures, with an average high of 32.9°C (91.2°F) and an average low of 26.4°C (79.5°F).

Heat index

Throughout October, the heat index is evaluated at an extremely hot 40°C (104°F). Ensure heightened precautions, risk of heat cramps and heat exhaustion is significant. Sustained activity could provoke heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. The heat index might be elevated by 15 Fahrenheit (8 Celsius) degrees due to direct sun exposure.
Note: The heat index, also known as 'feels like' or 'apparent temperature', unifies temperature and humidity readings to offer a comprehensive feel of warmth. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. With the sun shining directly, it's crucial to understand that it can increase the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Kids often lack the knowledge about the necessity to take breaks and consume liquids. Thirst, as a late symptom of dehydration, necessitates the maintenance of hydration, particularly during enduring physical activities.
The body's inherent cooling system operates through perspiration, wherein evaporating sweat offsets excessive heat. When there is abundant moisture in the air, the body's cooling through the evaporation process becomes less effective, leading to the sensation of overheating. Overheating can ensue when the body accumulates more heat than it can release, and dehydration severity may vary.

Humidity

With an average relative humidity of 63%, October is the least humid month in Surabaya.

Rainfall

In Surabaya, in October, it is raining for 7.6 days, with typically 14mm (0.55") of accumulated precipitation. In Surabaya, during the entire year, the rain falls for 187.8 days and collects up to 839mm (33.03") of precipitation.

Sea temperature

In October, the average sea temperature in Surabaya, Indonesia, is 28.9°C (84°F).
Note: Surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as excellent and extremely agreeable for enduring enjoyment in water activities.

Daylight

In Surabaya, the average length of the day in October is 12h and 16min.
On the first day of October in Surabaya, sunrise is at 05:13 and sunset at 17:23. On the last day of the month, sunrise is at 05:01 and sunset at 17:23 WIB.

Sunshine

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

UV index

The months with the highest UV index in Surabaya are January through December, with an average maximum UV index of 7. The months with the lowest UV index are January through December, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for the average person.
Note: The daily high UV index of 7 during October translates into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned 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. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Be wary! Reflections from sand and water make UV radiation more intense.

Frequently asked questions

What is the warmest month in Surabaya?

With its average high temperature of 32.9°C (91.2°F) and a low of 26.4°C (79.5°F), October is regarded as the warmest month.

How hot is it in Surabaya in October?

The average high-temperature and low-temperature in Surabaya during October are 32.9°C (91.2°F) and 26.4°C (79.5°F) respectively. In October, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which represents the influence of relative humidity on air temperature, is evaluated at 40°C (104°F).

What is the least humid month in Surabaya?

October is the least humid month, with an average relative humidity of 63%.

What is the average humidity in October in Surabaya?

In October, the average relative humidity in Surabaya is 63%.

How much does it rain in Surabaya in October?

In Surabaya, Indonesia, during October, the rain falls for 7.6 days and regularly aggregates up to 14mm (0.55") of precipitation.

What is the water temperature in October in Surabaya?

In October, the average sea temperature in Surabaya, Indonesia, is 28.9°C (84°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 October?

In October, the average day length in Surabaya is 12h and 16min.

When is the sunrise / sunset in October in Surabaya?

On the first day of October in Surabaya, sunrise is at 05:13 and sunset at 17:23. On the last day of the month, sunrise is at 05:01 and sunset at 17:23 WIB.

What are the months with the most sunshine in Surabaya?

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

How long on average sun shines in October in Surabaya?

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

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?

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

What is the UV index intensity in October in Surabaya?

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

Average temperature in October
Surabaya, Indonesia

Average temperature in October - Surabaya, Indonesia
  • Average high temperature in October: 32.9°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 October: 26.4°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 October
Surabaya, Indonesia

Average pressure in October - Surabaya, Indonesia
  • Average pressure in October: 1010.5mbar

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 October
Surabaya, Indonesia

Average wind speed in October - Surabaya, Indonesia
  • Average wind speed in October: 9.1km/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 October
Surabaya, Indonesia

Average humidity in October - Surabaya, Indonesia
  • Average humidity in October: 63%

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

Average rainfall in October
Surabaya, Indonesia

Average rainfall in October - Surabaya, Indonesia
  • Average rainfall in October: 14mm

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

Average rainfall days in October
Surabaya, Indonesia

Average rainfall days in October - Surabaya, Indonesia
  • Average rainfall days in October: 7.6 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 October
Surabaya, Indonesia

Average sea temperature in October - Surabaya, Indonesia
  • Average sea temperature in October: 28.9°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 October /
Average sunshine in October
Surabaya, Indonesia

Average daylight in October / Average sunshine in October - Surabaya, Indonesia
  • Average daylight in October: 12h and 2min

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 October: 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 October
Surabaya, Indonesia

Average sunshine days in October - Surabaya, Indonesia
  • Average sunshine days in October: 19.9 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 October
Surabaya, Indonesia

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

Average cloud cover in October - Surabaya, Indonesia
  • Average cloud cover in October: 14

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 October
Surabaya, Indonesia

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