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December Weather in Surabaya, Indonesia

Last updated: August 23, 2025

In December, the average temperature in Surabaya, Indonesia is a warm 27°C (81°F), with minimums dipping to 23°C (74°F) and maximums reaching up to 35°C (96°F). During this month, expect 340 mm (13.4 in) of precipitation spread across 29 days, contributing to an average humidity level of 80%. Enjoy the warmth but be prepared for the rain!

December Temperature in Surabaya

In December in Surabaya, the average temperature is 27°C (81°F). Maximums can reach 35°C (96°F), and minimums can be as low as 23°C (74°F). This makes it an ideal time for travelers seeking warm weather and enjoyable outdoor activities.

December Weather in Surabaya: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Surabaya, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Surabaya, December typically has an average temperature of 27°C (81°F), with highs reaching up to 35°C (96°F) and lows dropping to around 23°C (74°F).
JanFebMarAprMayJunJulAugSepOctNovDec818181828281808081828281
Data source: Temperature data for Surabaya generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Surabaya

In Surabaya in December, the total precipitation amount reaches 340 mm (13.4 in) over the course of 29 days.

December Precipitation Trends in Surabaya

The chart displays monthly precipitation patterns in Surabaya, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Surabaya, December typically receives around 340 mm (13.4 inches) of precipitation spread over approximately 29 days.
JanFebMarAprMayJunJulAugSepOctNovDec2573254183182421981077797118250340
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Surabaya

In Surabaya in December humidity is 80%. With an average temperature of 27°C (81°F), this humidity feels like a warm, enveloping blanket that clings to your skin, making travel tiring as sweat beads form quickly and the air feels thick and heavy.

December Average Humidity in Surabaya

This chart illustrates the average monthly humidity levels in Surabaya, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Surabaya is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%86%84%82%80%80%80%78%74%76%78%80%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Surabaya

In Surabaya in December, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in Surabaya, you can check here.

Maximum UV Index Levels in Surabaya for December

The chart shows the monthly maximum UV Index (UVI) for Surabaya in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Surabaya typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec151516151311121314151514
Data source: Surabaya December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How December Weather in Surabaya Compares to Other Months

Weather in Surabaya varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Surabaya, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Surabaya, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather27°C (81°F)257 mm (10.1 inches)85%extreme
February Weather27°C (81°F)325 mm (12.8 inches)86%extreme
March Weather27°C (81°F)418 mm (16.4 inches)84%extreme
April Weather28°C (82°F)318 mm (12.5 inches)82%extreme
May Weather28°C (82°F)242 mm (9.5 inches)80%extreme
June Weather27°C (81°F)198 mm (7.8 inches)80%extreme
July Weather27°C (80°F)107 mm (4.2 inches)80%extreme
August Weather27°C (80°F)77 mm (3.0 inches)78%extreme
September Weather27°C (81°F)97 mm (3.8 inches)74%extreme
October Weather28°C (82°F)118 mm (4.6 inches)76%extreme
November Weather28°C (82°F)250 mm (9.8 inches)78%extreme
December Weather27°C (81°F)340 mm (13.4 inches)80%extreme

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