January Weather in Surabaya, Indonesia

Last updated: August 23, 2025

In January, the average temperature in Surabaya, Indonesia is a warm 27°C (81°F), with daily highs reaching up to 35°C (95°F) and lows dipping to 23°C (73°F). However, this period also brings 257 mm (10.1 in) of precipitation spread over 23 days, resulting in a remarkably high average humidity of 85%. Whether you're enjoying the sun or preparing for rain, be ready for a humid summer experience!

January Temperature in Surabaya

In January in Surabaya, the average temperature is 27°C (81°F), with a maximum that can reach 35°C (95°F) and a minimum that can drop to 23°C (73°F). This pleasant weather makes it an ideal time for outdoor activities and sightseeing.

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

The chart illustrates January 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, January typically has an average temperature of 27°C (81°F), with highs reaching up to 35°C (95°F) and lows dropping to around 23°C (73°F).

Data source: Temperature data for Surabaya generated using information from the Copernicus Climate Change Service.

January Precipitation in Surabaya

In Surabaya in January, the precipitation amount is 257 mm (10.1 in) spread over 23 days, indicating a significant level of rainfall during that time.

January Precipitation Trends in Surabaya

The chart displays monthly precipitation patterns in Surabaya, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Surabaya, January typically receives around 257 mm (10.1 inches) of precipitation spread over approximately 23 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in Surabaya

In Surabaya in January humidity is 85%. With an average temperature of 27°C (81°F), this humidity feels like a thick blanket enveloping you, making every step feel heavier as sweat clings to your skin and the air feels almost tangible, which can be quite challenging for traveling.

January Average Humidity in Surabaya

This chart illustrates the average monthly humidity levels in Surabaya, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Surabaya is approximately 85%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Surabaya

In Surabaya in January, the maximum UV index reaches an alarming 15, which falls into the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take precautions. For detailed information, you can check the Hourly UV Index in Surabaya.

Maximum UV Index Levels in Surabaya for January

The chart shows the monthly maximum UV Index (UVI) for Surabaya in January, 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 January, the maximum UV index in Surabaya typically reaches 15, which falls under the extreme exposure category.

Data source: Surabaya January 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 January 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 January’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 January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	27°C (81°F)	257 mm (10.1 inches)	85%	extreme
February Weather	27°C (81°F)	325 mm (12.8 inches)	86%	extreme
March Weather	27°C (81°F)	418 mm (16.4 inches)	84%	extreme
April Weather	28°C (82°F)	318 mm (12.5 inches)	82%	extreme
May Weather	28°C (82°F)	242 mm (9.5 inches)	80%	extreme
June Weather	27°C (81°F)	198 mm (7.8 inches)	80%	extreme
July Weather	27°C (80°F)	107 mm (4.2 inches)	80%	extreme
August Weather	27°C (80°F)	77 mm (3.0 inches)	78%	extreme
September Weather	27°C (81°F)	97 mm (3.8 inches)	74%	extreme
October Weather	28°C (82°F)	118 mm (4.6 inches)	76%	extreme
November Weather	28°C (82°F)	250 mm (9.8 inches)	78%	extreme
December Weather	27°C (81°F)	340 mm (13.4 inches)	80%	extreme