January Weather in Sleman, Indonesia

Last updated: August 23, 2025

In January, the average temperature in Sleman, Indonesia is a warm 26°C (79°F). Expect the minimum to drop to 21°C (70°F) and the maximum to peak at a comforting 32°C (91°F). During this month, precipitation totals about 320 mm (12.6 in) across approximately 24 days, leading to an average humidity of 82%. Be prepared for a wonderfully humid climate!

January Temperature in Sleman

In January in Sleman, the average temperature is 26°C (79°F). Maximums can reach 32°C (91°F), while minimums can drop to 21°C (70°F). This makes Sleman an ideal destination for travelers seeking warm and pleasant weather.

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

The chart illustrates January temperature patterns in Sleman, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sleman, January typically has an average temperature of 26°C (79°F), with highs reaching up to 32°C (91°F) and lows dropping to around 21°C (70°F).

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

January Precipitation in Sleman

In Sleman in January, the precipitation amount is 320 mm (12.6 in) over a span of 24 days.

January Precipitation Trends in Sleman

The chart displays monthly precipitation patterns in Sleman, 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 Sleman, January typically receives around 320 mm (12.6 inches) of precipitation spread over approximately 24 days.

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

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Millimeters (mm) Inches (in)

January Humidity in Sleman

In Sleman in January, humidity is 82%. With an average temperature of 26°C (79°F), this humidity feels like a warm blanket that envelops you, making outdoor activities feel more taxing and requiring frequent breaks to stay hydrated.

January Average Humidity in Sleman

This chart illustrates the average monthly humidity levels in Sleman, 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 Sleman is approximately 82%, 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 Sleman

In Sleman 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 Sleman.

Maximum UV Index Levels in Sleman for January

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

Data source: Sleman 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 Sleman Compares to Other Months

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

This table compares monthly weather conditions in Sleman, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	26°C (79°F)	320 mm (12.6 inches)	82%	extreme
February Weather	26°C (79°F)	358 mm (14.1 inches)	86%	extreme
March Weather	26°C (79°F)	330 mm (13.0 inches)	84%	extreme
April Weather	26°C (80°F)	263 mm (10.4 inches)	80%	extreme
May Weather	26°C (80°F)	112 mm (4.4 inches)	81%	extreme
June Weather	25°C (78°F)	99 mm (3.9 inches)	81%	very high
July Weather	24°C (76°F)	25 mm (1.0 inches)	78%	extreme
August Weather	24°C (75°F)	25 mm (1.0 inches)	74%	extreme
September Weather	25°C (76°F)	84 mm (3.3 inches)	70%	extreme
October Weather	25°C (78°F)	162 mm (6.4 inches)	72%	extreme
November Weather	26°C (79°F)	382 mm (15.1 inches)	73%	extreme
December Weather	26°C (79°F)	364 mm (14.3 inches)	75%	extreme