December Weather in Mersak, Indonesia

Last updated: August 23, 2025

In December, the average temperature in Mersak, Indonesia is a pleasant 19°C (66°F), with a minimum of 14°C (57°F) and a maximum reaching 26°C (79°F). Expect significant precipitation, totaling 559 mm (22.0 in) over 29 days, while the humidity hovers around 81%. Be prepared for a mix of warm weather and lush, rain-soaked landscapes!

December Temperature in Mersak

In December in Mersak, the average temperature is 19°C (66°F), with maximums reaching up to 26°C (79°F) and minimums dropping as low as 14°C (57°F). This makes it an ideal time for travelers to enjoy mild weather and outdoor activities in Mersak.

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

The chart illustrates December temperature patterns in Mersak, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mersak, December typically has an average temperature of 19°C (66°F), with highs reaching up to 26°C (79°F) and lows dropping to around 14°C (57°F).

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

December Precipitation in Mersak

In Mersak in December, the total precipitation amount is 559 mm (22.0 in) over the course of 29 days.

December Precipitation Trends in Mersak

The chart displays monthly precipitation patterns in Mersak, 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 Mersak, December typically receives around 559 mm (22.0 inches) of precipitation spread over approximately 29 days.

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

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Millimeters (mm) Inches (in)

December Humidity in Mersak

In Mersak in December, humidity is 81%. With an average temperature of 19°C (66°F), this humidity feels like a warm, heavy blanket enveloping you, making travel feel both muggy and slightly stifling, often leading to a need for frequent breaks in the shade.

December Average Humidity in Mersak

This chart illustrates the average monthly humidity levels in Mersak, 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 Mersak is approximately 81%, offering insight into how humid the weather typically is during this month.

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

December UV Index in Mersak

In Mersak in December, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in Mersak.

Maximum UV Index Levels in Mersak for December

The chart shows the monthly maximum UV Index (UVI) for Mersak 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 Mersak typically reaches 13, which falls under the extreme exposure category.

Data source: Mersak 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 Mersak Compares to Other Months

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

This table compares monthly weather conditions in Mersak, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	18°C (66°F)	318 mm (12.5 inches)	79%	extreme
February Weather	19°C (66°F)	292 mm (11.5 inches)	73%	extreme
March Weather	19°C (66°F)	445 mm (17.5 inches)	74%	extreme
April Weather	19°C (66°F)	557 mm (21.9 inches)	73%	extreme
May Weather	19°C (67°F)	502 mm (19.8 inches)	77%	extreme
June Weather	19°C (66°F)	297 mm (11.7 inches)	79%	extreme
July Weather	19°C (66°F)	296 mm (11.7 inches)	77%	extreme
August Weather	19°C (66°F)	327 mm (12.9 inches)	81%	extreme
September Weather	18°C (65°F)	456 mm (18.0 inches)	84%	extreme
October Weather	18°C (65°F)	463 mm (18.2 inches)	85%	extreme
November Weather	18°C (65°F)	569 mm (22.4 inches)	83%	extreme
December Weather	19°C (66°F)	559 mm (22.0 inches)	81%	extreme