December Weather in Mersam, Indonesia

Last updated: August 23, 2025

The average temperature in Mersam, Indonesia during December is 27°C (81°F). Expect a minimum of 23°C (74°F) and a maximum of 34°C (94°F). Be prepared for heavy rainfall, with an average precipitation of 219 mm (8.6 in) over 26 days. The average humidity hovers around a sticky 88%, making it a warm and wet month!

December Temperature in Mersam

In December in Mersam, the average temperature is 27°C (81°F). Maximum temperatures can reach 34°C (94°F), while minimums can drop to as low as 23°C (74°F). This mild climate makes Mersam an ideal destination for travelers seeking a warm getaway.

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

The chart illustrates December temperature patterns in Mersam, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mersam, December typically has an average temperature of 27°C (81°F), with highs reaching up to 34°C (94°F) and lows dropping to around 23°C (74°F).

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

December Precipitation in Mersam

In Mersam in December, the precipitation amount is 219 mm (8.6 in) spread over 26 days.

December Precipitation Trends in Mersam

The chart displays monthly precipitation patterns in Mersam, 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 Mersam, December typically receives around 219 mm (8.6 inches) of precipitation spread over approximately 26 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 Mersam

In Mersam in December, humidity is 88%. With an average temperature of 27°C (81°F), this humidity feels like a warm, thick blanket wrapping around you as you travel, making every step feel more laborious and requiring frequent breaks to cool down and hydrate.

December Average Humidity in Mersam

This chart illustrates the average monthly humidity levels in Mersam, 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 Mersam is approximately 88%, 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 Mersam

In Mersam 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 Mersam, you can check here.

Maximum UV Index Levels in Mersam for December

The chart shows the monthly maximum UV Index (UVI) for Mersam 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 Mersam typically reaches 14, which falls under the extreme exposure category.

Data source: Mersam 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 Mersam Compares to Other Months

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

This table compares monthly weather conditions in Mersam, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	27°C (80°F)	178 mm (7.0 inches)	90%	extreme
February Weather	27°C (81°F)	164 mm (6.4 inches)	88%	extreme
March Weather	27°C (81°F)	282 mm (11.1 inches)	88%	extreme
April Weather	27°C (81°F)	271 mm (10.7 inches)	85%	extreme
May Weather	28°C (82°F)	241 mm (9.5 inches)	85%	extreme
June Weather	27°C (81°F)	165 mm (6.5 inches)	85%	extreme
July Weather	27°C (81°F)	131 mm (5.2 inches)	86%	extreme
August Weather	28°C (82°F)	136 mm (5.4 inches)	88%	extreme
September Weather	28°C (82°F)	173 mm (6.8 inches)	87%	extreme
October Weather	27°C (82°F)	254 mm (10.0 inches)	87%	extreme
November Weather	27°C (81°F)	284 mm (11.2 inches)	86%	extreme
December Weather	27°C (81°F)	219 mm (8.6 inches)	88%	extreme