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December Weather in Pematangsiantar, Indonesia

Last updated: August 23, 2025

In December, the average temperature in Pematangsiantar, Indonesia hovers around 24°C (76°F), with lows dipping to 20°C (69°F) and highs reaching up to 31°C (87°F). However, be prepared for some wet days, as precipitation averages 322 mm (12.7 in) spread over 29 days, and the humidity is quite high at 88%.

December Temperature in Pematangsiantar

In December in Pematangsiantar, the average temperature is 24°C (76°F). The maximum can reach 31°C (87°F) and the minimum can be as low as 20°C (69°F). This makes it a perfect destination for comfortable outdoor activities and exploration.

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

The chart illustrates December temperature patterns in Pematangsiantar, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Pematangsiantar, December typically has an average temperature of 24°C (76°F), with highs reaching up to 31°C (87°F) and lows dropping to around 20°C (69°F).
JanFebMarAprMayJunJulAugSepOctNovDec757676777777777676767675
Data source: Temperature data for Pematangsiantar 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 Pematangsiantar

In Pematangsiantar in December, the total precipitation amount recorded is 322 mm (12.7 in) over the course of 29 days.

December Precipitation Trends in Pematangsiantar

The chart displays monthly precipitation patterns in Pematangsiantar, 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 Pematangsiantar, December typically receives around 322 mm (12.7 inches) of precipitation spread over approximately 29 days.
JanFebMarAprMayJunJulAugSepOctNovDec210176185230344281224251379339407322
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Pematangsiantar

In Pematangsiantar in December humidity is 88%. With an average temperature of 24°C (76°F), this humidity feels like a warm, heavy blanket enveloping you, making travel feel like a gentle swim through the air, where every step is accompanied by a comforting yet slightly oppressive warmth.

December Average Humidity in Pematangsiantar

This chart illustrates the average monthly humidity levels in Pematangsiantar, 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 Pematangsiantar is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%74%74%77%83%85%84%87%89%89%88%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Pematangsiantar

In Pematangsiantar in December, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in Pematangsiantar.

Maximum UV Index Levels in Pematangsiantar for December

The chart shows the monthly maximum UV Index (UVI) for Pematangsiantar 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 Pematangsiantar typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec131516151512131415151412
Data source: Pematangsiantar 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 Pematangsiantar Compares to Other Months

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

This table compares monthly weather conditions in Pematangsiantar, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather24°C (76°F)210 mm (8.3 inches)83%extreme
February Weather24°C (76°F)176 mm (6.9 inches)74%extreme
March Weather25°C (77°F)185 mm (7.3 inches)74%extreme
April Weather25°C (77°F)230 mm (9.0 inches)77%extreme
May Weather25°C (78°F)344 mm (13.6 inches)82%extreme
June Weather25°C (77°F)281 mm (11.1 inches)85%extreme
July Weather25°C (77°F)224 mm (8.8 inches)84%extreme
August Weather25°C (77°F)251 mm (9.9 inches)87%extreme
September Weather24°C (76°F)379 mm (14.9 inches)89%extreme
October Weather24°C (76°F)339 mm (13.3 inches)89%extreme
November Weather24°C (76°F)407 mm (16.0 inches)88%extreme
December Weather24°C (76°F)322 mm (12.7 inches)88%extreme

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