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December Weather in Hachijo, Japan

Last updated: August 23, 2025

In Hachijo, Japan, the average temperature in December hovers around 16°C (61°F), with a pleasant range where the minimum dips to 8°C (47°F) and the maximum peaks at 23°C (74°F). Expect about 133 mm (5.2 in) of precipitation spread over 17 days, contributing to an average humidity level of 72%. Enjoy the balance of mild temperatures and refreshing weather!

December Temperature in Hachijo

In December in Hachijo, the average temperature is 16°C (61°F). Maximum temperatures can reach 23°C (74°F), while minimums can drop to as low as 8°C (47°F). This mild climate makes Hachijo a pleasant destination for travelers looking to explore comfortably.

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

The chart illustrates December temperature patterns in Hachijo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hachijo, December typically has an average temperature of 16°C (61°F), with highs reaching up to 23°C (74°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec565560647074808280746861
Data source: Temperature data for Hachijo 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 Hachijo

In Hachijo in December, the precipitation amount is 133 mm (5.2 in) over the span of 17 days.

December Precipitation Trends in Hachijo

The chart displays monthly precipitation patterns in Hachijo, 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 Hachijo, December typically receives around 133 mm (5.2 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec13111420113318433817083311334154133
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Hachijo

In Hachijo in December humidity is 72%. With an average temperature of 16°C (61°F), this humidity feels like a damp blanket wrapping around you, making every step feel heavier and requiring extra effort while traveling.

December Average Humidity in Hachijo

This chart illustrates the average monthly humidity levels in Hachijo, 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 Hachijo is approximately 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec69%68%69%75%82%88%92%85%82%78%74%72%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Hachijo

In Hachijo in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Hachijo for better planning.

Maximum UV Index Levels in Hachijo for December

The chart shows the monthly maximum UV Index (UVI) for Hachijo 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 Hachijo typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469111112121110764
Data source: Hachijo 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 Hachijo Compares to Other Months

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

This table compares monthly weather conditions in Hachijo, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather13°C (56°F)130 mm (5.1 inches)69%moderate
February Weather13°C (56°F)114 mm (4.5 inches)68%high
March Weather15°C (60°F)201 mm (7.9 inches)69%very high
April Weather18°C (64°F)133 mm (5.2 inches)75%extreme
May Weather21°C (70°F)184 mm (7.3 inches)82%extreme
June Weather23°C (74°F)338 mm (13.3 inches)88%extreme
July Weather26°C (80°F)170 mm (6.7 inches)92%extreme
August Weather28°C (82°F)83 mm (3.3 inches)85%extreme
September Weather27°C (80°F)311 mm (12.3 inches)82%very high
October Weather24°C (75°F)334 mm (13.1 inches)78%high
November Weather20°C (68°F)154 mm (6.1 inches)74%high
December Weather16°C (61°F)133 mm (5.2 inches)72%moderate

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