January Weather in Hachijo, Japan

Last updated: August 23, 2025

In January, the average temperature in Hachijo, Japan hovers around 13°C (56°F), with a pleasant range between a minimum of 6°C (44°F) and a maximum of 20°C (69°F). Expect around 130 mm (5.1 in) of precipitation spread over 16 days, contributing to an average humidity level of 69%. Embrace the mild and often damp atmosphere that characterizes this month!

January Temperature in Hachijo

In January in Hachijo, the average temperature is 13°C (56°F). Maximums can reach 20°C (69°F), while minimums can dip as low as 6°C (44°F). This mild climate makes Hachijo an ideal destination for travelers seeking a comfortable environment to explore.

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

The chart illustrates January 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, January typically has an average temperature of 13°C (56°F), with highs reaching up to 20°C (69°F) and lows dropping to around 6°C (44°F).

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

January Precipitation in Hachijo

In Hachijo in January, the precipitation amount is 130 mm (5.1 in) spread over 16 days.

January Precipitation Trends in Hachijo

The chart displays monthly precipitation patterns in Hachijo, 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 Hachijo, January typically receives around 130 mm (5.1 inches) of precipitation spread over approximately 16 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in Hachijo

In Hachijo in January humidity is 69%. With an average temperature of 13°C (56°F), this humidity feels like a cool and damp embrace, which might make traveling somewhat uncomfortable as the air weighs down on you, adding to the chill and making your clothes cling.

January Average Humidity in Hachijo

This chart illustrates the average monthly humidity levels in Hachijo, 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 Hachijo is approximately 69%, 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 Hachijo

In Hachijo in January, 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 January

The chart shows the monthly maximum UV Index (UVI) for Hachijo 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 Hachijo typically reaches 4, which falls under the moderate exposure category.

Data source: Hachijo 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 Hachijo Compares to Other Months

Weather in Hachijo varies notably across the year, with each month offering distinct climate conditions. This page compares January’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 January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	13°C (56°F)	130 mm (5.1 inches)	69%	moderate
February Weather	13°C (56°F)	114 mm (4.5 inches)	68%	high
March Weather	15°C (60°F)	201 mm (7.9 inches)	69%	very high
April Weather	18°C (64°F)	133 mm (5.2 inches)	75%	extreme
May Weather	21°C (70°F)	184 mm (7.3 inches)	82%	extreme
June Weather	23°C (74°F)	338 mm (13.3 inches)	88%	extreme
July Weather	26°C (80°F)	170 mm (6.7 inches)	92%	extreme
August Weather	28°C (82°F)	83 mm (3.3 inches)	85%	extreme
September Weather	27°C (80°F)	311 mm (12.3 inches)	82%	very high
October Weather	24°C (75°F)	334 mm (13.1 inches)	78%	high
November Weather	20°C (68°F)	154 mm (6.1 inches)	74%	high
December Weather	16°C (61°F)	133 mm (5.2 inches)	72%	moderate