May Weather in Hachijo, Japan

Last updated: August 23, 2025

In Hachijo, Japan, the average temperature in May hovers around 21°C (70°F). Expect a minimum temperature of 16°C (61°F) and a maximum of 25°C (78°F). With an average precipitation of 184 mm (7.3 in) spread over 12 days, it’s wise to carry an umbrella. The month also boasts an average humidity level of 82%, making for a delightful yet brisk climate.

May Temperature in Hachijo

In May in Hachijo, the average temperature is 21°C (70°F). Maximum temperatures can reach 25°C (78°F), while minimums can drop to as low as 16°C (61°F). This pleasant climate makes it an ideal time for travelers to explore and enjoy outdoor activities in Hachijo.

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

The chart illustrates May 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, May typically has an average temperature of 21°C (70°F), with highs reaching up to 25°C (78°F) and lows dropping to around 16°C (61°F).

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

May Precipitation in Hachijo

In Hachijo in May, the precipitation amount is 184 mm (7.3 in) spread over 12 days.

May Precipitation Trends in Hachijo

The chart displays monthly precipitation patterns in Hachijo, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Hachijo, May typically receives around 184 mm (7.3 inches) of precipitation spread over approximately 12 days.

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

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Millimeters (mm) Inches (in)

May Humidity in Hachijo

In Hachijo in May, humidity is 82%. With an average temperature of 21°C (70°F), this humidity feels like a warm, sticky embrace that can quickly lead to discomfort for travelers, making outdoor activities less enjoyable and requiring frequent breaks for hydration.

May Average Humidity in Hachijo

This chart illustrates the average monthly humidity levels in Hachijo, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Hachijo is approximately 82%, offering insight into how humid the weather typically is during this month.

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

May UV Index in Hachijo

In Hachijo in May, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Hachijo.

Maximum UV Index Levels in Hachijo for May

The chart shows the monthly maximum UV Index (UVI) for Hachijo in May, 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 May, the maximum UV index in Hachijo typically reaches 11, which falls under the extreme exposure category.

Data source: Hachijo May 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 May 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 May’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 May’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