May Weather in Koya, Japan

Last updated: August 23, 2025

In Koya, Japan, the average temperature in May hovers around 19°C (66°F), making it a pleasant time to explore. Expect a minimum of 4°C (39°F) and a maximum of 30°C (86°F), offering a nice range for outdoor activities. However, be prepared for precipitation; you can anticipate about 169 mm (6.7 in) over 11 days. With an average humidity of 83%, the air will feel quite refreshing. Enjoy your time!

May Temperature in Koya

In May in Koya, the average temperature is 19°C (66°F). Maximums can reach 30°C (86°F), and minimums can be as low as 4°C (39°F). This weather makes Koya an ideal destination for travelers seeking a pleasant climate and comfortable outdoor activities.

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

The chart illustrates May temperature patterns in Koya, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Koya, May typically has an average temperature of 19°C (66°F), with highs reaching up to 30°C (86°F) and lows dropping to around 4°C (39°F).

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

May Precipitation in Koya

In Koya in May, the total precipitation amount is 169 mm (6.7 in) over the course of 11 days.

May Precipitation Trends in Koya

The chart displays monthly precipitation patterns in Koya, 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 Koya, May typically receives around 169 mm (6.7 inches) of precipitation spread over approximately 11 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 Koya

In Koya in May, humidity is 83%. With an average temperature of 19°C (66°F), this humidity feels like a heavy blanket wrapping around you, making travel feel more sluggish and muggy, yet there's a refreshing coolness in the air that invites you to explore.

May Average Humidity in Koya

This chart illustrates the average monthly humidity levels in Koya, 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 Koya is approximately 83%, 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 Koya

In Koya 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 Koya.

Maximum UV Index Levels in Koya for May

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

Data source: Koya 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 Koya Compares to Other Months

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

This table compares monthly weather conditions in Koya, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (40°F)	67 mm (2.6 inches)	82%	moderate
February Weather	5°C (41°F)	83 mm (3.3 inches)	79%	high
March Weather	9°C (49°F)	127 mm (5.0 inches)	74%	very high
April Weather	14°C (57°F)	132 mm (5.2 inches)	76%	extreme
May Weather	19°C (66°F)	169 mm (6.7 inches)	83%	extreme
June Weather	22°C (72°F)	220 mm (8.7 inches)	87%	extreme
July Weather	26°C (79°F)	324 mm (12.7 inches)	93%	extreme
August Weather	28°C (82°F)	203 mm (8.0 inches)	91%	extreme
September Weather	24°C (75°F)	204 mm (8.0 inches)	87%	very high
October Weather	18°C (65°F)	265 mm (10.5 inches)	85%	high
November Weather	12°C (54°F)	62 mm (2.4 inches)	83%	high
December Weather	7°C (44°F)	79 mm (3.1 inches)	83%	moderate