May Weather in Katsuyama, Japan

Last updated: August 23, 2025

In May, the average temperature in Katsuyama, Japan hovers around 15°C (59°F). Expect a range where minimums can drop to 0°C (33°F) and maximums soar to 27°C (82°F). During this time, rainfall totals about 201 mm (7.9 in) spread over 14 days, contributing to a notably high average humidity of 83%.

May Temperature in Katsuyama

In May in Katsuyama, the average temperature is 15°C (59°F). Maximums can reach 27°C (82°F), while minimums can drop as low as 0°C (33°F). It's a great time to visit for those who enjoy mild weather with the possibility of warmer days and cool nights.

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

The chart illustrates May temperature patterns in Katsuyama, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Katsuyama, May typically has an average temperature of 15°C (59°F), with highs reaching up to 27°C (82°F) and lows dropping to around 0°C (33°F).

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

May Precipitation in Katsuyama

In Katsuyama in May, the precipitation amount is 201 mm (7.9 in) over a span of 14 days.

May Precipitation Trends in Katsuyama

The chart displays monthly precipitation patterns in Katsuyama, 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 Katsuyama, May typically receives around 201 mm (7.9 inches) of precipitation spread over approximately 14 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 Katsuyama

In Katsuyama in May humidity is 83%. With an average temperature of 15°C (59°F), this humidity feels like a cozy, damp embrace that can be quite stifling for traveling, making even short walks feel more exhausting than they should, and prompting a need for frequent breaks in shaded or air-conditioned areas.

May Average Humidity in Katsuyama

This chart illustrates the average monthly humidity levels in Katsuyama, 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 Katsuyama 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 Katsuyama

In Katsuyama 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 Katsuyama.

Maximum UV Index Levels in Katsuyama for May

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

Data source: Katsuyama 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 Katsuyama Compares to Other Months

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

This table compares monthly weather conditions in Katsuyama, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-1°C (30°F)	165 mm (6.5 inches)	82%	moderate
February Weather	-1°C (31°F)	167 mm (6.6 inches)	79%	high
March Weather	4°C (40°F)	191 mm (7.5 inches)	74%	very high
April Weather	9°C (49°F)	216 mm (8.5 inches)	76%	very high
May Weather	15°C (59°F)	201 mm (7.9 inches)	83%	extreme
June Weather	18°C (65°F)	226 mm (8.9 inches)	87%	extreme
July Weather	23°C (73°F)	436 mm (17.2 inches)	93%	extreme
August Weather	24°C (76°F)	304 mm (12.0 inches)	91%	extreme
September Weather	20°C (68°F)	244 mm (9.6 inches)	87%	very high
October Weather	14°C (58°F)	230 mm (9.1 inches)	85%	high
November Weather	8°C (46°F)	127 mm (5.0 inches)	83%	moderate
December Weather	2°C (36°F)	195 mm (7.7 inches)	83%	moderate