May Weather in Onna, Japan

Last updated: August 23, 2025

In Onna, Japan, the average temperature in May hovers around 24°C (75°F), with a minimum of 19°C (66°F) and a maximum reaching 28°C (82°F). Expect a substantial precipitation of 213 mm (8.4 in) over approximately 12 days, accompanied by high humidity levels at 84%, creating a lush and vibrant atmosphere.

May Temperature in Onna

In May in Onna, the average temperature is 24°C (75°F). The maximum can reach 28°C (82°F), and the minimum can be as low as 19°C (66°F). This pleasant climate makes Onna an ideal destination for travelers looking to enjoy mild and comfortable weather.

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

The chart illustrates May temperature patterns in Onna, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Onna, May typically has an average temperature of 24°C (75°F), with highs reaching up to 28°C (82°F) and lows dropping to around 19°C (66°F).

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

May Precipitation in Onna

In Onna in May, the total precipitation amount is 213 mm (8.4 in) over the course of 12 days.

May Precipitation Trends in Onna

The chart displays monthly precipitation patterns in Onna, 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 Onna, May typically receives around 213 mm (8.4 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 Onna

In Onna in May humidity is 84%. With an average temperature of 24°C (75°F), this humidity feels like a warm, tropical embrace, making it essential for travelers to stay hydrated and plan outdoor activities for early mornings or late afternoons when the heat is more bearable.

May Average Humidity in Onna

This chart illustrates the average monthly humidity levels in Onna, 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 Onna is approximately 84%, 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 Onna

In Onna in May, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in Onna.

Maximum UV Index Levels in Onna for May

The chart shows the monthly maximum UV Index (UVI) for Onna 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 Onna typically reaches 13, which falls under the extreme exposure category.

Data source: Onna 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 Onna Compares to Other Months

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

This table compares monthly weather conditions in Onna, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	18°C (65°F)	99 mm (3.9 inches)	71%	high
February Weather	18°C (65°F)	98 mm (3.9 inches)	71%	very high
March Weather	20°C (68°F)	109 mm (4.3 inches)	76%	extreme
April Weather	21°C (70°F)	146 mm (5.7 inches)	82%	extreme
May Weather	24°C (75°F)	213 mm (8.4 inches)	84%	extreme
June Weather	26°C (80°F)	328 mm (12.9 inches)	86%	extreme
July Weather	28°C (83°F)	180 mm (7.1 inches)	86%	extreme
August Weather	28°C (83°F)	187 mm (7.4 inches)	82%	extreme
September Weather	28°C (82°F)	237 mm (9.3 inches)	82%	extreme
October Weather	26°C (78°F)	149 mm (5.8 inches)	80%	very high
November Weather	23°C (74°F)	106 mm (4.2 inches)	79%	very high
December Weather	20°C (68°F)	162 mm (6.4 inches)	75%	high