May Weather in Iruma, Japan

Last updated: August 23, 2025

In May, the average temperature in Iruma, Japan hovers around 17°C (64°F). Expect a range that can dip as low as 4°C (39°F) and soar up to 30°C (86°F). With 148 mm (5.8 in) of precipitation spread over 15 days, you may want to keep an umbrella handy. The air tends to be quite humid, with an average humidity level of 81%.

May Temperature in Iruma

In May in Iruma, the average temperature is 17°C (64°F). Maximums can reach 30°C (86°F), while minimums can be as low as 4°C (39°F). This mild climate makes Iruma an excellent destination for travelers seeking pleasant weather.

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

The chart illustrates May temperature patterns in Iruma, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Iruma, May typically has an average temperature of 17°C (64°F), with highs reaching up to 30°C (86°F) and lows dropping to around 4°C (39°F).

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

May Precipitation in Iruma

In Iruma, in May, the precipitation amount is 148 mm (5.8 in) over a span of 15 days.

May Precipitation Trends in Iruma

The chart displays monthly precipitation patterns in Iruma, 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 Iruma, May typically receives around 148 mm (5.8 inches) of precipitation spread over approximately 15 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 Iruma

In Iruma in May, humidity is 81%. With an average temperature of 17°C (64°F), this humidity feels like walking through a warm mist, enveloping you in a sticky embrace that can quickly lead to discomfort during long sightseeing excursions.

May Average Humidity in Iruma

This chart illustrates the average monthly humidity levels in Iruma, 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 Iruma is approximately 81%, 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 Iruma

In Iruma 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 Iruma.

Maximum UV Index Levels in Iruma for May

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

Data source: Iruma 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 Iruma Compares to Other Months

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

This table compares monthly weather conditions in Iruma, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	3°C (37°F)	53 mm (2.1 inches)	76%	moderate
February Weather	4°C (40°F)	62 mm (2.4 inches)	74%	high
March Weather	8°C (47°F)	166 mm (6.5 inches)	70%	very high
April Weather	12°C (54°F)	150 mm (5.9 inches)	74%	very high
May Weather	17°C (64°F)	148 mm (5.8 inches)	81%	extreme
June Weather	20°C (69°F)	209 mm (8.2 inches)	88%	extreme
July Weather	24°C (76°F)	312 mm (12.3 inches)	93%	extreme
August Weather	26°C (79°F)	195 mm (7.7 inches)	90%	extreme
September Weather	22°C (71°F)	247 mm (9.7 inches)	86%	very high
October Weather	16°C (61°F)	346 mm (13.6 inches)	83%	high
November Weather	11°C (52°F)	72 mm (2.8 inches)	80%	moderate
December Weather	5°C (42°F)	62 mm (2.4 inches)	78%	moderate