May Weather in Iwai, Japan

Last updated: August 23, 2025

The average temperature in Iwai, Japan during May is 19°C (67°F), with a minimum of 6°C (42°F) and a maximum of 33°C (91°F). Expect 121 mm (4.8 in) of precipitation over 12 days, paired with an average humidity of 81%. Enjoy the varied climate of this vibrant destination!

May Temperature in Iwai

In May in Iwai, the average temperature is 19°C (67°F). The maximum can reach 33°C (91°F), and the minimum can be as low as 6°C (42°F). This makes it an ideal time for travelers to enjoy a mix of pleasant warmth and cool evenings.

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

The chart illustrates May temperature patterns in Iwai, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Iwai, May typically has an average temperature of 19°C (67°F), with highs reaching up to 33°C (91°F) and lows dropping to around 6°C (42°F).

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

May Precipitation in Iwai

In Iwai in May, the precipitation amount reaches 121 mm (4.8 in) over the course of 12 days.

May Precipitation Trends in Iwai

The chart displays monthly precipitation patterns in Iwai, 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 Iwai, May typically receives around 121 mm (4.8 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 Iwai

In Iwai in May humidity is 81%. With an average temperature of 19°C (67°F), this humidity feels like a heavy blanket enveloping you, making travel somewhat uncomfortable as sweat clings to your skin and the air feels thick, prompting you to seek shade and hydration frequently.

May Average Humidity in Iwai

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

In Iwai in May, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Iwai.

Maximum UV Index Levels in Iwai for May

The chart shows the monthly maximum UV Index (UVI) for Iwai 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 Iwai typically reaches 10, which falls under the very high exposure category.

Data source: Iwai 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 Iwai Compares to Other Months

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

This table compares monthly weather conditions in Iwai, 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)	42 mm (1.6 inches)	76%	moderate
February Weather	6°C (42°F)	39 mm (1.5 inches)	74%	moderate
March Weather	10°C (50°F)	123 mm (4.9 inches)	70%	high
April Weather	14°C (58°F)	109 mm (4.3 inches)	74%	very high
May Weather	19°C (67°F)	121 mm (4.8 inches)	81%	very high
June Weather	22°C (72°F)	142 mm (5.6 inches)	88%	extreme
July Weather	26°C (79°F)	225 mm (8.9 inches)	93%	extreme
August Weather	28°C (82°F)	111 mm (4.4 inches)	90%	very high
September Weather	24°C (75°F)	171 mm (6.7 inches)	86%	very high
October Weather	18°C (65°F)	238 mm (9.4 inches)	83%	high
November Weather	13°C (55°F)	72 mm (2.8 inches)	80%	moderate
December Weather	7°C (44°F)	54 mm (2.1 inches)	78%	moderate