May Weather in Iwanai, Japan

Last updated: August 23, 2025

The average temperature in Iwanai, Japan during May hovers around 11°C (53°F). Expect a minimum chill of 3°C (38°F) and a maximum warmth reaching 26°C (79°F). With an average precipitation of 86 mm (3.4 in) spread over 12 days, and a high humidity level of 86%, it’s a month where you might want to keep an umbrella handy while embracing the mild temperatures!

May Temperature in Iwanai

In May in Iwanai, the average temperature is 11°C (53°F). The maximum can reach 26°C (79°F) while the minimum can dip as low as 3°C (38°F). Travelers should be prepared for varying temperatures and pack accordingly to enjoy their stay comfortably.

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

The chart illustrates May temperature patterns in Iwanai, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Iwanai, May typically has an average temperature of 11°C (53°F), with highs reaching up to 26°C (79°F) and lows dropping to around 3°C (38°F).

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

May Precipitation in Iwanai

In Iwanai in May, the precipitation amount is 86 mm (3.4 in) over a span of 12 days.

May Precipitation Trends in Iwanai

The chart displays monthly precipitation patterns in Iwanai, 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 Iwanai, May typically receives around 86 mm (3.4 inches) of precipitation spread over approximately 12 days.

Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

May Humidity in Iwanai

In Iwanai in May, humidity is 86%. With an average temperature of 11°C (53°F), this humidity feels like a heavy blanket that dampens the air, making traveling uncomfortable and a bit stifling.

May Average Humidity in Iwanai

This chart illustrates the average monthly humidity levels in Iwanai, 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 Iwanai is approximately 86%, 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 Iwanai

In Iwanai in May, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Iwanai.

Maximum UV Index Levels in Iwanai for May

The chart shows the monthly maximum UV Index (UVI) for Iwanai 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 Iwanai typically reaches 9, which falls under the very high exposure category.

Data source: Iwanai 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 Iwanai Compares to Other Months

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

This table compares monthly weather conditions in Iwanai, 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 (25°F)	99 mm (3.9 inches)	84%	low
February Weather	-3°C (26°F)	103 mm (4.1 inches)	83%	moderate
March Weather	1°C (34°F)	98 mm (3.8 inches)	81%	moderate
April Weather	5°C (41°F)	88 mm (3.4 inches)	81%	high
May Weather	11°C (53°F)	86 mm (3.4 inches)	86%	very high
June Weather	15°C (59°F)	109 mm (4.3 inches)	87%	very high
July Weather	20°C (68°F)	94 mm (3.7 inches)	93%	very high
August Weather	21°C (70°F)	145 mm (5.7 inches)	95%	very high
September Weather	18°C (64°F)	126 mm (5.0 inches)	88%	very high
October Weather	12°C (53°F)	149 mm (5.9 inches)	83%	moderate
November Weather	5°C (41°F)	176 mm (6.9 inches)	79%	moderate
December Weather	-2°C (29°F)	159 mm (6.3 inches)	80%	low