May Weather in Iwaki, Japan

Last updated: August 23, 2025

The average temperature in Iwaki, Japan during May is 16°C (61°F), making it a comfortable time to explore. Daily fluctuations can occur, with a minimum of 9°C (48°F) and a maximum of 23°C (74°F). Be prepared for the possibility of rain, as precipitation amounts to 154 mm (6.1 in) over approximately 12 days. With an average humidity of 80%, it’s wise to embrace the local climate while enjoying your stay!

May Temperature in Iwaki

In May in Iwaki, the average temperature is 16°C (61°F). The maximum can reach 23°C (74°F), and the minimum can be as low as 9°C (48°F). This pleasant climate makes it a great time for outdoor activities and exploring local attractions.

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

The chart illustrates May temperature patterns in Iwaki, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Iwaki, May typically has an average temperature of 16°C (61°F), with highs reaching up to 23°C (74°F) and lows dropping to around 9°C (48°F).

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

May Precipitation in Iwaki

In Iwaki in May, the precipitation amount is 154 mm (6.1 in) over the course of 12 days.

May Precipitation Trends in Iwaki

The chart displays monthly precipitation patterns in Iwaki, 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 Iwaki, May typically receives around 154 mm (6.1 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 Iwaki

In Iwaki in May, humidity is 80%. With an average temperature of 16°C (61°F), this humidity feels like a warm blanket wrapped around you, making sightseeing a sweat-inducing challenge but also lending a lush vibrancy to the surroundings that can enhance your travel experience.

May Average Humidity in Iwaki

This chart illustrates the average monthly humidity levels in Iwaki, 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 Iwaki is approximately 80%, 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 Iwaki

In Iwaki 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 Iwaki.

Maximum UV Index Levels in Iwaki for May

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

Data source: Iwaki 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 Iwaki Compares to Other Months

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

This table compares monthly weather conditions in Iwaki, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (42°F)	57 mm (2.2 inches)	76%	moderate
February Weather	6°C (42°F)	45 mm (1.8 inches)	75%	moderate
March Weather	8°C (47°F)	169 mm (6.6 inches)	72%	high
April Weather	11°C (53°F)	136 mm (5.4 inches)	73%	very high
May Weather	16°C (61°F)	154 mm (6.1 inches)	80%	very high
June Weather	19°C (66°F)	136 mm (5.3 inches)	87%	very high
July Weather	22°C (72°F)	202 mm (8.0 inches)	92%	extreme
August Weather	25°C (76°F)	137 mm (5.4 inches)	90%	extreme
September Weather	22°C (72°F)	186 mm (7.3 inches)	84%	very high
October Weather	18°C (64°F)	271 mm (10.7 inches)	80%	high
November Weather	13°C (55°F)	85 mm (3.4 inches)	77%	moderate
December Weather	8°C (46°F)	73 mm (2.9 inches)	77%	moderate