May Weather in Iwamizawa, Japan

Last updated: August 23, 2025

In May, the average temperature in Iwamizawa, Japan is a mild 13°C (55°F), with a minimum dipping to 2°C (35°F) and a maximum soaring to 30°C (86°F). Expect around 89 mm (3.5 in) of precipitation spread over 12 days, contributing to an overall humidity level of 86%. This combination of temperature and moisture makes for a unique and vibrant climate experience!

May Temperature in Iwamizawa

In May in Iwamizawa, the average temperature is 13°C (55°F). Maximums can reach 30°C (86°F), and minimums can be as low as 2°C (35°F). This climate makes it an ideal time for travelers to enjoy outdoor activities while being prepared for varying temperatures.

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

The chart illustrates May temperature patterns in Iwamizawa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Iwamizawa, May typically has an average temperature of 13°C (55°F), with highs reaching up to 30°C (86°F) and lows dropping to around 2°C (35°F).

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

May Precipitation in Iwamizawa

In Iwamizawa in May, the precipitation amount is 89 mm (3.5 in) during 12 days of rainfall.

May Precipitation Trends in Iwamizawa

The chart displays monthly precipitation patterns in Iwamizawa, 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 Iwamizawa, May typically receives around 89 mm (3.5 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 Iwamizawa

In Iwamizawa in May humidity is 86%. With an average temperature of 13°C (55°F), this humidity feels like a damp blanket clinging to your skin, making travel quite uncomfortable and urging you to seek cooler, dryer spots.

May Average Humidity in Iwamizawa

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

In Iwamizawa in May, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Iwamizawa.

Maximum UV Index Levels in Iwamizawa for May

The chart shows the monthly maximum UV Index (UVI) for Iwamizawa 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 Iwamizawa typically reaches 8, which falls under the very high exposure category.

Data source: Iwamizawa 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 Iwamizawa Compares to Other Months

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

This table compares monthly weather conditions in Iwamizawa, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (21°F)	48 mm (1.9 inches)	84%	low
February Weather	-5°C (24°F)	61 mm (2.4 inches)	83%	moderate
March Weather	1°C (34°F)	75 mm (2.9 inches)	81%	high
April Weather	7°C (44°F)	72 mm (2.8 inches)	81%	high
May Weather	13°C (55°F)	89 mm (3.5 inches)	86%	very high
June Weather	16°C (61°F)	91 mm (3.6 inches)	87%	very high
July Weather	20°C (69°F)	84 mm (3.3 inches)	93%	very high
August Weather	21°C (70°F)	164 mm (6.5 inches)	95%	very high
September Weather	18°C (64°F)	85 mm (3.3 inches)	88%	very high
October Weather	11°C (53°F)	120 mm (4.7 inches)	83%	moderate
November Weather	5°C (41°F)	115 mm (4.5 inches)	79%	moderate
December Weather	-3°C (27°F)	84 mm (3.3 inches)	80%	low