May Weather in Rumoi, Japan

Last updated: August 23, 2025

In Rumoi, Japan, the average temperature in May hovers around 11°C (52°F). Expect minimums dipping to 3°C (38°F) and maximums reaching up to 27°C (80°F). This month typically brings 89 mm (3.5 in) of precipitation over 11 days, accompanied by a high average humidity of 86%.

May Temperature in Rumoi

In May in Rumoi, the average temperature is 11°C (52°F). The maximum can reach 27°C (80°F), while the minimum can drop as low as 3°C (38°F). It's a great time for travelers to enjoy mild weather, so pack layers to be prepared for both warm afternoons and cooler evenings.

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

The chart illustrates May temperature patterns in Rumoi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rumoi, May typically has an average temperature of 11°C (52°F), with highs reaching up to 27°C (80°F) and lows dropping to around 3°C (38°F).

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

May Precipitation in Rumoi

In Rumoi in May, the precipitation amount is 89 mm (3.5 in) over a span of 11 days.

May Precipitation Trends in Rumoi

The chart displays monthly precipitation patterns in Rumoi, 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 Rumoi, May typically receives around 89 mm (3.5 inches) of precipitation spread over approximately 11 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 Rumoi

In Rumoi in May humidity is 86%. With an average temperature of 11°C (52°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities less enjoyable and prompting travelers to seek sheltered spots or indoor attractions to escape the uncomfortable dampness.

May Average Humidity in Rumoi

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

In Rumoi 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 Rumoi.

Maximum UV Index Levels in Rumoi for May

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

Data source: Rumoi 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 Rumoi Compares to Other Months

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

This table compares monthly weather conditions in Rumoi, 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 (22°F)	70 mm (2.8 inches)	84%	low
February Weather	-4°C (24°F)	84 mm (3.3 inches)	83%	moderate
March Weather	0°C (33°F)	84 mm (3.3 inches)	81%	moderate
April Weather	6°C (42°F)	67 mm (2.6 inches)	81%	high
May Weather	11°C (52°F)	89 mm (3.5 inches)	86%	very high
June Weather	15°C (59°F)	94 mm (3.7 inches)	87%	very high
July Weather	21°C (69°F)	103 mm (4.0 inches)	93%	very high
August Weather	21°C (70°F)	171 mm (6.7 inches)	95%	very high
September Weather	18°C (64°F)	90 mm (3.6 inches)	88%	very high
October Weather	12°C (53°F)	147 mm (5.8 inches)	83%	moderate
November Weather	5°C (41°F)	152 mm (6.0 inches)	79%	moderate
December Weather	-2°C (28°F)	132 mm (5.2 inches)	80%	low