May Weather in Sai, Japan

Last updated: August 23, 2025

In May, the average temperature in Sai, Japan hovers around 11°C (53°F), with a minimum dipping to 6°C (44°F) and a maximum reaching 18°C (64°F). Expect 103 mm (4.1 in) of precipitation over approximately 11 days, contributing to an average humidity of 86%. Whether you’re braving the rain or enjoying those mild temperatures, it’s a month to dress accordingly!

May Temperature in Sai

In May in Sai, the average temperature is 11°C (53°F). The maximum can reach 18°C (64°F), while the minimum can dip as low as 6°C (44°F). It's a great time to explore Sai with mild temperatures, making outdoor activities enjoyable.

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

The chart illustrates May temperature patterns in Sai, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sai, May typically has an average temperature of 11°C (53°F), with highs reaching up to 18°C (64°F) and lows dropping to around 6°C (44°F).

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

May Precipitation in Sai

In Sai in May, the precipitation amount is 103 mm (4.1 in) spread over 11 days.

May Precipitation Trends in Sai

The chart displays monthly precipitation patterns in Sai, 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 Sai, May typically receives around 103 mm (4.1 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 Sai

In Sai 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 Sai

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

In Sai 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 Sai.

Maximum UV Index Levels in Sai for May

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

Data source: Sai 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 Sai Compares to Other Months

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

This table compares monthly weather conditions in Sai, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	1°C (34°F)	112 mm (4.4 inches)	79%	low
February Weather	1°C (34°F)	117 mm (4.6 inches)	78%	moderate
March Weather	4°C (40°F)	93 mm (3.7 inches)	77%	moderate
April Weather	8°C (46°F)	98 mm (3.9 inches)	78%	very high
May Weather	11°C (53°F)	103 mm (4.1 inches)	86%	very high
June Weather	15°C (59°F)	112 mm (4.4 inches)	91%	very high
July Weather	19°C (67°F)	110 mm (4.3 inches)	95%	very high
August Weather	22°C (72°F)	187 mm (7.4 inches)	97%	extreme
September Weather	21°C (69°F)	132 mm (5.2 inches)	89%	very high
October Weather	16°C (61°F)	156 mm (6.1 inches)	81%	high
November Weather	9°C (49°F)	131 mm (5.1 inches)	78%	moderate
December Weather	3°C (38°F)	167 mm (6.6 inches)	77%	low