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May Weather in Isa, Japan

Last updated: August 23, 2025

In May, the average temperature in Isa, Japan is a pleasant 20°C (68°F), with a minimum of 7°C (45°F) and a maximum reaching 30°C (86°F). Expect some rain, as 261 mm (10.3 in) of precipitation typically falls over 13 days. Additionally, the air remains quite humid, boasting an average humidity of 83%.

May Temperature in Isa

In May in Isa, the average temperature is 20°C (68°F). Maximum temperatures can reach 30°C (86°F), while minimums can drop as low as 7°C (45°F). This diverse range of temperatures makes it a great time for travelers to enjoy both warm daylight activities and cooler evenings.

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

The chart illustrates May temperature patterns in Isa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Isa, May typically has an average temperature of 20°C (68°F), with highs reaching up to 30°C (86°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec454654606873808277685748
Data source: Temperature data for Isa generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Isa

In Isa in May, the precipitation amount is 261 mm (10.3 in) over the course of 13 days.

May Precipitation Trends in Isa

The chart displays monthly precipitation patterns in Isa, 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 Isa, May typically receives around 261 mm (10.3 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec6111016215926138648323425914110294
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Isa

In Isa in May humidity is 83%. With an average temperature of 20°C (68°F), this humidity feels like a warm, heavy blanket enveloping you, making it feel much warmer than it is. Traveling in such conditions can be quite taxing, as the air feels thick, often leading to a sense of exhaustion and requiring frequent breaks to seek shade or hydration.

May Average Humidity in Isa

This chart illustrates the average monthly humidity levels in Isa, 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 Isa is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec72%68%72%79%83%86%90%85%80%78%76%75%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Isa

In Isa in May, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in Isa.

Maximum UV Index Levels in Isa for May

The chart shows the monthly maximum UV Index (UVI) for Isa 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 Isa typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec569111212121311864
Data source: Isa 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 Isa Compares to Other Months

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

This table compares monthly weather conditions in Isa, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (45°F)61 mm (2.4 inches)72%moderate
February Weather8°C (47°F)110 mm (4.3 inches)68%high
March Weather12°C (54°F)162 mm (6.4 inches)72%very high
April Weather16°C (61°F)159 mm (6.3 inches)79%extreme
May Weather20°C (68°F)261 mm (10.3 inches)83%extreme
June Weather23°C (74°F)386 mm (15.2 inches)86%extreme
July Weather26°C (80°F)483 mm (19.0 inches)90%extreme
August Weather28°C (82°F)234 mm (9.2 inches)85%extreme
September Weather25°C (77°F)259 mm (10.2 inches)80%extreme
October Weather20°C (69°F)141 mm (5.6 inches)78%very high
November Weather14°C (57°F)102 mm (4.0 inches)76%high
December Weather9°C (48°F)94 mm (3.7 inches)74%moderate

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