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May Weather in Joetsu, Japan

Last updated: August 23, 2025

In May, the average temperature in Joetsu, Japan is a pleasant 17°C (64°F), with temperatures ranging from a cool 8°C (46°F) to a warm 29°C (85°F). Expect about 105 mm (4.1 in) of precipitation over 13 days, contributing to an average humidity of 81%. Whether you're basking in the sun or dodging the rain, pack accordingly!

May Temperature in Joetsu

In May in Joetsu, the average temperature is 17°C (64°F). Maximums can reach 29°C (85°F) and minimums can drop as low as 8°C (46°F). This moderate climate makes it an ideal time for traveling, as you can enjoy comfortable outdoor activities and sightseeing.

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

The chart illustrates May temperature patterns in Joetsu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Joetsu, May typically has an average temperature of 17°C (64°F), with highs reaching up to 29°C (85°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec383946536370788173645343
Data source: Temperature data for Joetsu 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 Joetsu

In Joetsu in May, the precipitation amount is 105 mm (4.1 in) over the course of 13 days.

May Precipitation Trends in Joetsu

The chart displays monthly precipitation patterns in Joetsu, 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 Joetsu, May typically receives around 105 mm (4.1 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec233181128121105105290157171190170273
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Joetsu

In Joetsu in May, humidity is 81%. With an average temperature of 17°C (64°F), this humidity feels like walking through a warm mist, enveloping you in a sticky embrace that can quickly lead to discomfort during long sightseeing excursions.

May Average Humidity in Joetsu

This chart illustrates the average monthly humidity levels in Joetsu, 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 Joetsu is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%81%79%81%88%92%92%89%87%85%86%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Joetsu

In Joetsu 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 Joetsu.

Maximum UV Index Levels in Joetsu for May

The chart shows the monthly maximum UV Index (UVI) for Joetsu 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 Joetsu typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3589101111119653
Data source: Joetsu 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 Joetsu Compares to Other Months

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

This table compares monthly weather conditions in Joetsu, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (38°F)233 mm (9.2 inches)88%moderate
February Weather4°C (39°F)181 mm (7.1 inches)86%moderate
March Weather8°C (46°F)128 mm (5.0 inches)81%very high
April Weather12°C (53°F)121 mm (4.7 inches)78%very high
May Weather17°C (64°F)105 mm (4.1 inches)81%very high
June Weather21°C (70°F)105 mm (4.1 inches)88%extreme
July Weather26°C (79°F)290 mm (11.4 inches)92%extreme
August Weather27°C (82°F)157 mm (6.2 inches)92%extreme
September Weather23°C (74°F)171 mm (6.7 inches)89%very high
October Weather18°C (64°F)190 mm (7.5 inches)87%high
November Weather12°C (53°F)170 mm (6.7 inches)85%moderate
December Weather6°C (43°F)273 mm (10.7 inches)86%moderate

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