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May Weather in Koriyama, Japan

Last updated: August 23, 2025

In Koriyama, Japan, the average temperature in May hovers around 16°C (61°F). Expect a range where the minimum can dip to 4°C (39°F) and the maximum soars to 32°C (90°F). This month typically sees around 102 mm (4.0 in) of precipitation spread over 12 days, with an average humidity of 80%, making for a refreshing yet damp atmosphere.

May Temperature in Koriyama

In May in Koriyama, the average temperature is 16°C (61°F). The maximum can reach 32°C (90°F), while the minimum can be as low as 4°C (39°F). Be prepared for a wide range of temperatures during your travels!

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

The chart illustrates May temperature patterns in Koriyama, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Koriyama, May typically has an average temperature of 16°C (61°F), with highs reaching up to 32°C (90°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec323441506167747768584736
Data source: Temperature data for Koriyama 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 Koriyama

In Koriyama in May, the total precipitation amount is 102 mm (4.0 in), occurring over a span of 12 days.

May Precipitation Trends in Koriyama

The chart displays monthly precipitation patterns in Koriyama, 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 Koriyama, May typically receives around 102 mm (4.0 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec5344110991031002251231391903862
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Koriyama

In Koriyama in May, humidity is 80%. With an average temperature of 16°C (61°F), this humidity feels like a warm blanket wrapped around you, making sightseeing a sweat-inducing challenge but also lending a lush vibrancy to the surroundings that can enhance your travel experience.

May Average Humidity in Koriyama

This chart illustrates the average monthly humidity levels in Koriyama, 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 Koriyama is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%75%72%73%80%87%93%90%84%80%77%77%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Koriyama

In Koriyama 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 Koriyama.

Maximum UV Index Levels in Koriyama for May

The chart shows the monthly maximum UV Index (UVI) for Koriyama 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 Koriyama typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101111119653
Data source: Koriyama 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 Koriyama Compares to Other Months

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

This table compares monthly weather conditions in Koriyama, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)53 mm (2.1 inches)76%moderate
February Weather1°C (34°F)44 mm (1.7 inches)75%moderate
March Weather5°C (42°F)110 mm (4.3 inches)72%high
April Weather10°C (50°F)99 mm (3.9 inches)73%very high
May Weather16°C (61°F)102 mm (4.0 inches)80%very high
June Weather19°C (67°F)100 mm (3.9 inches)87%extreme
July Weather23°C (74°F)225 mm (8.8 inches)92%extreme
August Weather25°C (77°F)123 mm (4.8 inches)90%extreme
September Weather20°C (68°F)139 mm (5.5 inches)84%very high
October Weather14°C (58°F)190 mm (7.5 inches)80%high
November Weather8°C (47°F)38 mm (1.5 inches)77%moderate
December Weather2°C (37°F)62 mm (2.4 inches)77%moderate

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