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June Weather in Seiyo, Japan

Last updated: August 23, 2025

In Seiyo, Japan, the average temperature for June hovers around 22°C (71°F), providing a pleasant climate for outdoor activities. Expect temperatures to range from a cool 11°C (52°F) to a warm 31°C (87°F). However, be prepared for frequent showers, as the area receives an average precipitation of 236 mm (9.3 in) over 15 days. With an average humidity of 86%, the air can feel quite moist, so pack accordingly!

June Temperature in Seiyo

In June in Seiyo, the average temperature is 22°C (71°F). The maximum can reach 31°C (87°F), while the minimum can drop to as low as 11°C (52°F). This pleasant climate makes Seiyo an ideal destination for outdoor activities and sightseeing.

June Weather in Seiyo: Daily Temperature Highs, Lows, and Averages

The chart illustrates June temperature patterns in Seiyo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Seiyo, June typically has an average temperature of 22°C (71°F), with highs reaching up to 31°C (87°F) and lows dropping to around 11°C (52°F).
JanFebMarAprMayJunJulAugSepOctNovDec394149576571778073645243
Data source: Temperature data for Seiyo 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.

June Precipitation in Seiyo

In Seiyo in June, the total precipitation amount is 236 mm (9.3 in) over a span of 15 days.

June Precipitation Trends in Seiyo

The chart displays monthly precipitation patterns in Seiyo, with values for each month alongside June’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how June’s conditions compare to those of other months. In Seiyo, June typically receives around 236 mm (9.3 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec60971401401742364092192292136269
Data source: Precipitation data for June generated using information from the Copernicus Climate Change Service.
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June Humidity in Seiyo

In Seiyo in June humidity is 86%. With an average temperature of 22°C (71°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities feel muggy and draining.

June Average Humidity in Seiyo

This chart illustrates the average monthly humidity levels in Seiyo, with June’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In June, average humidity in Seiyo is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec74%70%70%76%83%86%91%88%85%82%79%77%
Data source: Humidity data for June generated using information from the Copernicus Climate Change Service.

June UV Index in Seiyo

In Seiyo in June, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Seiyo.

Maximum UV Index Levels in Seiyo for June

The chart shows the monthly maximum UV Index (UVI) for Seiyo in June, 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 June, the maximum UV index in Seiyo typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469101211121211864
Data source: Seiyo June 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 June Weather in Seiyo Compares to Other Months

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

This table compares monthly weather conditions in Seiyo, showing how June’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (40°F)60 mm (2.4 inches)74%moderate
February Weather5°C (41°F)97 mm (3.8 inches)70%high
March Weather9°C (49°F)140 mm (5.5 inches)70%very high
April Weather14°C (57°F)140 mm (5.5 inches)76%very high
May Weather18°C (65°F)174 mm (6.8 inches)82%extreme
June Weather22°C (71°F)236 mm (9.3 inches)86%extreme
July Weather25°C (78°F)409 mm (16.1 inches)91%extreme
August Weather27°C (80°F)219 mm (8.6 inches)88%extreme
September Weather23°C (74°F)229 mm (9.0 inches)85%extreme
October Weather18°C (64°F)213 mm (8.4 inches)82%very high
November Weather11°C (52°F)62 mm (2.4 inches)79%high
December Weather6°C (43°F)69 mm (2.7 inches)77%moderate

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