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August Weather in Seiyo, Japan

Last updated: August 23, 2025

In August, the average temperature in Seiyo, Japan is a warm 27°C (80°F), with a minimum of 18°C (64°F) and a maximum soaring to 35°C (95°F). Prepare for some wet days, as precipitation averages 219 mm (8.6 in) over 17 days, and don’t forget the humidity—averaging a sticky 88%!

August Temperature in Seiyo

In August in Seiyo, the average temperature is 27°C (80°F), with a maximum that can reach 35°C (95°F) and a minimum that can be as low as 18°C (64°F). This comfortable climate makes Seiyo an ideal destination for travelers looking to enjoy warm weather and outdoor activities.

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

The chart illustrates August 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, August typically has an average temperature of 27°C (80°F), with highs reaching up to 35°C (95°F) and lows dropping to around 18°C (64°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.

August Precipitation in Seiyo

In Seiyo, in August, the precipitation amount is 219 mm (8.6 in) over a span of 17 days.

August Precipitation Trends in Seiyo

The chart displays monthly precipitation patterns in Seiyo, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Seiyo, August typically receives around 219 mm (8.6 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec60971401401742364092192292136269
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Seiyo

In Seiyo in August, humidity is 88%. With an average temperature of 27°C (80°F), this humidity feels like a warm, thick blanket enveloping you, making travel quite uncomfortable as you navigate the sticky air and sweat almost immediately.

August Average Humidity in Seiyo

This chart illustrates the average monthly humidity levels in Seiyo, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Seiyo is approximately 88%, 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 August generated using information from the Copernicus Climate Change Service.

August UV Index in Seiyo

In Seiyo in August, 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 Seiyo.

Maximum UV Index Levels in Seiyo for August

The chart shows the monthly maximum UV Index (UVI) for Seiyo in August, 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 August, the maximum UV index in Seiyo typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469101211121211864
Data source: Seiyo August 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 August 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 August’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 August’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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