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September Weather in Hirakawa, Japan

Last updated: August 23, 2025

In September, the average temperature in Hirakawa, Japan hovers around 19°C (66°F), with a typical range from a brisk 5°C (42°F) to a sweltering 34°C (93°F). Rainfall is not uncommon, with a total precipitation of 140 mm (5.5 in) occurring over 14 days. Additionally, expect high humidity levels at an average of 89%, making for a warm and moist climate.

September Temperature in Hirakawa

In September in Hirakawa, the average temperature is 19°C (66°F), with maximums reaching 34°C (93°F) and minimums dipping as low as 5°C (42°F). It's a great time to visit for pleasant weather, but be prepared for both warm days and cooler evenings.

September Weather in Hirakawa: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Hirakawa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hirakawa, September typically has an average temperature of 19°C (66°F), with highs reaching up to 34°C (93°F) and lows dropping to around 5°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec272836455764727366544331
Data source: Temperature data for Hirakawa 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.

September Precipitation in Hirakawa

In Hirakawa in September, the precipitation amount is 140 mm (5.5 in) over the course of 14 days.

September Precipitation Trends in Hirakawa

The chart displays monthly precipitation patterns in Hirakawa, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Hirakawa, September typically receives around 140 mm (5.5 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec84116112129111141152183140175115133
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Hirakawa

In Hirakawa in September humidity is 89%. With an average temperature of 19°C (66°F), this humidity feels like walking through a damp blanket, making every step more laborious and the air thick, potentially leading to discomfort while exploring or sightseeing.

September Average Humidity in Hirakawa

This chart illustrates the average monthly humidity levels in Hirakawa, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Hirakawa is approximately 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec79%78%77%78%86%91%95%97%89%82%78%77%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Hirakawa

In Hirakawa in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Hirakawa.

Maximum UV Index Levels in Hirakawa for September

The chart shows the monthly maximum UV Index (UVI) for Hirakawa in September, 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 September, the maximum UV index in Hirakawa typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec346891010119642
Data source: Hirakawa September 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 September Weather in Hirakawa Compares to Other Months

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

This table compares monthly weather conditions in Hirakawa, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (28°F)84 mm (3.3 inches)79%moderate
February Weather-2°C (29°F)116 mm (4.6 inches)78%moderate
March Weather2°C (36°F)112 mm (4.4 inches)77%high
April Weather7°C (45°F)129 mm (5.1 inches)78%very high
May Weather14°C (57°F)111 mm (4.4 inches)86%very high
June Weather18°C (64°F)141 mm (5.5 inches)91%very high
July Weather22°C (72°F)152 mm (6.0 inches)95%very high
August Weather23°C (74°F)183 mm (7.2 inches)97%extreme
September Weather19°C (66°F)140 mm (5.5 inches)89%very high
October Weather12°C (54°F)175 mm (6.9 inches)81%high
November Weather6°C (43°F)115 mm (4.5 inches)78%moderate
December Weather-1°C (31°F)133 mm (5.2 inches)77%low

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