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September Weather in Innoshima, Japan

Last updated: August 23, 2025

In September, the average temperature in Innoshima, Japan hovers around 25°C (78°F), offering a pleasant climate for outdoor activities. Expect a range with minimums of 18°C (65°F) and maximums reaching up to 33°C (91°F). However, don't forget your umbrella as rainfall averages around 177 mm (7.0 in) over 12 days, accompanied by a notable average humidity of 87%.

September Temperature in Innoshima

In September in Innoshima, the average temperature is 25°C (78°F). Maximum temperatures can reach 33°C (91°F), while minimums can dip to as low as 18°C (65°F). This pleasant climate makes Innoshima an ideal destination for travelers seeking enjoyable weather and outdoor activities.

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

The chart illustrates September temperature patterns in Innoshima, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Innoshima, September typically has an average temperature of 25°C (78°F), with highs reaching up to 33°C (91°F) and lows dropping to around 18°C (65°F).
JanFebMarAprMayJunJulAugSepOctNovDec454551586672808377685949
Data source: Temperature data for Innoshima 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 Innoshima

In Innoshima in September, the total precipitation amount is 177 mm (7.0 in) spread out over 12 days.

September Precipitation Trends in Innoshima

The chart displays monthly precipitation patterns in Innoshima, 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 Innoshima, September typically receives around 177 mm (7.0 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec54671051221161512851331772015064
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Innoshima

In Innoshima in September, humidity is 87%. With an average temperature of 25°C (78°F), this humidity feels like a warm, heavy blanket enveloping you, making outdoor activities particularly strenuous and requiring frequent breaks for hydration and shade.

September Average Humidity in Innoshima

This chart illustrates the average monthly humidity levels in Innoshima, 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 Innoshima is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%79%73%74%84%86%92%92%87%85%84%82%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Innoshima

In Innoshima in September, 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 Innoshima.

Maximum UV Index Levels in Innoshima for September

The chart shows the monthly maximum UV Index (UVI) for Innoshima 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 Innoshima typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec458101111121210764
Data source: Innoshima 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 Innoshima Compares to Other Months

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

This table compares monthly weather conditions in Innoshima, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (45°F)54 mm (2.1 inches)82%moderate
February Weather7°C (45°F)67 mm (2.6 inches)79%moderate
March Weather11°C (51°F)105 mm (4.1 inches)73%very high
April Weather14°C (58°F)122 mm (4.8 inches)74%very high
May Weather19°C (66°F)116 mm (4.6 inches)84%extreme
June Weather22°C (73°F)151 mm (5.9 inches)86%extreme
July Weather26°C (80°F)285 mm (11.2 inches)92%extreme
August Weather29°C (84°F)133 mm (5.2 inches)92%extreme
September Weather25°C (78°F)177 mm (7.0 inches)87%very high
October Weather20°C (69°F)201 mm (7.9 inches)85%high
November Weather15°C (59°F)50 mm (2.0 inches)84%high
December Weather10°C (50°F)64 mm (2.5 inches)82%moderate

Compare Innoshima's Climate with Cities Worldwide