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December Weather in Innoshima, Japan

Last updated: August 23, 2025

In Innoshima, Japan, the average temperature in December typically hovers around 10°C (50°F). You can expect minimums dipping to 2°C (36°F) and maximums reaching up to 20°C (68°F). Be prepared for some rainy days, with 64 mm (2.5 in) of precipitation spread over 11 days. Additionally, the average humidity sits at a comfortable 82%, making for a moist but enjoyable atmosphere.

December Temperature in Innoshima

In December in Innoshima, the average temperature is 10°C (50°F). Maximums can reach 20°C (68°F), while minimums can drop as low as 2°C (36°F). This variability in temperature makes it important to pack layers for your trip to Innoshima.

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

The chart illustrates December 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, December typically has an average temperature of 10°C (50°F), with highs reaching up to 20°C (68°F) and lows dropping to around 2°C (36°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.

December Precipitation in Innoshima

In Innoshima in December, the total precipitation amount is 64 mm (2.5 in) spread over 11 days.

December Precipitation Trends in Innoshima

The chart displays monthly precipitation patterns in Innoshima, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Innoshima, December typically receives around 64 mm (2.5 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec54671051221161512851331772015064
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Innoshima

In Innoshima in December, humidity is 82%. With an average temperature of 10°C (50°F), this humidity feels like a dense, heavy blanket wrapping around you, making every step feel sluggish and the air thick, which can make traveling quite uncomfortable.

December Average Humidity in Innoshima

This chart illustrates the average monthly humidity levels in Innoshima, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Innoshima is approximately 82%, 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 December generated using information from the Copernicus Climate Change Service.

December UV Index in Innoshima

In Innoshima in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Innoshima for better planning.

Maximum UV Index Levels in Innoshima for December

The chart shows the monthly maximum UV Index (UVI) for Innoshima in December, 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 December, the maximum UV index in Innoshima typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec458101111121210764
Data source: Innoshima December 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 December 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 December’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 December’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

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