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December Weather in Isen, Japan

Last updated: August 23, 2025

In December, the average temperature in Isen, Japan is a comfortable 19°C (66°F). Expect minimums around 13°C (55°F) and maximums of 25°C (77°F), making it a pleasant time of year. However, be prepared for some rain, as 127 mm (5.0 in) of precipitation can be expected over approximately 16 days. The average humidity hovers around 75%, adding a touch of dampness to the air.

December Temperature in Isen

In December in Isen, the average temperature is 19°C (66°F). Maximums can reach 25°C (77°F), while minimums can drop as low as 13°C (55°F). This pleasant climate makes Isen an ideal destination for travelers seeking mild weather and comfortable outdoor activities.

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

The chart illustrates December temperature patterns in Isen, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Isen, December typically has an average temperature of 19°C (66°F), with highs reaching up to 25°C (77°F) and lows dropping to around 13°C (55°F).
JanFebMarAprMayJunJulAugSepOctNovDec636366697378828382777266
Data source: Temperature data for Isen 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 Isen

In Isen in December, the precipitation amount is 127 mm (5.0 in), distributed over 16 days.

December Precipitation Trends in Isen

The chart displays monthly precipitation patterns in Isen, 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 Isen, December typically receives around 127 mm (5.0 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec109117153114192456208150211137130127
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Isen

In Isen in December humidity is 75%. With an average temperature of 19°C (66°F), this humidity feels like a warm, enveloping blanket, making it slightly uncomfortable for traveling as you navigate through the thick, muggy air.

December Average Humidity in Isen

This chart illustrates the average monthly humidity levels in Isen, 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 Isen is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec71%71%76%82%84%86%86%82%82%81%79%75%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Isen

In Isen in December, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Isen, you can refer to this Hourly UV Index in Isen.

Maximum UV Index Levels in Isen for December

The chart shows the monthly maximum UV Index (UVI) for Isen 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 Isen typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec6811121213131312986
Data source: Isen 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 Isen Compares to Other Months

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

This table compares monthly weather conditions in Isen, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather17°C (63°F)109 mm (4.3 inches)71%high
February Weather17°C (63°F)117 mm (4.6 inches)71%very high
March Weather19°C (66°F)153 mm (6.0 inches)76%extreme
April Weather20°C (69°F)114 mm (4.5 inches)82%extreme
May Weather23°C (74°F)192 mm (7.5 inches)84%extreme
June Weather26°C (78°F)456 mm (17.9 inches)86%extreme
July Weather28°C (82°F)208 mm (8.2 inches)86%extreme
August Weather28°C (83°F)150 mm (5.9 inches)82%extreme
September Weather28°C (82°F)211 mm (8.3 inches)82%extreme
October Weather25°C (78°F)137 mm (5.4 inches)80%very high
November Weather22°C (72°F)130 mm (5.1 inches)79%very high
December Weather19°C (66°F)127 mm (5.0 inches)75%high

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