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December Weather in Ishii, Japan

Last updated: August 23, 2025

In December, the average temperature in Ishii, Japan hovers around 9°C (48°F), offering a mild climate. Expect temperatures to range from a brisk 0°C (32°F) to a pleasant 21°C (70°F). With 64 mm (2.5 in) of precipitation spread over 7 days, the air often carries a humidity level of 77%, adding to the distinctive charm of this season.

December Temperature in Ishii

In December in Ishii, the average temperature is 9°C (48°F). Maximums can reach 21°C (70°F), and minimums can drop as low as 0°C (32°F). This makes Ishii an ideal destination for travelers looking to experience mild weather with pleasant daytime temperatures, perfect for outdoor activities.

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

The chart illustrates December temperature patterns in Ishii, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ishii, December typically has an average temperature of 9°C (48°F), with highs reaching up to 21°C (70°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec434450576571788175665747
Data source: Temperature data for Ishii 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 Ishii

In Ishii in December, the precipitation amount is 64 mm (2.5 in) accumulated over a period of 7 days.

December Precipitation Trends in Ishii

The chart displays monthly precipitation patterns in Ishii, 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 Ishii, December typically receives around 64 mm (2.5 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec60711371451842343782262943606564
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Ishii

In Ishii in December, humidity is 77%. With an average temperature of 9°C (48°F), this humidity feels like a damp embrace, making traveling a bit more challenging as the cool air combines with the moisture, often leaving you with a chill that seeps into your bones.

December Average Humidity in Ishii

This chart illustrates the average monthly humidity levels in Ishii, 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 Ishii is approximately 77%, 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 December generated using information from the Copernicus Climate Change Service.

December UV Index in Ishii

In Ishii 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 Ishii for better planning.

Maximum UV Index Levels in Ishii for December

The chart shows the monthly maximum UV Index (UVI) for Ishii 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 Ishii typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468111112121210764
Data source: Ishii 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 Ishii Compares to Other Months

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

This table compares monthly weather conditions in Ishii, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)60 mm (2.4 inches)74%moderate
February Weather7°C (44°F)71 mm (2.8 inches)70%high
March Weather10°C (51°F)137 mm (5.4 inches)70%very high
April Weather14°C (57°F)145 mm (5.7 inches)76%extreme
May Weather18°C (65°F)184 mm (7.3 inches)82%extreme
June Weather21°C (71°F)234 mm (9.2 inches)86%extreme
July Weather26°C (78°F)378 mm (14.9 inches)91%extreme
August Weather27°C (81°F)226 mm (8.9 inches)88%extreme
September Weather24°C (75°F)294 mm (11.6 inches)85%very high
October Weather19°C (67°F)360 mm (14.2 inches)82%high
November Weather14°C (57°F)65 mm (2.5 inches)79%high
December Weather9°C (48°F)64 mm (2.5 inches)77%moderate

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