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December Weather in Iheya, Japan

Last updated: August 23, 2025

In December, the average temperature in Iheya, Japan is a pleasant 20°C (67°F). Expect minimums of around 13°C (56°F) and maximums reaching 25°C (77°F). However, be prepared for some rain, as the region experiences an average precipitation of 141 mm (5.5 in) over 16 days. With an average humidity of 75%, it's a good idea to pack accordingly for comfort!

December Temperature in Iheya

In December in Iheya, the average temperature is 20°C (67°F), with maximums reaching up to 25°C (77°F) and minimums dropping to a low of 13°C (56°F). This mild climate makes it an ideal time for travelers to explore and enjoy outdoor activities in Iheya.

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

The chart illustrates December temperature patterns in Iheya, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Iheya, December typically has an average temperature of 20°C (67°F), with highs reaching up to 25°C (77°F) and lows dropping to around 13°C (56°F).
JanFebMarAprMayJunJulAugSepOctNovDec646467707479828382787367
Data source: Temperature data for Iheya 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 Iheya

In Iheya in December, the precipitation amount is 141 mm (5.5 in) accumulated over 16 days.

December Precipitation Trends in Iheya

The chart displays monthly precipitation patterns in Iheya, 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 Iheya, December typically receives around 141 mm (5.5 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec103108132135215392173161204135107141
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Iheya

In Iheya in December humidity is 75%. With an average temperature of 20°C (67°F), this humidity feels like a warm, enveloping blanket that makes outdoor activities more strenuous, causing travelers to feel sticky and fatigued faster.

December Average Humidity in Iheya

This chart illustrates the average monthly humidity levels in Iheya, 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 Iheya 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 Iheya

In Iheya 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 Iheya, you can refer to this Hourly UV Index in Iheya.

Maximum UV Index Levels in Iheya for December

The chart shows the monthly maximum UV Index (UVI) for Iheya 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 Iheya typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec7811121313131312986
Data source: Iheya 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 Iheya Compares to Other Months

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

This table compares monthly weather conditions in Iheya, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather18°C (64°F)103 mm (4.1 inches)71%high
February Weather18°C (64°F)108 mm (4.3 inches)71%very high
March Weather19°C (67°F)132 mm (5.2 inches)76%extreme
April Weather21°C (70°F)135 mm (5.3 inches)82%extreme
May Weather24°C (75°F)214 mm (8.4 inches)84%extreme
June Weather26°C (79°F)392 mm (15.4 inches)86%extreme
July Weather28°C (83°F)173 mm (6.8 inches)86%extreme
August Weather28°C (83°F)161 mm (6.3 inches)82%extreme
September Weather28°C (82°F)204 mm (8.0 inches)82%extreme
October Weather26°C (78°F)135 mm (5.3 inches)80%very high
November Weather23°C (73°F)107 mm (4.2 inches)79%very high
December Weather20°C (67°F)141 mm (5.5 inches)75%high

Compare Iheya's Climate with Cities Worldwide