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December Weather in Kamaishi, Japan

Last updated: August 23, 2025

In December, the average temperature in Kamaishi, Japan hovers around 2°C (36°F). Expect chilly moments, as minimums can drop to -6°C (21°F), while the mercury may rise to a pleasant 16°C (61°F). With 67 mm (2.6 in) of precipitation spread over 10 days, be prepared for some wet weather. On top of that, the average humidity rests at a cozy 80%, making it a uniquely atmospheric time to visit!

December Temperature in Kamaishi

In December in Kamaishi, the average temperature is 2°C (36°F). Maximum temperatures can reach 16°C (61°F), while minimum temperatures can drop as low as -6°C (21°F). This variation makes it essential for travelers to pack accordingly to enjoy their visit comfortably.

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

The chart illustrates December temperature patterns in Kamaishi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kamaishi, December typically has an average temperature of 2°C (36°F), with highs reaching up to 16°C (61°F) and lows dropping to around -6°C (21°F).
JanFebMarAprMayJunJulAugSepOctNovDec333340475763707367574736
Data source: Temperature data for Kamaishi 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 Kamaishi

In Kamaishi in December, the total precipitation amount is 67 mm (2.6 in) over a period of 10 days.

December Precipitation Trends in Kamaishi

The chart displays monthly precipitation patterns in Kamaishi, 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 Kamaishi, December typically receives around 67 mm (2.6 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec45561211231181351872081712235667
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Kamaishi

In Kamaishi in December humidity is 80%. With an average temperature of 2°C (36°F), this humidity feels like a heavy, damp chill that seeps into your bones, making it challenging for outdoor adventures and often necessitating layered clothing to stay warm and comfortable while exploring.

December Average Humidity in Kamaishi

This chart illustrates the average monthly humidity levels in Kamaishi, 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 Kamaishi is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%79%77%75%80%87%92%92%86%82%79%80%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Kamaishi

In Kamaishi in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Kamaishi, you can check the information here.

Maximum UV Index Levels in Kamaishi for December

The chart shows the monthly maximum UV Index (UVI) for Kamaishi 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 Kamaishi typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec346891110109643
Data source: Kamaishi 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 Kamaishi Compares to Other Months

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

This table compares monthly weather conditions in Kamaishi, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)45 mm (1.8 inches)80%moderate
February Weather1°C (33°F)56 mm (2.2 inches)79%moderate
March Weather4°C (40°F)121 mm (4.8 inches)77%high
April Weather8°C (47°F)123 mm (4.9 inches)75%very high
May Weather14°C (57°F)118 mm (4.7 inches)80%very high
June Weather17°C (63°F)135 mm (5.3 inches)87%extreme
July Weather21°C (70°F)187 mm (7.3 inches)92%very high
August Weather23°C (73°F)208 mm (8.2 inches)92%very high
September Weather20°C (67°F)171 mm (6.7 inches)86%very high
October Weather14°C (58°F)223 mm (8.8 inches)82%high
November Weather8°C (47°F)56 mm (2.2 inches)79%moderate
December Weather2°C (36°F)67 mm (2.6 inches)80%moderate

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