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December Weather in Hayashima, Japan

Last updated: August 23, 2025

In Hayashima, Japan, the average temperature in December hovers around 9°C (48°F). Expect chilly evenings with minimums dropping to 2°C (35°F), while daytime highs can reach a pleasant 20°C (67°F). Be prepared for some rain, as 50 mm (2.0 in) of precipitation is likely over 7 days, accompanied by a high average humidity of 82%.

December Temperature in Hayashima

In December in Hayashima, the average temperature is 9°C (48°F). Maximums can reach 20°C (67°F), and minimums can be as low as 2°C (35°F). Travelers should be prepared for a mix of cool and mild weather during this time.

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

The chart illustrates December temperature patterns in Hayashima, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hayashima, December typically has an average temperature of 9°C (48°F), with highs reaching up to 20°C (67°F) and lows dropping to around 2°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec444450576571798277685848
Data source: Temperature data for Hayashima 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 Hayashima

In Hayashima in December, the precipitation amount is 50 mm (2.0 in) over a span of 7 days.

December Precipitation Trends in Hayashima

The chart displays monthly precipitation patterns in Hayashima, 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 Hayashima, December typically receives around 50 mm (2.0 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec41561001261211502791441871933850
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Hayashima

In Hayashima in December, humidity is 82%. With an average temperature of 9°C (48°F), this humidity feels like a damp chill that seeps into your bones, making it essential to dress in layers for your travels while keeping an umbrella handy for unexpected drizzles.

December Average Humidity in Hayashima

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

In Hayashima 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 Hayashima for better planning.

Maximum UV Index Levels in Hayashima for December

The chart shows the monthly maximum UV Index (UVI) for Hayashima 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 Hayashima typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec458101111121210754
Data source: Hayashima 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 Hayashima Compares to Other Months

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

This table compares monthly weather conditions in Hayashima, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (44°F)41 mm (1.6 inches)82%moderate
February Weather7°C (44°F)56 mm (2.2 inches)79%moderate
March Weather10°C (50°F)100 mm (3.9 inches)73%very high
April Weather14°C (57°F)126 mm (5.0 inches)74%very high
May Weather18°C (65°F)121 mm (4.8 inches)84%extreme
June Weather22°C (72°F)150 mm (5.9 inches)86%extreme
July Weather26°C (79°F)279 mm (11.0 inches)92%extreme
August Weather28°C (83°F)144 mm (5.7 inches)92%extreme
September Weather25°C (77°F)187 mm (7.3 inches)87%very high
October Weather20°C (68°F)193 mm (7.6 inches)85%high
November Weather14°C (58°F)38 mm (1.5 inches)84%moderate
December Weather9°C (48°F)50 mm (2.0 inches)82%moderate

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