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December Weather in Soma, Japan

Last updated: August 23, 2025

In December, the average temperature in Soma, Japan is a cool 7°C (45°F), with a minimum dipping to 0°C (32°F) and reaching a comfortable maximum of 17°C (63°F). Visitors should be prepared for some rain, as 60 mm (2.4 in) of precipitation can be expected over 11 days. The atmosphere tends to be quite humid, with an average humidity level of 77%, making it essential to dress accordingly for the damp weather.

December Temperature in Soma

In December in Soma, the average temperature is 7°C (45°F). The maximum can reach 17°C (63°F) and the minimum can be as low as 0°C (32°F). Be prepared for a cool and varied climate, making it an ideal time for layered clothing while exploring the area.

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

The chart illustrates December temperature patterns in Soma, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Soma, December typically has an average temperature of 7°C (45°F), with highs reaching up to 17°C (63°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec404145516066737772645545
Data source: Temperature data for Soma 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 Soma

In Soma in December, the precipitation amount is 60 mm (2.4 in) over the course of 11 days.

December Precipitation Trends in Soma

The chart displays monthly precipitation patterns in Soma, 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 Soma, December typically receives around 60 mm (2.4 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec52411171151191052391581912574460
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Soma

In Soma in December, humidity is 77%. With an average temperature of 7°C (45°F), this humidity feels like a damp chill that clings to your skin, making it important to dress in layers for comfort while exploring the area.

December Average Humidity in Soma

This chart illustrates the average monthly humidity levels in Soma, 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 Soma is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%75%72%73%80%87%93%90%84%80%77%77%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Soma

In Soma 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 Soma, you can check the information here.

Maximum UV Index Levels in Soma for December

The chart shows the monthly maximum UV Index (UVI) for Soma 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 Soma typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101011119653
Data source: Soma 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 Soma Compares to Other Months

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

This table compares monthly weather conditions in Soma, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (40°F)52 mm (2.1 inches)76%moderate
February Weather5°C (41°F)41 mm (1.6 inches)75%moderate
March Weather7°C (46°F)117 mm (4.6 inches)72%high
April Weather11°C (51°F)115 mm (4.5 inches)73%very high
May Weather16°C (60°F)119 mm (4.7 inches)80%very high
June Weather19°C (66°F)105 mm (4.1 inches)87%very high
July Weather23°C (73°F)239 mm (9.4 inches)92%extreme
August Weather25°C (77°F)158 mm (6.2 inches)90%extreme
September Weather22°C (72°F)191 mm (7.5 inches)84%very high
October Weather18°C (64°F)257 mm (10.1 inches)80%high
November Weather13°C (55°F)44 mm (1.7 inches)77%moderate
December Weather7°C (45°F)60 mm (2.4 inches)77%moderate

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