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December Weather in Sumoto, Japan

Last updated: August 23, 2025

In December, the average temperature in Sumoto, Japan hovers around 11°C (51°F). Expect a minimum of 3°C (38°F) and a maximum of 20°C (68°F), making for a diverse range of daily temperatures. During this time, precipitation amounts to approximately 83 mm (3.3 in) over 11 days, contributing to a high average humidity of 82%. Be prepared for the moist atmosphere as you explore this charming locale!

December Temperature in Sumoto

In December in Sumoto, the average temperature is 11°C (51°F). Maximums can reach 20°C (68°F), while minimums can drop to as low as 3°C (38°F). It's advisable to pack layers for your travels to Sumoto during this time, as the weather can vary significantly throughout the day.

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

The chart illustrates December temperature patterns in Sumoto, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sumoto, December typically has an average temperature of 11°C (51°F), with highs reaching up to 20°C (68°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec464651576470778176686051
Data source: Temperature data for Sumoto 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 Sumoto

In Sumoto in December, the precipitation amount is 83 mm (3.3 in) over the course of 11 days.

December Precipitation Trends in Sumoto

The chart displays monthly precipitation patterns in Sumoto, 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 Sumoto, December typically receives around 83 mm (3.3 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec65741171331711922911542062926883
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Sumoto

In Sumoto in December, humidity is 82%. With an average temperature of 11°C (51°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities uncomfortable and requiring additional layers to stay warm while exploring.

December Average Humidity in Sumoto

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

In Sumoto 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 Sumoto for better planning.

Maximum UV Index Levels in Sumoto for December

The chart shows the monthly maximum UV Index (UVI) for Sumoto 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 Sumoto typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec458111111121110754
Data source: Sumoto 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 Sumoto Compares to Other Months

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

This table compares monthly weather conditions in Sumoto, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (46°F)65 mm (2.6 inches)82%moderate
February Weather8°C (46°F)74 mm (2.9 inches)79%moderate
March Weather10°C (51°F)117 mm (4.6 inches)73%very high
April Weather14°C (57°F)132 mm (5.2 inches)74%extreme
May Weather18°C (64°F)171 mm (6.7 inches)84%extreme
June Weather21°C (70°F)192 mm (7.5 inches)86%extreme
July Weather25°C (78°F)291 mm (11.5 inches)92%extreme
August Weather27°C (81°F)154 mm (6.1 inches)92%extreme
September Weather25°C (77°F)206 mm (8.1 inches)87%very high
October Weather20°C (69°F)292 mm (11.5 inches)85%high
November Weather16°C (60°F)68 mm (2.7 inches)84%moderate
December Weather11°C (51°F)83 mm (3.3 inches)82%moderate

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