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December Weather in Tsunagi, Japan

Last updated: August 23, 2025

In Tsunagi, Japan, the average temperature in December hovers around 8°C (47°F), making it a brisk time of year. Temps can dip to a chilling -1°C (30°F) and occasionally rise to a pleasant 24°C (75°F). Expect about 90 mm (3.5 in) of precipitation spread over 8 days, with an average humidity of 79% that adds to the atmosphere of the season.

December Temperature in Tsunagi

In December in Tsunagi, the average temperature is 8°C (47°F), with maximums reaching 24°C (75°F) and minimums dropping as low as -1°C (30°F). Be sure to pack for a range of temperatures if you plan to travel during this month.

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

The chart illustrates December temperature patterns in Tsunagi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Tsunagi, December typically has an average temperature of 8°C (47°F), with highs reaching up to 24°C (75°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec444654616873808277685647
Data source: Temperature data for Tsunagi 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 Tsunagi

In Tsunagi in December, the precipitation amount is 90 mm (3.5 in) spread over 8 days, indicating a relatively wet period for the region.

December Precipitation Trends in Tsunagi

The chart displays monthly precipitation patterns in Tsunagi, 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 Tsunagi, December typically receives around 90 mm (3.5 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec611051491432343434652422281319690
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Tsunagi

In Tsunagi in December, humidity is 79%. With an average temperature of 8°C (47°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities less enjoyable and requiring extra layers to stay comfortable while traveling.

December Average Humidity in Tsunagi

This chart illustrates the average monthly humidity levels in Tsunagi, 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 Tsunagi is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec75%71%71%78%84%86%92%91%84%83%81%79%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Tsunagi

In Tsunagi 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 Tsunagi for better planning.

Maximum UV Index Levels in Tsunagi for December

The chart shows the monthly maximum UV Index (UVI) for Tsunagi 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 Tsunagi typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec569111212121311864
Data source: Tsunagi 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 Tsunagi Compares to Other Months

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

This table compares monthly weather conditions in Tsunagi, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (44°F)61 mm (2.4 inches)75%moderate
February Weather8°C (46°F)105 mm (4.1 inches)71%high
March Weather12°C (54°F)149 mm (5.9 inches)71%very high
April Weather16°C (61°F)143 mm (5.6 inches)78%extreme
May Weather20°C (68°F)234 mm (9.2 inches)84%extreme
June Weather23°C (74°F)342 mm (13.5 inches)86%extreme
July Weather27°C (80°F)465 mm (18.3 inches)92%extreme
August Weather28°C (82°F)242 mm (9.5 inches)91%extreme
September Weather25°C (77°F)228 mm (9.0 inches)84%extreme
October Weather20°C (68°F)131 mm (5.2 inches)83%very high
November Weather14°C (57°F)96 mm (3.8 inches)81%high
December Weather8°C (47°F)90 mm (3.5 inches)79%moderate

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