December Weather in Kainan, Japan

Last updated: August 23, 2025

In December, the average temperature in Kainan, Japan is a cool 9°C (48°F). Temperatures can vary significantly, with a minimum of 2°C (35°F) and a maximum reaching 21°C (70°F). Expect 76 mm (3.0 in) of precipitation over 10 days, contributing to an average humidity of 83%. Stay prepared for those cozy, rainy days!

December Temperature in Kainan

In December in Kainan, the average temperature is 9°C (48°F). Maximums can reach 21°C (70°F), while minimums can drop as low as 2°C (35°F). Travelers should prepare for a range of temperatures and pack accordingly for a comfortable visit.

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

The chart illustrates December temperature patterns in Kainan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kainan, December typically has an average temperature of 9°C (48°F), with highs reaching up to 21°C (70°F) and lows dropping to around 2°C (35°F).

Data source: Temperature data for Kainan generated using information from the Copernicus Climate Change Service.

December Precipitation in Kainan

In Kainan in December, the total precipitation amount is 76 mm (3.0 in) spread over a period of 10 days.

December Precipitation Trends in Kainan

The chart displays monthly precipitation patterns in Kainan, 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 Kainan, December typically receives around 76 mm (3.0 inches) of precipitation spread over approximately 10 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

December Humidity in Kainan

In Kainan in December humidity is 83%. With an average temperature of 9°C (48°F), this humidity feels like an enveloping blanket, making outdoor activities quite uncomfortable and encouraging travelers to seek shelter or shade frequently.

December Average Humidity in Kainan

This chart illustrates the average monthly humidity levels in Kainan, 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 Kainan is approximately 83%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Kainan

In Kainan 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 Kainan for better planning.

Maximum UV Index Levels in Kainan for December

The chart shows the monthly maximum UV Index (UVI) for Kainan 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 Kainan typically reaches 4, which falls under the moderate exposure category.

Data source: Kainan 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 Kainan Compares to Other Months

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

This table compares monthly weather conditions in Kainan, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	6°C (44°F)	63 mm (2.5 inches)	82%	moderate
February Weather	7°C (44°F)	76 mm (3.0 inches)	79%	moderate
March Weather	10°C (51°F)	115 mm (4.5 inches)	74%	very high
April Weather	14°C (58°F)	128 mm (5.1 inches)	76%	extreme
May Weather	19°C (67°F)	164 mm (6.5 inches)	83%	extreme
June Weather	22°C (72°F)	199 mm (7.8 inches)	87%	extreme
July Weather	26°C (80°F)	302 mm (11.9 inches)	93%	extreme
August Weather	28°C (83°F)	178 mm (7.0 inches)	91%	extreme
September Weather	25°C (77°F)	203 mm (8.0 inches)	87%	very high
October Weather	20°C (67°F)	267 mm (10.5 inches)	85%	high
November Weather	14°C (57°F)	63 mm (2.5 inches)	83%	moderate
December Weather	9°C (48°F)	76 mm (3.0 inches)	83%	moderate