December Weather in Kawaguchi, Japan

Last updated: August 23, 2025

In December, the average temperature in Kawaguchi, Japan is a mild 8°C (46°F), with a notable range from a chilly -2°C (28°F) to a warm 21°C (70°F). Expect about 56 mm (2.2 in) of precipitation over the course of 7 days, accompanied by an average humidity of 78%. Whether you’re exploring the outdoors or enjoying cozy indoor activities, this month offers a delightful blend of weather conditions!

December Temperature in Kawaguchi

In December in Kawaguchi, the average temperature is 8°C (46°F). Maximums can reach 21°C (70°F) and minimums can be as low as -2°C (28°F). Travelers should be prepared for a wide range of temperatures, making it essential to pack both warmer and lighter clothing options.

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

The chart illustrates December temperature patterns in Kawaguchi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kawaguchi, December typically has an average temperature of 8°C (46°F), with highs reaching up to 21°C (70°F) and lows dropping to around -2°C (28°F).

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

December Precipitation in Kawaguchi

In Kawaguchi in December, the total precipitation amount is 56 mm (2.2 in) over a period of 7 days.

December Precipitation Trends in Kawaguchi

The chart displays monthly precipitation patterns in Kawaguchi, 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 Kawaguchi, December typically receives around 56 mm (2.2 inches) of precipitation spread over approximately 7 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

December Humidity in Kawaguchi

In Kawaguchi in December, humidity is 78%. With an average temperature of 8°C (46°F), this humidity feels like a chilly dampness that clings to your skin, making outdoor activities a bit uncomfortable and prompting you to dress in layers to stay warm while exploring.

December Average Humidity in Kawaguchi

This chart illustrates the average monthly humidity levels in Kawaguchi, 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 Kawaguchi is approximately 78%, 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 Kawaguchi

In Kawaguchi 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 Kawaguchi for better planning.

Maximum UV Index Levels in Kawaguchi for December

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

Data source: Kawaguchi 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 Kawaguchi Compares to Other Months

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

This table compares monthly weather conditions in Kawaguchi, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (41°F)	46 mm (1.8 inches)	76%	moderate
February Weather	6°C (43°F)	41 mm (1.6 inches)	74%	moderate
March Weather	10°C (51°F)	132 mm (5.2 inches)	70%	very high
April Weather	14°C (58°F)	116 mm (4.6 inches)	74%	very high
May Weather	20°C (68°F)	111 mm (4.4 inches)	81%	extreme
June Weather	23°C (73°F)	152 mm (6.0 inches)	88%	extreme
July Weather	26°C (79°F)	221 mm (8.7 inches)	93%	extreme
August Weather	28°C (83°F)	103 mm (4.1 inches)	90%	extreme
September Weather	24°C (75°F)	186 mm (7.3 inches)	86%	very high
October Weather	19°C (66°F)	273 mm (10.7 inches)	83%	high
November Weather	13°C (56°F)	77 mm (3.0 inches)	80%	moderate
December Weather	8°C (46°F)	56 mm (2.2 inches)	78%	moderate