December Weather in Sasayama, Japan

Last updated: August 23, 2025

In Sasayama, Japan, the average temperature in December hovers around 6°C (44°F). Expect a minimum of -6°C (21°F) and a maximum of 21°C (69°F), offering a wide range of conditions. With precipitation totaling 60 mm (2.4 in) over approximately 7 days, it's wise to prepare for some wet weather. The average humidity is a notable 83%, adding to the overall chilliness of the season.

December Temperature in Sasayama

In December in Sasayama, the average temperature is 6°C (44°F). Maximums can reach 21°C (69°F) and minimums can be as low as -6°C (21°F). Travelers should be prepared for a wide range of temperatures, so layering clothing is essential for comfort during this time.

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

The chart illustrates December temperature patterns in Sasayama, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sasayama, December typically has an average temperature of 6°C (44°F), with highs reaching up to 21°C (69°F) and lows dropping to around -6°C (21°F).

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

December Precipitation in Sasayama

In Sasayama in December, the precipitation amount is 60 mm (2.4 in) over the course of 7 days.

December Precipitation Trends in Sasayama

The chart displays monthly precipitation patterns in Sasayama, 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 Sasayama, December typically receives around 60 mm (2.4 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 Sasayama

In Sasayama in December, humidity is 83%. With an average temperature of 6°C (44°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and potentially leading to a sense of heaviness in the air.

December Average Humidity in Sasayama

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

In Sasayama 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 Sasayama, you can check the information here.

Maximum UV Index Levels in Sasayama for December

The chart shows the monthly maximum UV Index (UVI) for Sasayama 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 Sasayama typically reaches 3, which falls under the moderate exposure category.

Data source: Sasayama 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 Sasayama Compares to Other Months

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

This table compares monthly weather conditions in Sasayama, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (40°F)	46 mm (1.8 inches)	82%	moderate
February Weather	5°C (41°F)	59 mm (2.3 inches)	79%	high
March Weather	9°C (49°F)	111 mm (4.4 inches)	74%	very high
April Weather	13°C (56°F)	141 mm (5.6 inches)	76%	very high
May Weather	19°C (66°F)	140 mm (5.5 inches)	83%	extreme
June Weather	22°C (72°F)	147 mm (5.8 inches)	87%	extreme
July Weather	26°C (79°F)	327 mm (12.9 inches)	93%	extreme
August Weather	28°C (82°F)	223 mm (8.8 inches)	91%	extreme
September Weather	23°C (75°F)	205 mm (8.1 inches)	87%	very high
October Weather	18°C (65°F)	230 mm (9.1 inches)	85%	high
November Weather	12°C (54°F)	43 mm (1.7 inches)	83%	moderate
December Weather	6°C (44°F)	60 mm (2.4 inches)	83%	moderate