January Weather in Katsuyama, Japan

Last updated: August 23, 2025

In January, the average temperature in Katsuyama, Japan hovers around -1°C (30°F), with minimums dipping to -11°C (13°F) and rising to maximums of 11°C (53°F). Expect precipitation of approximately 165 mm (6.5 in) over 21 rainy days, accompanied by an average humidity of 82%. This chilly, damp weather sets a unique atmosphere during the month!

January Temperature in Katsuyama

In January in Katsuyama, the average temperature is -1°C (30°F). Maximum can reach 11°C (53°F), and minimum can be as low as -11°C (13°F). Be prepared for chilly weather and pack accordingly for your trip!

January Weather in Katsuyama: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Katsuyama, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Katsuyama, January typically has an average temperature of -1°C (30°F), with highs reaching up to 11°C (53°F) and lows dropping to around -11°C (13°F).

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

January Precipitation in Katsuyama

In Katsuyama in January, the precipitation amount is 165 mm (6.5 in) spread over 21 days.

January Precipitation Trends in Katsuyama

The chart displays monthly precipitation patterns in Katsuyama, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Katsuyama, January typically receives around 165 mm (6.5 inches) of precipitation spread over approximately 21 days.

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

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Millimeters (mm) Inches (in)

January Humidity in Katsuyama

In Katsuyama in January, humidity is 82%. With an average temperature of -1°C (30°F), this humidity feels like a sharp chill that penetrates your clothing, making travel uncomfortable and dampening your spirit as you navigate through the cold, moisture-laden air.

January Average Humidity in Katsuyama

This chart illustrates the average monthly humidity levels in Katsuyama, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Katsuyama is approximately 82%, offering insight into how humid the weather typically is during this month.

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

January UV Index in Katsuyama

In Katsuyama in January, 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 Katsuyama for better planning.

Maximum UV Index Levels in Katsuyama for January

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

Data source: Katsuyama January 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 January Weather in Katsuyama Compares to Other Months

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

This table compares monthly weather conditions in Katsuyama, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-1°C (30°F)	165 mm (6.5 inches)	82%	moderate
February Weather	-1°C (31°F)	167 mm (6.6 inches)	79%	high
March Weather	4°C (40°F)	191 mm (7.5 inches)	74%	very high
April Weather	9°C (49°F)	216 mm (8.5 inches)	76%	very high
May Weather	15°C (59°F)	201 mm (7.9 inches)	83%	extreme
June Weather	18°C (65°F)	226 mm (8.9 inches)	87%	extreme
July Weather	23°C (73°F)	436 mm (17.2 inches)	93%	extreme
August Weather	24°C (76°F)	304 mm (12.0 inches)	91%	extreme
September Weather	20°C (68°F)	244 mm (9.6 inches)	87%	very high
October Weather	14°C (58°F)	230 mm (9.1 inches)	85%	high
November Weather	8°C (46°F)	127 mm (5.0 inches)	83%	moderate
December Weather	2°C (36°F)	195 mm (7.7 inches)	83%	moderate