January Weather in Kosaka, Japan

Last updated: August 23, 2025

In January, the average temperature in Kosaka, Japan hovers around -3°C (26°F), with a minimum dropping to a chilly -21°C (-6°F) and a maximum reaching a mild 5°C (41°F). This month witnesses an average precipitation of 78 mm (3.1 in) over approximately 17 days, accompanied by a high average humidity of 79%. Prepare for a brisk and potentially wet winter experience!

January Temperature in Kosaka

In January in Kosaka, the average temperature is -3°C (26°F), with maximums reaching 5°C (41°F) and minimums plummeting as low as -21°C (-6°F). Travelers should prepare for cold weather conditions and dress in warm layers when visiting.

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

The chart illustrates January temperature patterns in Kosaka, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kosaka, January typically has an average temperature of -3°C (26°F), with highs reaching up to 5°C (41°F) and lows dropping to around -21°C (-6°F).

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

January Precipitation in Kosaka

In Kosaka in January, the precipitation amount is 78 mm (3.1 in) over a span of 17 days.

January Precipitation Trends in Kosaka

The chart displays monthly precipitation patterns in Kosaka, 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 Kosaka, January typically receives around 78 mm (3.1 inches) of precipitation spread over approximately 17 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 Kosaka

In Kosaka in January, humidity is 79%. With an average temperature of -3°C (26°F), this humidity feels like a biting chill that seeps into your bones, making outdoor exploration brisk and invigorating, yet challenging for those unaccustomed to the cold dampness.

January Average Humidity in Kosaka

This chart illustrates the average monthly humidity levels in Kosaka, 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 Kosaka is approximately 79%, 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 Kosaka

In Kosaka in January, 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 Kosaka, you can check the information here.

Maximum UV Index Levels in Kosaka for January

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

Data source: Kosaka 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 Kosaka Compares to Other Months

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

This table compares monthly weather conditions in Kosaka, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-3°C (26°F)	78 mm (3.1 inches)	79%	moderate
February Weather	-3°C (28°F)	108 mm (4.3 inches)	78%	moderate
March Weather	2°C (35°F)	107 mm (4.2 inches)	77%	high
April Weather	7°C (45°F)	127 mm (5.0 inches)	78%	very high
May Weather	14°C (57°F)	116 mm (4.6 inches)	86%	very high
June Weather	17°C (63°F)	142 mm (5.6 inches)	91%	very high
July Weather	22°C (71°F)	168 mm (6.6 inches)	95%	very high
August Weather	22°C (73°F)	179 mm (7.1 inches)	97%	extreme
September Weather	18°C (65°F)	137 mm (5.4 inches)	89%	very high
October Weather	12°C (54°F)	166 mm (6.5 inches)	81%	high
November Weather	6°C (42°F)	100 mm (4.0 inches)	78%	moderate
December Weather	-1°C (30°F)	114 mm (4.5 inches)	77%	low