January Weather in Tarui, Japan

Last updated: August 23, 2025

In January, the average temperature in Tarui, Japan hovers around 4°C (40°F). Expect a chill in the air with minimum temperatures dropping to a brisk -5°C (23°F), while highs can reach a mild 16°C (62°F). Be prepared for some rain, as the area typically sees about 59 mm (2.3 in) of precipitation over 9 days, accompanied by a notable humidity level of 82%.

January Temperature in Tarui

In January in Tarui, the average temperature is 4°C (40°F). Maximum temperatures can reach 16°C (62°F), while minimum temperatures can drop to as low as -5°C (23°F). Travelers should be prepared for cool conditions and pack accordingly for fluctuating temperatures.

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

The chart illustrates January temperature patterns in Tarui, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Tarui, January typically has an average temperature of 4°C (40°F), with highs reaching up to 16°C (62°F) and lows dropping to around -5°C (23°F).

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

January Precipitation in Tarui

In Tarui in January, the precipitation amount is 59 mm (2.3 in) over the course of 9 days.

January Precipitation Trends in Tarui

The chart displays monthly precipitation patterns in Tarui, 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 Tarui, January typically receives around 59 mm (2.3 inches) of precipitation spread over approximately 9 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 Tarui

In Tarui in January, humidity is 82%. With an average temperature of 4°C (40°F), this humidity feels like a chilly dampness that lingers in the air, making travel slightly uncomfortable as the cold penetrates through layers of clothing, often leaving you feeling chilled and clammy.

January Average Humidity in Tarui

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

In Tarui 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 Tarui for better planning.

Maximum UV Index Levels in Tarui for January

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

Data source: Tarui 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 Tarui Compares to Other Months

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

This table compares monthly weather conditions in Tarui, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (40°F)	59 mm (2.3 inches)	82%	moderate
February Weather	5°C (41°F)	63 mm (2.5 inches)	79%	high
March Weather	9°C (49°F)	150 mm (5.9 inches)	74%	very high
April Weather	14°C (57°F)	167 mm (6.6 inches)	76%	very high
May Weather	19°C (66°F)	189 mm (7.4 inches)	83%	extreme
June Weather	22°C (72°F)	204 mm (8.0 inches)	87%	extreme
July Weather	26°C (79°F)	388 mm (15.3 inches)	93%	extreme
August Weather	28°C (82°F)	262 mm (10.3 inches)	91%	extreme
September Weather	24°C (75°F)	228 mm (9.0 inches)	87%	very high
October Weather	18°C (65°F)	260 mm (10.3 inches)	85%	high
November Weather	12°C (54°F)	60 mm (2.4 inches)	83%	moderate
December Weather	7°C (44°F)	78 mm (3.1 inches)	83%	moderate