January Weather in Tosu, Japan

Last updated: August 23, 2025

In January, the average temperature in Tosu, Japan hovers around 6°C (43°F). Expect chilly nights with a minimum temperature plummeting to -4°C (25°F), while daytime highs can reach a pleasant 17°C (63°F). Be prepared for some wet days, as 54 mm (2.1 in) of precipitation is expected over approximately 7 days. With an average humidity of 75%, you'll definitely feel the moisture in the air!

January Temperature in Tosu

In January in Tosu, the average temperature is 6°C (43°F). The maximum can reach 17°C (63°F), and the minimum can be as low as -4°C (25°F). It's advisable to pack layers to ensure comfort during your travels, as temperatures can vary significantly throughout the day.

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

The chart illustrates January temperature patterns in Tosu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Tosu, January typically has an average temperature of 6°C (43°F), with highs reaching up to 17°C (63°F) and lows dropping to around -4°C (25°F).

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

January Precipitation in Tosu

In Tosu in January, the precipitation amount is 54 mm (2.1 in) over a duration of 7 days.

January Precipitation Trends in Tosu

The chart displays monthly precipitation patterns in Tosu, 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 Tosu, January typically receives around 54 mm (2.1 inches) of precipitation spread over approximately 7 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in Tosu

In Tosu in January, humidity is 75%. With an average temperature of 6°C (43°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and urging you to seek shelter indoors more often than not.

January Average Humidity in Tosu

This chart illustrates the average monthly humidity levels in Tosu, 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 Tosu is approximately 75%, 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 Tosu

In Tosu 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 Tosu for better planning.

Maximum UV Index Levels in Tosu for January

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

Data source: Tosu 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 Tosu Compares to Other Months

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

This table compares monthly weather conditions in Tosu, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	6°C (43°F)	54 mm (2.1 inches)	75%	moderate
February Weather	7°C (44°F)	85 mm (3.4 inches)	71%	high
March Weather	11°C (52°F)	133 mm (5.2 inches)	71%	very high
April Weather	15°C (59°F)	124 mm (4.9 inches)	78%	extreme
May Weather	20°C (68°F)	200 mm (7.9 inches)	84%	extreme
June Weather	23°C (74°F)	233 mm (9.2 inches)	86%	extreme
July Weather	27°C (80°F)	450 mm (17.7 inches)	92%	extreme
August Weather	28°C (82°F)	331 mm (13.0 inches)	91%	extreme
September Weather	24°C (76°F)	209 mm (8.2 inches)	84%	extreme
October Weather	19°C (66°F)	120 mm (4.7 inches)	83%	high
November Weather	13°C (55°F)	57 mm (2.2 inches)	81%	high
December Weather	7°C (46°F)	71 mm (2.8 inches)	79%	moderate