January Weather in Koshimizu, Japan

Last updated: August 23, 2025

In January, the average temperature in Koshimizu, Japan hovers around -7°C (19°F). Expect chilly conditions, with minimum temperatures potentially dropping to -20°C (-4°F) and highs reaching up to 6°C (43°F). Additionally, 54 mm (2.1 in) of precipitation is likely over 12 days, while the air remains quite humid with an average humidity of 84%. Stay warm and prepared for the elements!

January Temperature in Koshimizu

In January in Koshimizu, the average temperature is -7°C (19°F), with maximums reaching 6°C (43°F) and minimums dropping as low as -20°C (-4°F). Travelers should be prepared for cold conditions and dress warmly to fully enjoy their visit.

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

The chart illustrates January temperature patterns in Koshimizu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Koshimizu, January typically has an average temperature of -7°C (19°F), with highs reaching up to 6°C (43°F) and lows dropping to around -20°C (-4°F).

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

January Precipitation in Koshimizu

In Koshimizu in January, the total precipitation amount is 54 mm (2.1 in) spread over a period of 12 days.

January Precipitation Trends in Koshimizu

The chart displays monthly precipitation patterns in Koshimizu, 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 Koshimizu, January typically receives around 54 mm (2.1 inches) of precipitation spread over approximately 12 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 Koshimizu

In Koshimizu in January humidity is 84%. With an average temperature of -7°C (19°F), this humidity feels like a biting chill that cuts through layers of clothing, making outdoor travel uncomfortable and prompting a need for frequent warm breaks indoors.

January Average Humidity in Koshimizu

This chart illustrates the average monthly humidity levels in Koshimizu, 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 Koshimizu is approximately 84%, 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 Koshimizu

In Koshimizu in January, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Koshimizu, you can visit Hourly UV Index in Koshimizu.

Maximum UV Index Levels in Koshimizu for January

The chart shows the monthly maximum UV Index (UVI) for Koshimizu 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 Koshimizu typically reaches 2, which falls under the low exposure category.

Data source: Koshimizu 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 Koshimizu Compares to Other Months

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

This table compares monthly weather conditions in Koshimizu, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-7°C (19°F)	54 mm (2.1 inches)	84%	low
February Weather	-8°C (19°F)	55 mm (2.2 inches)	83%	moderate
March Weather	-2°C (29°F)	88 mm (3.5 inches)	83%	high
April Weather	4°C (39°F)	72 mm (2.8 inches)	83%	high
May Weather	10°C (50°F)	95 mm (3.7 inches)	86%	very high
June Weather	13°C (56°F)	96 mm (3.8 inches)	88%	very high
July Weather	18°C (64°F)	79 mm (3.1 inches)	93%	very high
August Weather	18°C (65°F)	129 mm (5.1 inches)	96%	very high
September Weather	16°C (61°F)	95 mm (3.7 inches)	89%	very high
October Weather	11°C (51°F)	159 mm (6.2 inches)	83%	moderate
November Weather	4°C (40°F)	96 mm (3.8 inches)	80%	moderate
December Weather	-3°C (27°F)	70 mm (2.8 inches)	79%	low