January Weather in Shiroishi, Japan

Last updated: August 23, 2025

In Shiroishi, Japan, the average temperature in January hovers around -1°C (31°F). Expect chilly extremes, with minimums dipping to -12°C (11°F) and maximums reaching 9°C (49°F). This month typically sees about 79 mm (3.1 in) of precipitation spread over 16 days, contributing to an average humidity of 76%. Prepare for a brisk and damp atmosphere!

January Temperature in Shiroishi

In January in Shiroishi, the average temperature is -1°C (31°F). The maximum can reach 9°C (49°F), while the minimum can drop as low as -12°C (11°F). Be prepared for cold weather and dress warmly if you plan to travel during this time.

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

The chart illustrates January temperature patterns in Shiroishi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Shiroishi, January typically has an average temperature of -1°C (31°F), with highs reaching up to 9°C (49°F) and lows dropping to around -12°C (11°F).

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

January Precipitation in Shiroishi

In Shiroishi in January, the precipitation amount is 79 mm (3.1 in) over a period of 16 days.

January Precipitation Trends in Shiroishi

The chart displays monthly precipitation patterns in Shiroishi, 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 Shiroishi, January typically receives around 79 mm (3.1 inches) of precipitation spread over approximately 16 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 Shiroishi

In Shiroishi in January, humidity is 76%. With an average temperature of -1°C (31°F), this humidity feels like a frigid chill clinging to your skin, making travel quite uncomfortable as the cold air intensifies the dampness, leaving you feeling even colder than the actual temperature.

January Average Humidity in Shiroishi

This chart illustrates the average monthly humidity levels in Shiroishi, 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 Shiroishi is approximately 76%, 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 Shiroishi

In Shiroishi 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 Shiroishi, you can check the information here.

Maximum UV Index Levels in Shiroishi for January

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

Data source: Shiroishi 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 Shiroishi Compares to Other Months

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

This table compares monthly weather conditions in Shiroishi, 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 (31°F)	79 mm (3.1 inches)	76%	moderate
February Weather	0°C (33°F)	69 mm (2.7 inches)	75%	moderate
March Weather	5°C (41°F)	112 mm (4.4 inches)	72%	high
April Weather	9°C (49°F)	109 mm (4.3 inches)	73%	very high
May Weather	16°C (60°F)	106 mm (4.2 inches)	80%	very high
June Weather	19°C (66°F)	100 mm (3.9 inches)	87%	very high
July Weather	23°C (74°F)	245 mm (9.6 inches)	92%	extreme
August Weather	24°C (76°F)	183 mm (7.2 inches)	90%	extreme
September Weather	20°C (68°F)	140 mm (5.5 inches)	84%	very high
October Weather	14°C (58°F)	194 mm (7.6 inches)	80%	high
November Weather	8°C (47°F)	46 mm (1.8 inches)	77%	moderate
December Weather	2°C (36°F)	87 mm (3.4 inches)	77%	moderate