January Weather in Ishii, Japan

Last updated: August 23, 2025

In January, the average temperature in Ishii, Japan hovers around 6°C (43°F), with minimums dipping to -3°C (27°F) and maximums rising to 16°C (61°F). Expect about 60 mm (2.4 in) of precipitation spread over 5 days, and brace for a 74% average humidity, creating a distinctly crisp and humid atmosphere.

January Temperature in Ishii

In January in Ishii, the average temperature is 6°C (43°F). The maximum can reach 16°C (61°F) and the minimum can be as low as -3°C (27°F). Be prepared for a mix of mild and chilly weather when traveling during this time.

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

The chart illustrates January temperature patterns in Ishii, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ishii, January typically has an average temperature of 6°C (43°F), with highs reaching up to 16°C (61°F) and lows dropping to around -3°C (27°F).

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

January Precipitation in Ishii

In Ishii in January, the total precipitation amount is 60 mm (2.4 in) over a span of 5 days.

January Precipitation Trends in Ishii

The chart displays monthly precipitation patterns in Ishii, 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 Ishii, January typically receives around 60 mm (2.4 inches) of precipitation spread over approximately 5 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 Ishii

In Ishii in January, humidity is 74%. With an average temperature of 6°C (43°F), this humidity feels like a damp chill that permeates your clothes, making outdoor activities less enjoyable and requiring extra layers to stay comfortable while exploring.

January Average Humidity in Ishii

This chart illustrates the average monthly humidity levels in Ishii, 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 Ishii is approximately 74%, 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 Ishii

In Ishii 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 Ishii for better planning.

Maximum UV Index Levels in Ishii for January

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

Data source: Ishii 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 Ishii Compares to Other Months

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

This table compares monthly weather conditions in Ishii, 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)	60 mm (2.4 inches)	74%	moderate
February Weather	7°C (44°F)	71 mm (2.8 inches)	70%	high
March Weather	10°C (51°F)	137 mm (5.4 inches)	70%	very high
April Weather	14°C (57°F)	145 mm (5.7 inches)	76%	extreme
May Weather	18°C (65°F)	184 mm (7.3 inches)	82%	extreme
June Weather	21°C (71°F)	234 mm (9.2 inches)	86%	extreme
July Weather	26°C (78°F)	378 mm (14.9 inches)	91%	extreme
August Weather	27°C (81°F)	226 mm (8.9 inches)	88%	extreme
September Weather	24°C (75°F)	294 mm (11.6 inches)	85%	very high
October Weather	19°C (67°F)	360 mm (14.2 inches)	82%	high
November Weather	14°C (57°F)	65 mm (2.5 inches)	79%	high
December Weather	9°C (48°F)	64 mm (2.5 inches)	77%	moderate