January Weather in Arai, Japan

Last updated: August 23, 2025

In January, the average temperature in Arai, Japan hovers around 0°C (32°F), with a minimum of -9°C (16°F) and a maximum reaching up to 11°C (52°F). Expect significant rainfall, totaling 227 mm (8.9 in) over 22 days, along with high humidity levels averaging 88%. Prepare for a wet and chilly month!

January Temperature in Arai

In January in Arai, the average temperature is 0°C (32°F), with a maximum that can reach 11°C (52°F) and a minimum that can be as low as -9°C (16°F). Be sure to pack warm clothing and be prepared for chilly weather during your travels.

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

The chart illustrates January temperature patterns in Arai, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Arai, January typically has an average temperature of 0°C (32°F), with highs reaching up to 11°C (52°F) and lows dropping to around -9°C (16°F).

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

January Precipitation in Arai

In Arai in January, the precipitation amount reaches 227 mm (8.9 in) over the course of 22 days.

January Precipitation Trends in Arai

The chart displays monthly precipitation patterns in Arai, 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 Arai, January typically receives around 227 mm (8.9 inches) of precipitation spread over approximately 22 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 Arai

In Arai in January, humidity is 88%. With an average temperature of 0°C (32°F), this humidity feels like a chilly, damp blanket enveloping you, making travel uncomfortable as every breath seems to carry the weight of the cold moisture, turning each step into a struggle against the biting chill.

January Average Humidity in Arai

This chart illustrates the average monthly humidity levels in Arai, 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 Arai is approximately 88%, 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 Arai

In Arai 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 Arai, you can check the information here.

Maximum UV Index Levels in Arai for January

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

Data source: Arai 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 Arai Compares to Other Months

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

This table compares monthly weather conditions in Arai, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	0°C (32°F)	227 mm (8.9 inches)	88%	moderate
February Weather	0°C (33°F)	188 mm (7.4 inches)	86%	moderate
March Weather	4°C (40°F)	149 mm (5.8 inches)	81%	very high
April Weather	9°C (49°F)	146 mm (5.8 inches)	78%	very high
May Weather	16°C (60°F)	152 mm (6.0 inches)	81%	very high
June Weather	19°C (66°F)	173 mm (6.8 inches)	88%	extreme
July Weather	23°C (75°F)	353 mm (13.9 inches)	92%	extreme
August Weather	25°C (77°F)	210 mm (8.3 inches)	92%	extreme
September Weather	20°C (69°F)	207 mm (8.2 inches)	89%	very high
October Weather	15°C (59°F)	235 mm (9.3 inches)	87%	high
November Weather	8°C (48°F)	144 mm (5.7 inches)	85%	moderate
December Weather	2°C (37°F)	247 mm (9.7 inches)	86%	moderate