January Weather in Isawa, Japan

Last updated: August 23, 2025

In January, the average temperature in Isawa, Japan hovers around -1°C (31°F). While it can dip as low as -17°C (2°F), the temperature can occasionally reach a maximum of 11°C (52°F). You'll also want to prepare for some rain, with 48 mm (1.9 in) of precipitation expected over 6 days. The air will feel quite humid, with an average humidity level of 76%.

January Temperature in Isawa

In January in Isawa, the average temperature is -1°C (31°F), with maximums that can reach 11°C (52°F) and minimums that can drop as low as -17°C (2°F). Be prepared for chilly conditions and pack accordingly to enjoy your travels in this winter wonderland.

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

The chart illustrates January temperature patterns in Isawa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Isawa, January typically has an average temperature of -1°C (31°F), with highs reaching up to 11°C (52°F) and lows dropping to around -17°C (2°F).

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

January Precipitation in Isawa

In Isawa in January, the precipitation amount is 48 mm (1.9 in) distributed over 6 days.

January Precipitation Trends in Isawa

The chart displays monthly precipitation patterns in Isawa, 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 Isawa, January typically receives around 48 mm (1.9 inches) of precipitation spread over approximately 6 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 Isawa

In Isawa 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 Isawa

This chart illustrates the average monthly humidity levels in Isawa, 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 Isawa 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 Isawa

In Isawa 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 Isawa for better planning.

Maximum UV Index Levels in Isawa for January

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

Data source: Isawa 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 Isawa Compares to Other Months

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

This table compares monthly weather conditions in Isawa, 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)	48 mm (1.9 inches)	76%	moderate
February Weather	0°C (33°F)	58 mm (2.3 inches)	74%	high
March Weather	5°C (41°F)	144 mm (5.7 inches)	70%	very high
April Weather	9°C (48°F)	138 mm (5.4 inches)	74%	very high
May Weather	14°C (58°F)	148 mm (5.8 inches)	81%	extreme
June Weather	17°C (63°F)	179 mm (7.1 inches)	88%	extreme
July Weather	21°C (70°F)	320 mm (12.6 inches)	93%	extreme
August Weather	23°C (73°F)	190 mm (7.5 inches)	90%	extreme
September Weather	18°C (65°F)	208 mm (8.2 inches)	86%	very high
October Weather	13°C (55°F)	324 mm (12.8 inches)	83%	high
November Weather	7°C (45°F)	56 mm (2.2 inches)	80%	moderate
December Weather	2°C (36°F)	52 mm (2.1 inches)	78%	moderate