January Weather in Isesaki, Japan

Last updated: August 23, 2025

In January, the average temperature in Isesaki, Japan hovers around 4°C (40°F). Expect chilly nights, with minimums dipping to -8°C (18°F), while daytime highs can reach a comfortable 17°C (63°F). Be prepared for some wet weather, as you'll likely see 44 mm (1.7 in) of precipitation over 6 days. With an average humidity of 88%, the air can feel quite damp, adding to the overall brisk atmosphere.

January Temperature in Isesaki

In January, in Isesaki, the average temperature is 4°C (40°F). Maximum temperatures can reach 17°C (63°F), while minimums can drop to as low as -8°C (18°F). Be prepared for a wide range of temperatures when traveling during this time.

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

The chart illustrates January temperature patterns in Isesaki, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Isesaki, January typically has an average temperature of 4°C (40°F), with highs reaching up to 17°C (63°F) and lows dropping to around -8°C (18°F).

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

January Precipitation in Isesaki

In Isesaki in January, the total precipitation amount is 44 mm (1.7 in) spread over 6 days.

January Precipitation Trends in Isesaki

The chart displays monthly precipitation patterns in Isesaki, 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 Isesaki, January typically receives around 44 mm (1.7 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 Isesaki

In Isesaki in January, humidity is 88%. With an average temperature of 4°C (40°F), this humidity feels like a damp chill that seeps into your bones, making outdoor exploration less enjoyable and prompting you to seek cozy indoor activities instead.

January Average Humidity in Isesaki

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

In Isesaki 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 Isesaki, you can check the information here.

Maximum UV Index Levels in Isesaki for January

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

Data source: Isesaki 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 Isesaki Compares to Other Months

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

This table compares monthly weather conditions in Isesaki, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (40°F)	44 mm (1.7 inches)	88%	moderate
February Weather	5°C (42°F)	42 mm (1.7 inches)	86%	moderate
March Weather	9°C (49°F)	115 mm (4.5 inches)	81%	very high
April Weather	14°C (57°F)	117 mm (4.6 inches)	78%	very high
May Weather	19°C (66°F)	124 mm (4.9 inches)	81%	very high
June Weather	22°C (72°F)	160 mm (6.3 inches)	88%	extreme
July Weather	25°C (78°F)	258 mm (10.2 inches)	92%	extreme
August Weather	27°C (82°F)	148 mm (5.8 inches)	92%	extreme
September Weather	23°C (73°F)	194 mm (7.6 inches)	89%	very high
October Weather	18°C (64°F)	260 mm (10.2 inches)	87%	high
November Weather	12°C (54°F)	43 mm (1.7 inches)	85%	moderate
December Weather	7°C (44°F)	41 mm (1.6 inches)	86%	moderate