January Weather in Isen, Japan

Last updated: August 23, 2025

In January, the average temperature in Isen, Japan is a pleasant 17°C (63°F). Expect minimums dipping to 11°C (51°F) and maximums rising to 23°C (73°F). During this month, Isen typically experiences 109 mm (4.3 in) of precipitation, spread over approximately 12 days, resulting in an average humidity of 71%. Embrace the mild weather and prepare for a blend of sunshine and rain!

January Temperature in Isen

In January in Isen, the average temperature is 17°C (63°F). The maximum can reach 23°C (73°F), and the minimum can be as low as 11°C (51°F). This mild climate makes Isen an ideal destination for outdoor activities and sightseeing.

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

The chart illustrates January temperature patterns in Isen, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Isen, January typically has an average temperature of 17°C (63°F), with highs reaching up to 23°C (73°F) and lows dropping to around 11°C (51°F).

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

January Precipitation in Isen

In Isen in January, the total precipitation amount is 109 mm (4.3 in) during a span of 12 days.

January Precipitation Trends in Isen

The chart displays monthly precipitation patterns in Isen, 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 Isen, January typically receives around 109 mm (4.3 inches) of precipitation spread over approximately 12 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 Isen

In Isen in January, humidity is 71%. With an average temperature of 17°C (63°F), this humidity feels like a warm embrace, making outdoor activities enjoyable yet a bit sticky, so travelers should stay hydrated and take breaks in the shade.

January Average Humidity in Isen

This chart illustrates the average monthly humidity levels in Isen, 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 Isen is approximately 71%, 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 Isen

In Isen in January, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Isen, you can refer to this Hourly UV Index in Isen.

Maximum UV Index Levels in Isen for January

The chart shows the monthly maximum UV Index (UVI) for Isen 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 Isen typically reaches 6, which falls under the high exposure category.

Data source: Isen 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 Isen Compares to Other Months

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

This table compares monthly weather conditions in Isen, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	17°C (63°F)	109 mm (4.3 inches)	71%	high
February Weather	17°C (63°F)	117 mm (4.6 inches)	71%	very high
March Weather	19°C (66°F)	153 mm (6.0 inches)	76%	extreme
April Weather	20°C (69°F)	114 mm (4.5 inches)	82%	extreme
May Weather	23°C (74°F)	192 mm (7.5 inches)	84%	extreme
June Weather	26°C (78°F)	456 mm (17.9 inches)	86%	extreme
July Weather	28°C (82°F)	208 mm (8.2 inches)	86%	extreme
August Weather	28°C (83°F)	150 mm (5.9 inches)	82%	extreme
September Weather	28°C (82°F)	211 mm (8.3 inches)	82%	extreme
October Weather	25°C (78°F)	137 mm (5.4 inches)	80%	very high
November Weather	22°C (72°F)	130 mm (5.1 inches)	79%	very high
December Weather	19°C (66°F)	127 mm (5.0 inches)	75%	high