January Weather in Nagaoka, Japan

Last updated: August 23, 2025

In January, the average temperature in Nagaoka, Japan hovers around 2°C (37°F). Temperature fluctuations can be quite extreme, with a minimum dropping to -10°C (14°F) and a maximum reaching 13°C (55°F). Expect 165 mm (6.5 in) of precipitation spread over 21 days, and be prepared for high humidity at an average of 88%.

January Temperature in Nagaoka

In January in Nagaoka, the average temperature is 2°C (37°F). Maximums can reach 13°C (55°F) and minimums can be as low as -10°C (14°F). Travelers should be prepared for chilly weather and pack accordingly to stay warm.

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

The chart illustrates January temperature patterns in Nagaoka, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Nagaoka, January typically has an average temperature of 2°C (37°F), with highs reaching up to 13°C (55°F) and lows dropping to around -10°C (14°F).

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

January Precipitation in Nagaoka

In Nagaoka in January, the precipitation amount is 165 mm (6.5 in) spread over 21 days.

January Precipitation Trends in Nagaoka

The chart displays monthly precipitation patterns in Nagaoka, 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 Nagaoka, January typically receives around 165 mm (6.5 inches) of precipitation spread over approximately 21 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 Nagaoka

In Nagaoka in January, humidity is 88%. With an average temperature of 2°C (37°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities uncomfortable and travel less enjoyable.

January Average Humidity in Nagaoka

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

In Nagaoka 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 Nagaoka, you can check the information here.

Maximum UV Index Levels in Nagaoka for January

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

Data source: Nagaoka 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 Nagaoka Compares to Other Months

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

This table compares monthly weather conditions in Nagaoka, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	2°C (37°F)	165 mm (6.5 inches)	88%	moderate
February Weather	3°C (38°F)	138 mm (5.4 inches)	86%	moderate
March Weather	7°C (45°F)	130 mm (5.1 inches)	81%	high
April Weather	12°C (53°F)	114 mm (4.5 inches)	78%	very high
May Weather	18°C (64°F)	110 mm (4.3 inches)	81%	very high
June Weather	21°C (71°F)	108 mm (4.3 inches)	88%	very high
July Weather	26°C (79°F)	283 mm (11.2 inches)	92%	extreme
August Weather	27°C (82°F)	186 mm (7.3 inches)	92%	extreme
September Weather	23°C (73°F)	151 mm (5.9 inches)	89%	very high
October Weather	17°C (63°F)	158 mm (6.2 inches)	87%	high
November Weather	11°C (52°F)	139 mm (5.5 inches)	85%	moderate
December Weather	5°C (41°F)	204 mm (8.0 inches)	86%	moderate