January Weather in Niihama, Japan

Last updated: August 23, 2025

In January, the average temperature in Niihama, Japan hovers around 5°C (42°F). Expect chilly moments with minimums dipping to -3°C (27°F) and pleasant highs reaching 14°C (58°F). Precipitation is a common occurrence, with 65 mm (2.6 in) falling over 11 days, contributing to an average humidity level of 74%. Prepare accordingly for a mix of cool temperatures and occasional rain!

January Temperature in Niihama

In January in Niihama, the average temperature is 5°C (42°F). The maximum can reach 14°C (58°F) and the minimum can be as low as -3°C (27°F). It's advisable to pack layers to stay comfortable during your travels.

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

The chart illustrates January temperature patterns in Niihama, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Niihama, January typically has an average temperature of 5°C (42°F), with highs reaching up to 14°C (58°F) and lows dropping to around -3°C (27°F).

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

January Precipitation in Niihama

In Niihama in January, the precipitation amount is 65 mm (2.6 in) over a span of 11 days.

January Precipitation Trends in Niihama

The chart displays monthly precipitation patterns in Niihama, 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 Niihama, January typically receives around 65 mm (2.6 inches) of precipitation spread over approximately 11 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 Niihama

In Niihama in January, humidity is 74%. With an average temperature of 5°C (42°F), this humidity feels like a damp chill that penetrates your clothes, making outdoor activities somewhat uncomfortable and necessitating extra layers to keep warm while exploring.

January Average Humidity in Niihama

This chart illustrates the average monthly humidity levels in Niihama, 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 Niihama is approximately 74%, 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 Niihama

In Niihama 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 Niihama for better planning.

Maximum UV Index Levels in Niihama for January

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

Data source: Niihama 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 Niihama Compares to Other Months

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

This table compares monthly weather conditions in Niihama, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (42°F)	65 mm (2.6 inches)	74%	moderate
February Weather	6°C (43°F)	85 mm (3.4 inches)	70%	high
March Weather	9°C (49°F)	129 mm (5.1 inches)	70%	very high
April Weather	13°C (57°F)	142 mm (5.6 inches)	76%	very high
May Weather	18°C (65°F)	148 mm (5.8 inches)	82%	extreme
June Weather	22°C (71°F)	199 mm (7.8 inches)	86%	extreme
July Weather	26°C (79°F)	357 mm (14.1 inches)	91%	extreme
August Weather	27°C (82°F)	181 mm (7.1 inches)	88%	extreme
September Weather	24°C (75°F)	237 mm (9.3 inches)	85%	very high
October Weather	19°C (66°F)	253 mm (10.0 inches)	82%	high
November Weather	13°C (56°F)	69 mm (2.7 inches)	79%	high
December Weather	8°C (46°F)	80 mm (3.1 inches)	77%	moderate