January Weather in Iwanuma, Japan

Last updated: August 23, 2025

In Iwanuma, Japan, the average temperature in January hovers around 1°C (34°F), with a minimum dipping to -9°C (17°F) and a maximum reaching 12°C (53°F). Expect a total precipitation of 58 mm (2.3 in) spread over 11 days, contributing to a humidity level of 76%. Prepare for a cool, damp month!

January Temperature in Iwanuma

In January in Iwanuma, the average temperature is 1°C (34°F), with maximums reaching 12°C (53°F) and minimums dipping as low as -9°C (17°F). Travelers should be prepared for chilly conditions and pack accordingly for a variety of weather.

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

The chart illustrates January temperature patterns in Iwanuma, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Iwanuma, January typically has an average temperature of 1°C (34°F), with highs reaching up to 12°C (53°F) and lows dropping to around -9°C (17°F).

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

January Precipitation in Iwanuma

In Iwanuma in January, the precipitation amount is 58 mm (2.3 in) over the course of 11 days.

January Precipitation Trends in Iwanuma

The chart displays monthly precipitation patterns in Iwanuma, 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 Iwanuma, January typically receives around 58 mm (2.3 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 Iwanuma

In Iwanuma in January humidity is 76%. With an average temperature of 1°C (34°F), this humidity feels like a damp chill that clings to your skin, making every step outside feel heavier and more exhausting for traveling.

January Average Humidity in Iwanuma

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

In Iwanuma 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 Iwanuma, you can check the information here.

Maximum UV Index Levels in Iwanuma for January

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

Data source: Iwanuma 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 Iwanuma Compares to Other Months

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

This table compares monthly weather conditions in Iwanuma, 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 (34°F)	58 mm (2.3 inches)	76%	moderate
February Weather	2°C (36°F)	46 mm (1.8 inches)	75%	moderate
March Weather	6°C (43°F)	112 mm (4.4 inches)	72%	high
April Weather	10°C (50°F)	109 mm (4.3 inches)	73%	very high
May Weather	16°C (61°F)	116 mm (4.6 inches)	80%	very high
June Weather	19°C (66°F)	105 mm (4.1 inches)	87%	very high
July Weather	23°C (74°F)	252 mm (9.9 inches)	92%	extreme
August Weather	25°C (77°F)	203 mm (8.0 inches)	90%	very high
September Weather	21°C (70°F)	173 mm (6.8 inches)	84%	very high
October Weather	15°C (60°F)	233 mm (9.2 inches)	80%	high
November Weather	10°C (49°F)	37 mm (1.5 inches)	77%	moderate
December Weather	4°C (39°F)	59 mm (2.3 inches)	77%	moderate