January Weather in Iwaki, Japan

Last updated: August 23, 2025

In January, the average temperature in Iwaki, Japan is a brisk 5°C (42°F), with a range that can dip as low as -4°C (26°F) and peak at 14°C (58°F). Expect 57 mm (2.2 in) of precipitation spread over about 6 days, contributing to an average humidity of 76%. Dress warmly and prepare for occasional showers!

January Temperature in Iwaki

In January in Iwaki, the average temperature is 5°C (42°F), with maximums reaching 14°C (58°F) and minimums dropping as low as -4°C (26°F). It’s advisable to pack warm clothing if you plan to visit during this time.

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

The chart illustrates January temperature patterns in Iwaki, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Iwaki, 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 -4°C (26°F).

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

January Precipitation in Iwaki

In Iwaki in January, the precipitation amount is 57 mm (2.2 in) over a span of 6 days.

January Precipitation Trends in Iwaki

The chart displays monthly precipitation patterns in Iwaki, 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 Iwaki, January typically receives around 57 mm (2.2 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 Iwaki

In Iwaki in January humidity is 76%. With an average temperature of 5°C (42°F), this humidity feels like a chilling blanket enveloping you, making travel quite uncomfortable as the dampness seeps into your clothes and lingers on your skin.

January Average Humidity in Iwaki

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

In Iwaki 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 Iwaki, you can check the information here.

Maximum UV Index Levels in Iwaki for January

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

Data source: Iwaki 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 Iwaki Compares to Other Months

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

This table compares monthly weather conditions in Iwaki, 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)	57 mm (2.2 inches)	76%	moderate
February Weather	6°C (42°F)	45 mm (1.8 inches)	75%	moderate
March Weather	8°C (47°F)	169 mm (6.6 inches)	72%	high
April Weather	11°C (53°F)	136 mm (5.4 inches)	73%	very high
May Weather	16°C (61°F)	154 mm (6.1 inches)	80%	very high
June Weather	19°C (66°F)	136 mm (5.3 inches)	87%	very high
July Weather	22°C (72°F)	202 mm (8.0 inches)	92%	extreme
August Weather	25°C (76°F)	137 mm (5.4 inches)	90%	extreme
September Weather	22°C (72°F)	186 mm (7.3 inches)	84%	very high
October Weather	18°C (64°F)	271 mm (10.7 inches)	80%	high
November Weather	13°C (55°F)	85 mm (3.4 inches)	77%	moderate
December Weather	8°C (46°F)	73 mm (2.9 inches)	77%	moderate