January Weather in Tomamae, Japan

Last updated: August 23, 2025

In January, the average temperature in Tomamae, Japan hovers around -5°C (24°F), with extremes ranging from a chilly -18°C (0°F) to a mild 5°C (42°F). Expect 67 mm (2.6 in) of precipitation spread over 18 days, contributing to an average humidity of a damp 87%.

January Temperature in Tomamae

In January in Tomamae, the average temperature is -5°C (24°F). Maximums can reach 5°C (42°F) and minimums can be as low as -18°C (0°F). Be sure to pack warm clothing and plan indoor activities while visiting during this chilly time of year.

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

The chart illustrates January temperature patterns in Tomamae, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Tomamae, January typically has an average temperature of -5°C (24°F), with highs reaching up to 5°C (42°F) and lows dropping to around -18°C (0°F).

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

January Precipitation in Tomamae

In Tomamae in January, the total precipitation amount is 67 mm (2.6 in), spread over 18 days.

January Precipitation Trends in Tomamae

The chart displays monthly precipitation patterns in Tomamae, 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 Tomamae, January typically receives around 67 mm (2.6 inches) of precipitation spread over approximately 18 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 Tomamae

In Tomamae in January humidity is 87%. With an average temperature of -5°C (24°F), this humidity feels like an icy embrace that makes the cold penetrate deeper into your bones, adding a chilling dampness that can quickly dampen the spirits of even the most seasoned travelers.

January Average Humidity in Tomamae

This chart illustrates the average monthly humidity levels in Tomamae, 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 Tomamae is approximately 87%, 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 Tomamae

In Tomamae in January, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Tomamae, you can visit Hourly UV Index in Tomamae.

Maximum UV Index Levels in Tomamae for January

The chart shows the monthly maximum UV Index (UVI) for Tomamae 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 Tomamae typically reaches 2, which falls under the low exposure category.

Data source: Tomamae 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 Tomamae Compares to Other Months

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

This table compares monthly weather conditions in Tomamae, 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 (24°F)	67 mm (2.6 inches)	87%	low
February Weather	-4°C (25°F)	80 mm (3.1 inches)	84%	moderate
March Weather	1°C (34°F)	78 mm (3.1 inches)	83%	moderate
April Weather	6°C (43°F)	65 mm (2.6 inches)	84%	high
May Weather	11°C (52°F)	79 mm (3.1 inches)	88%	very high
June Weather	15°C (59°F)	87 mm (3.4 inches)	88%	very high
July Weather	21°C (69°F)	96 mm (3.8 inches)	93%	very high
August Weather	21°C (70°F)	158 mm (6.2 inches)	94%	very high
September Weather	18°C (65°F)	84 mm (3.3 inches)	86%	high
October Weather	12°C (54°F)	150 mm (5.9 inches)	79%	moderate
November Weather	6°C (42°F)	154 mm (6.1 inches)	77%	moderate
December Weather	-1°C (30°F)	124 mm (4.9 inches)	83%	low