January Weather in Tonami, Japan

Last updated: August 23, 2025

In Tonami, Japan, the average temperature in January hovers around 0°C (32°F), with a chill that can plummet to a brisk -11°C (12°F), while a rare warm day might reach as high as 13°C (56°F). Expect 204 mm (8.1 in) of precipitation spread across 21 days, contributing to the 80% average humidity that makes this month feel quite damp.

January Temperature in Tonami

In January in Tonami, the average temperature is 0°C (32°F). Maximums can reach 13°C (56°F), while minimums can drop as low as -11°C (12°F). Be prepared for chilly weather and pack accordingly if you plan to travel during this time.

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

The chart illustrates January temperature patterns in Tonami, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Tonami, January typically has an average temperature of 0°C (32°F), with highs reaching up to 13°C (56°F) and lows dropping to around -11°C (12°F).

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

January Precipitation in Tonami

In Tonami in January, the total precipitation amount is 204 mm (8.1 in) spread over 21 days.

January Precipitation Trends in Tonami

The chart displays monthly precipitation patterns in Tonami, 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 Tonami, January typically receives around 204 mm (8.1 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 Tonami

In Tonami in January humidity is 80%. With an average temperature of 0°C (32°F), this humidity feels like a damp chill clinging to your skin, making every step outside feel uncomfortable and the air heavy, potentially deterring travelers who are unaccustomed to such conditions.

January Average Humidity in Tonami

This chart illustrates the average monthly humidity levels in Tonami, 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 Tonami is approximately 80%, 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 Tonami

In Tonami 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 Tonami for better planning.

Maximum UV Index Levels in Tonami for January

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

Data source: Tonami 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 Tonami Compares to Other Months

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

This table compares monthly weather conditions in Tonami, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	0°C (32°F)	204 mm (8.1 inches)	80%	moderate
February Weather	0°C (33°F)	193 mm (7.6 inches)	78%	high
March Weather	5°C (41°F)	209 mm (8.2 inches)	76%	very high
April Weather	10°C (51°F)	214 mm (8.4 inches)	77%	very high
May Weather	16°C (62°F)	170 mm (6.7 inches)	85%	extreme
June Weather	20°C (67°F)	248 mm (9.8 inches)	89%	extreme
July Weather	24°C (76°F)	424 mm (16.7 inches)	93%	extreme
August Weather	25°C (78°F)	321 mm (12.6 inches)	92%	extreme
September Weather	21°C (70°F)	285 mm (11.2 inches)	84%	very high
October Weather	15°C (59°F)	261 mm (10.3 inches)	81%	high
November Weather	8°C (47°F)	162 mm (6.4 inches)	77%	moderate
December Weather	3°C (37°F)	250 mm (9.8 inches)	79%	moderate