January Weather in Omachi, Japan

Last updated: August 23, 2025

In January, the average temperature in Omachi, Japan hovers around -8°C (19°F), with lows reaching as frigid as -18°C (-1°F) and highs peaking at 4°C (40°F). During this month, precipitation is noteworthy, amounting to 193 mm (7.6 in) spread over 21 days, creating a damp atmosphere with an average humidity of 88%.

January Temperature in Omachi

In January in Omachi, the average temperature is -8°C (19°F). The maximum can reach 4°C (40°F), while the minimum can drop to as low as -18°C (-1°F). Travelers should be prepared for cold weather and pack accordingly for their trip.

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

The chart illustrates January temperature patterns in Omachi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Omachi, January typically has an average temperature of -8°C (19°F), with highs reaching up to 4°C (40°F) and lows dropping to around -18°C (-1°F).

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

January Precipitation in Omachi

In Omachi in January, the precipitation amount is 193 mm (7.6 in) spread over 21 days.

January Precipitation Trends in Omachi

The chart displays monthly precipitation patterns in Omachi, 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 Omachi, January typically receives around 193 mm (7.6 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 Omachi

In Omachi in January, humidity is 88%. With an average temperature of -8°C (19°F), this humidity feels like a thick, biting chill that seeps into your bones, making travel quite uncomfortable and demanding extra layers to stay warm and dry.

January Average Humidity in Omachi

This chart illustrates the average monthly humidity levels in Omachi, 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 Omachi is approximately 88%, 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 Omachi

In Omachi 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 Omachi for better planning.

Maximum UV Index Levels in Omachi for January

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

Data source: Omachi 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 Omachi Compares to Other Months

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

This table compares monthly weather conditions in Omachi, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-8°C (19°F)	193 mm (7.6 inches)	88%	moderate
February Weather	-7°C (20°F)	181 mm (7.1 inches)	86%	high
March Weather	-1°C (30°F)	198 mm (7.8 inches)	81%	very high
April Weather	4°C (39°F)	226 mm (8.9 inches)	78%	very high
May Weather	11°C (52°F)	276 mm (10.9 inches)	81%	extreme
June Weather	15°C (59°F)	310 mm (12.2 inches)	88%	extreme
July Weather	19°C (67°F)	565 mm (22.3 inches)	92%	extreme
August Weather	20°C (69°F)	400 mm (15.8 inches)	92%	extreme
September Weather	16°C (61°F)	334 mm (13.1 inches)	89%	very high
October Weather	10°C (50°F)	284 mm (11.2 inches)	87%	high
November Weather	3°C (37°F)	139 mm (5.5 inches)	85%	moderate
December Weather	-5°C (24°F)	206 mm (8.1 inches)	86%	moderate