January Weather in Oma, Japan

Last updated: August 23, 2025

In January, the average temperature in Oma, Japan hovers around 1°C (34°F). While it can dip as low as -7°C (20°F), you might also enjoy the occasional warmer day, with highs reaching 10°C (49°F). Be prepared for wet weather, as 117 mm (4.6 in) of precipitation typically falls over about 20 days. With an average humidity of 79%, it's a month where you'll definitely feel the chill!

January Temperature in Oma

In January in Oma, the average temperature is 1°C (34°F). Maximum temperatures can reach up to 10°C (49°F), while the minimum can drop as low as -7°C (20°F). It’s essential to pack warm clothing and be prepared for chilly conditions if you're traveling during this time.

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

The chart illustrates January temperature patterns in Oma, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Oma, January typically has an average temperature of 1°C (34°F), with highs reaching up to 10°C (49°F) and lows dropping to around -7°C (20°F).

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

January Precipitation in Oma

In Oma in January, the total precipitation amount is 117 mm (4.6 in) over a span of 20 days.

January Precipitation Trends in Oma

The chart displays monthly precipitation patterns in Oma, 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 Oma, January typically receives around 117 mm (4.6 inches) of precipitation spread over approximately 20 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 Oma

In Oma in January, humidity is 79%. With an average temperature of 1°C (34°F), this humidity feels like an icy blanket wrapping around you, making travel particularly brisk and requiring extra layers to stay warm and comfortable.

January Average Humidity in Oma

This chart illustrates the average monthly humidity levels in Oma, 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 Oma is approximately 79%, 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 Oma

In Oma 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 Oma, you can visit Hourly UV Index in Oma.

Maximum UV Index Levels in Oma for January

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

Data source: Oma 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 Oma Compares to Other Months

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

This table compares monthly weather conditions in Oma, 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)	117 mm (4.6 inches)	79%	low
February Weather	1°C (34°F)	115 mm (4.5 inches)	78%	moderate
March Weather	4°C (40°F)	94 mm (3.7 inches)	77%	moderate
April Weather	7°C (46°F)	97 mm (3.8 inches)	78%	very high
May Weather	11°C (52°F)	95 mm (3.8 inches)	86%	very high
June Weather	14°C (58°F)	107 mm (4.2 inches)	91%	very high
July Weather	19°C (66°F)	100 mm (3.9 inches)	95%	very high
August Weather	21°C (71°F)	171 mm (6.7 inches)	97%	extreme
September Weather	20°C (69°F)	116 mm (4.6 inches)	89%	very high
October Weather	16°C (61°F)	159 mm (6.3 inches)	81%	high
November Weather	9°C (49°F)	133 mm (5.2 inches)	78%	moderate
December Weather	3°C (38°F)	167 mm (6.6 inches)	77%	low