January Weather in Oyama, Japan

Last updated: August 23, 2025

In January, the average temperature in Oyama, Japan hovers around 10°C (49°F). Expect a minimum of 2°C (35°F) and a maximum of 18°C (65°F), making it a season of mild climates. With an average precipitation of 70 mm (2.8 in) spread over 7 days, don't forget your umbrella! Additionally, the air carries a 76% humidity, adding a slight chill to the atmosphere.

January Temperature in Oyama

In January, in Oyama, the average temperature is 10°C (49°F). Maximum temperatures can reach 18°C (65°F), while minimums can dip as low as 2°C (35°F). Be prepared for a mild climate with varying temperatures, making it a great time for outdoor activities and exploring the local attractions.

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

The chart illustrates January temperature patterns in Oyama, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Oyama, January typically has an average temperature of 10°C (49°F), with highs reaching up to 18°C (65°F) and lows dropping to around 2°C (35°F).

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

January Precipitation in Oyama

In Oyama in January, the precipitation amount is 70 mm (2.8 in) over a span of 7 days.

January Precipitation Trends in Oyama

The chart displays monthly precipitation patterns in Oyama, 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 Oyama, January typically receives around 70 mm (2.8 inches) of precipitation spread over approximately 7 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 Oyama

In Oyama in January, humidity is 76%. With an average temperature of 10°C (49°F), this humidity feels like a brisk chill that clings to your skin, making outdoor adventures feel damp and slightly uncomfortable for traveling.

January Average Humidity in Oyama

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

In Oyama 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 Oyama for better planning.

Maximum UV Index Levels in Oyama for January

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

Data source: Oyama 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 Oyama Compares to Other Months

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

This table compares monthly weather conditions in Oyama, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (49°F)	70 mm (2.8 inches)	76%	moderate
February Weather	10°C (50°F)	93 mm (3.7 inches)	74%	high
March Weather	13°C (55°F)	189 mm (7.4 inches)	70%	very high
April Weather	16°C (60°F)	164 mm (6.4 inches)	74%	very high
May Weather	19°C (67°F)	213 mm (8.4 inches)	81%	extreme
June Weather	22°C (72°F)	302 mm (11.9 inches)	88%	extreme
July Weather	25°C (78°F)	363 mm (14.3 inches)	93%	extreme
August Weather	27°C (81°F)	163 mm (6.4 inches)	90%	extreme
September Weather	25°C (78°F)	255 mm (10.0 inches)	86%	very high
October Weather	22°C (71°F)	328 mm (12.9 inches)	83%	high
November Weather	17°C (63°F)	137 mm (5.4 inches)	80%	moderate
December Weather	12°C (55°F)	99 mm (3.9 inches)	78%	moderate