January Weather in Osaki, Japan

Last updated: August 23, 2025

In January, the average temperature in Osaki, Japan hovers around 8°C (46°F), with a minimum plunging to -4°C (26°F) and a maximum peaking at 22°C (71°F). Expect about 55 mm (2.2 in) of precipitation spread over 6 days, and enjoy a rather high average humidity of 72%. Prepare accordingly for a mix of cool, wet, and humid days!

January Temperature in Osaki

In January in Osaki, the average temperature is 8°C (46°F). The maximum can reach 22°C (71°F), while the minimum can drop to as low as -4°C (26°F). It's a great time for travelers to enjoy the mild weather and prepare for the temperature fluctuations.

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

The chart illustrates January temperature patterns in Osaki, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Osaki, January typically has an average temperature of 8°C (46°F), with highs reaching up to 22°C (71°F) and lows dropping to around -4°C (26°F).

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

January Precipitation in Osaki

In Osaki in January, the total precipitation amount is 55 mm (2.2 in) spread over 6 days.

January Precipitation Trends in Osaki

The chart displays monthly precipitation patterns in Osaki, 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 Osaki, January typically receives around 55 mm (2.2 inches) of precipitation spread over approximately 6 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 Osaki

In Osaki in January humidity is 72%. With an average temperature of 8°C (46°F), this humidity feels like a chilly blanket wrapping around you, making outdoor activities somewhat uncomfortable and requiring travelers to dress in layers to stay warm and dry.

January Average Humidity in Osaki

This chart illustrates the average monthly humidity levels in Osaki, 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 Osaki is approximately 72%, 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 Osaki

In Osaki in January, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Osaki.

Maximum UV Index Levels in Osaki for January

The chart shows the monthly maximum UV Index (UVI) for Osaki 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 Osaki typically reaches 5, which falls under the moderate exposure category.

Data source: Osaki 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 Osaki Compares to Other Months

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

This table compares monthly weather conditions in Osaki, 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 (46°F)	55 mm (2.2 inches)	72%	moderate
February Weather	9°C (48°F)	105 mm (4.2 inches)	68%	high
March Weather	13°C (55°F)	178 mm (7.0 inches)	72%	very high
April Weather	16°C (62°F)	142 mm (5.6 inches)	79%	very high
May Weather	20°C (69°F)	251 mm (9.9 inches)	83%	extreme
June Weather	23°C (74°F)	408 mm (16.0 inches)	86%	extreme
July Weather	27°C (80°F)	378 mm (14.9 inches)	90%	extreme
August Weather	28°C (82°F)	229 mm (9.0 inches)	85%	extreme
September Weather	25°C (78°F)	289 mm (11.4 inches)	80%	extreme
October Weather	21°C (70°F)	170 mm (6.7 inches)	78%	very high
November Weather	15°C (59°F)	95 mm (3.8 inches)	76%	high
December Weather	10°C (50°F)	79 mm (3.1 inches)	74%	moderate