January Weather in Osaka-sayama, Japan

Last updated: August 23, 2025

In Osaka-sayama, Japan, the average temperature in January hovers around 6°C (42°F). Expect a chilly minimum of -4°C (26°F) and a mild maximum of 18°C (65°F). With an average precipitation of 53 mm (2.1 in) over about 8 days, you might want to pack an umbrella! Don't forget that the air carries a notable 82% humidity, adding to the overall experience of the season.

January Temperature in Osaka-sayama

In January in Osaka-sayama, the average temperature is 6°C (42°F), with maximums reaching up to 18°C (65°F) and minimums dropping as low as -4°C (26°F). This varied climate makes it essential to pack layers for your travels.

January Weather in Osaka-sayama: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Osaka-sayama, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Osaka-sayama, January typically has an average temperature of 6°C (42°F), with highs reaching up to 18°C (65°F) and lows dropping to around -4°C (26°F).

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

January Precipitation in Osaka-sayama

In Osaka-sayama in January, the total precipitation amount is 53 mm (2.1 in) over the course of 8 days.

January Precipitation Trends in Osaka-sayama

The chart displays monthly precipitation patterns in Osaka-sayama, 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 Osaka-sayama, January typically receives around 53 mm (2.1 inches) of precipitation spread over approximately 8 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 Osaka-sayama

In Osaka-sayama in January, humidity is 82%. With an average temperature of 6°C (42°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities uncomfortable and prompting travelers to seek cozy indoor spaces instead.

January Average Humidity in Osaka-sayama

This chart illustrates the average monthly humidity levels in Osaka-sayama, 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 Osaka-sayama is approximately 82%, 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 Osaka-sayama

In Osaka-sayama 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 Osaka-sayama for better planning.

Maximum UV Index Levels in Osaka-sayama for January

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

Data source: Osaka-sayama 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 Osaka-sayama Compares to Other Months

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

This table compares monthly weather conditions in Osaka-sayama, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	6°C (42°F)	53 mm (2.1 inches)	82%	moderate
February Weather	6°C (43°F)	65 mm (2.6 inches)	79%	high
March Weather	10°C (51°F)	110 mm (4.3 inches)	74%	very high
April Weather	15°C (59°F)	122 mm (4.8 inches)	76%	extreme
May Weather	20°C (68°F)	146 mm (5.7 inches)	83%	extreme
June Weather	23°C (74°F)	166 mm (6.5 inches)	87%	extreme
July Weather	27°C (82°F)	270 mm (10.6 inches)	93%	extreme
August Weather	29°C (85°F)	160 mm (6.3 inches)	91%	extreme
September Weather	25°C (77°F)	164 mm (6.5 inches)	87%	very high
October Weather	19°C (67°F)	238 mm (9.4 inches)	85%	high
November Weather	13°C (56°F)	48 mm (1.9 inches)	83%	high
December Weather	8°C (47°F)	62 mm (2.5 inches)	83%	moderate