January Weather in Sayama, Japan

Last updated: August 23, 2025

In Sayama, Japan, the average temperature in January hovers around 4°C (40°F), with a minimum dipping as low as -9°C (16°F) and a pleasant maximum of 19°C (66°F). Expect an average precipitation of 47 mm (1.8 in) spread over 5 days, accompanied by a cozy average humidity of 76%.

January Temperature in Sayama

In January in Sayama, the average temperature is 4°C (40°F), with maximums reaching 19°C (66°F) and minimums dropping as low as -9°C (16°F). It's advisable to pack layers and be prepared for chilly conditions, as well as the potential for warmer days.

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

The chart illustrates January temperature patterns in Sayama, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sayama, January typically has an average temperature of 4°C (40°F), with highs reaching up to 19°C (66°F) and lows dropping to around -9°C (16°F).

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

January Precipitation in Sayama

In Sayama in January, the total precipitation amount is 47 mm (1.8 in) over the course of 5 days.

January Precipitation Trends in Sayama

The chart displays monthly precipitation patterns in 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 Sayama, January typically receives around 47 mm (1.8 inches) of precipitation spread over approximately 5 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 Sayama

In Sayama in January humidity is 76%. With an average temperature of 4°C (40°F), this humidity feels like a chilly embrace, making travel feel damp and slightly clammy, as the cool air clings to your skin, requiring extra layers to stay comfortable while experiencing the sights.

January Average Humidity in Sayama

This chart illustrates the average monthly humidity levels in 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 Sayama 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 Sayama

In Sayama in January, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Sayama, you can check the information here.

Maximum UV Index Levels in Sayama for January

The chart shows the monthly maximum UV Index (UVI) for 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 Sayama typically reaches 3, which falls under the moderate exposure category.

Data source: 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 Sayama Compares to Other Months

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

This table compares monthly weather conditions in Sayama, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (40°F)	47 mm (1.8 inches)	76%	moderate
February Weather	6°C (42°F)	50 mm (2.0 inches)	74%	moderate
March Weather	10°C (50°F)	144 mm (5.7 inches)	70%	very high
April Weather	14°C (57°F)	126 mm (5.0 inches)	74%	very high
May Weather	19°C (67°F)	117 mm (4.6 inches)	81%	extreme
June Weather	22°C (72°F)	168 mm (6.6 inches)	88%	extreme
July Weather	26°C (79°F)	252 mm (9.9 inches)	93%	extreme
August Weather	28°C (82°F)	133 mm (5.3 inches)	90%	extreme
September Weather	23°C (74°F)	201 mm (7.9 inches)	86%	very high
October Weather	18°C (64°F)	291 mm (11.4 inches)	83%	high
November Weather	12°C (55°F)	69 mm (2.7 inches)	80%	moderate
December Weather	7°C (44°F)	55 mm (2.2 inches)	78%	moderate