January Weather in Aya, Japan

Last updated: August 23, 2025

In January, the average temperature in Aya, Japan hovers around 6°C (44°F), with fluctuations ranging from a chilly -5°C (24°F) to a mild 21°C (70°F). Expect about 55 mm (2.2 in) of precipitation spread over 5 days, coupled with an average humidity of 72%. Prepare for a mix of cool days and dampness during your visit!

January Temperature in Aya

In January in Aya, the average temperature is 6°C (44°F), with maximums reaching up to 21°C (70°F) and minimums dropping as low as -5°C (24°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for both mild and chilly conditions.

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

The chart illustrates January temperature patterns in Aya, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Aya, January typically has an average temperature of 6°C (44°F), with highs reaching up to 21°C (70°F) and lows dropping to around -5°C (24°F).

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

January Precipitation in Aya

In Aya in January, the precipitation amount is 55 mm (2.2 in) distributed over a period of 5 days.

January Precipitation Trends in Aya

The chart displays monthly precipitation patterns in Aya, 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 Aya, January typically receives around 55 mm (2.2 inches) of precipitation spread over approximately 5 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 Aya

In Aya in January, humidity is 72%. With an average temperature of 6°C (44°F), this humidity feels like a chilly, damp embrace that can make traveling uncomfortable if you're not dressed for the weather.

January Average Humidity in Aya

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

In Aya 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 Aya.

Maximum UV Index Levels in Aya for January

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

Data source: Aya 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 Aya Compares to Other Months

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

This table compares monthly weather conditions in Aya, 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 (44°F)	55 mm (2.2 inches)	72%	moderate
February Weather	8°C (46°F)	101 mm (4.0 inches)	68%	high
March Weather	12°C (53°F)	176 mm (6.9 inches)	72%	very high
April Weather	15°C (60°F)	141 mm (5.6 inches)	79%	very high
May Weather	19°C (67°F)	225 mm (8.9 inches)	83%	extreme
June Weather	22°C (72°F)	321 mm (12.6 inches)	86%	extreme
July Weather	26°C (79°F)	388 mm (15.3 inches)	90%	extreme
August Weather	27°C (81°F)	247 mm (9.7 inches)	85%	extreme
September Weather	24°C (76°F)	319 mm (12.5 inches)	80%	extreme
October Weather	19°C (67°F)	202 mm (8.0 inches)	78%	very high
November Weather	14°C (57°F)	87 mm (3.4 inches)	76%	high
December Weather	8°C (47°F)	71 mm (2.8 inches)	74%	moderate