January Weather in Isahaya, Japan

Last updated: August 23, 2025

In January, the average temperature in Isahaya, Japan hovers around 8°C (47°F), providing a cool atmosphere for exploration. Expect the temperature to drop as low as 0°C (32°F) and rise up to a pleasant 18°C (65°F). During this period, an average of 61 mm (2.4 in) of precipitation falls over 8 days, accompanied by a relative humidity of 73%. Prepare accordingly to enjoy everything this destination has to offer!

January Temperature in Isahaya

In January in Isahaya, the average temperature is 8°C (47°F). Maximums can reach 18°C (65°F) and minimums can be as low as 0°C (32°F). This makes it a great time to explore the outdoors while layering your clothing for comfort.

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

The chart illustrates January temperature patterns in Isahaya, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Isahaya, January typically has an average temperature of 8°C (47°F), with highs reaching up to 18°C (65°F) and lows dropping to around 0°C (32°F).

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

January Precipitation in Isahaya

In Isahaya in January, the precipitation amount is 61 mm (2.4 in) distributed over 8 days.

January Precipitation Trends in Isahaya

The chart displays monthly precipitation patterns in Isahaya, 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 Isahaya, January typically receives around 61 mm (2.4 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 Isahaya

In Isahaya in January humidity is 73%. With an average temperature of 8°C (47°F), this humidity feels like a chilly dampness that can make outdoor activities less enjoyable, wrapping you in a thick, misty embrace that weighs heavily on your clothes and skin, making travel seem a bit more cumbersome and less invigorating.

January Average Humidity in Isahaya

This chart illustrates the average monthly humidity levels in Isahaya, 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 Isahaya is approximately 73%, 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 Isahaya

In Isahaya 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 Isahaya for better planning.

Maximum UV Index Levels in Isahaya for January

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

Data source: Isahaya 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 Isahaya Compares to Other Months

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

This table compares monthly weather conditions in Isahaya, 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 (47°F)	61 mm (2.4 inches)	73%	moderate
February Weather	9°C (48°F)	106 mm (4.2 inches)	69%	high
March Weather	12°C (54°F)	157 mm (6.2 inches)	71%	very high
April Weather	15°C (60°F)	143 mm (5.6 inches)	79%	extreme
May Weather	19°C (67°F)	229 mm (9.0 inches)	87%	extreme
June Weather	22°C (73°F)	272 mm (10.7 inches)	91%	extreme
July Weather	26°C (79°F)	442 mm (17.4 inches)	97%	extreme
August Weather	28°C (82°F)	326 mm (12.8 inches)	94%	extreme
September Weather	25°C (77°F)	225 mm (8.9 inches)	84%	extreme
October Weather	20°C (69°F)	117 mm (4.6 inches)	79%	very high
November Weather	15°C (60°F)	81 mm (3.2 inches)	75%	high
December Weather	10°C (51°F)	92 mm (3.6 inches)	72%	moderate