December Weather in Isahaya, Japan

Last updated: August 23, 2025

In Isahaya, Japan, the average temperature in December hovers around 10°C (51°F). Expect a minimum drop to 2°C (36°F) and a maximum rise to 22°C (71°F). Precipitation averages 92 mm (3.6 in) over 8 days, contributing to an average humidity of 72%. Embrace the variety of weather as you explore this captivating destination!

December Temperature in Isahaya

In December in Isahaya, the average temperature is 10°C (51°F). Maximums can reach 22°C (71°F), while minimums can drop as low as 2°C (36°F). This variation makes it a great time for travelers to enjoy mild weather while exploring the sights.

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

The chart illustrates December 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, December typically has an average temperature of 10°C (51°F), with highs reaching up to 22°C (71°F) and lows dropping to around 2°C (36°F).

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

December Precipitation in Isahaya

In Isahaya in December, the precipitation amount is 92 mm (3.6 in), occurring over the course of 8 days.

December Precipitation Trends in Isahaya

The chart displays monthly precipitation patterns in Isahaya, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Isahaya, December typically receives around 92 mm (3.6 inches) of precipitation spread over approximately 8 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

December Humidity in Isahaya

In Isahaya in December, humidity is 72%. With an average temperature of 10°C (51°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities less comfortable and requiring extra layers to stay warm while exploring.

December Average Humidity in Isahaya

This chart illustrates the average monthly humidity levels in Isahaya, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Isahaya is approximately 72%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Isahaya

In Isahaya in December, 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 December

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

Data source: Isahaya December 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 December 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 December’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 December’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