April Weather in Kosai, Japan

Last updated: August 23, 2025

In Kosai, Japan, the average temperature in April hovers around 16°C (60°F), with a minimum dipping down to 3°C (38°F) and a maximum reaching up to 28°C (82°F). Expect some rain as well, with precipitation averaging 160 mm (6.3 in) over approximately 10 days. The climate is generally quite humid, with an average humidity of 76%, making it a unique weather experience for visitors and locals alike!

April Temperature in Kosai

In April in Kosai, the average temperature is 16°C (60°F). The maximum can reach 28°C (82°F), and the minimum can be as low as 3°C (38°F). This makes it an ideal time for travelers to enjoy mild weather while exploring the sights.

April Weather in Kosai: Daily Temperature Highs, Lows, and Averages

The chart illustrates April temperature patterns in Kosai, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kosai, April typically has an average temperature of 16°C (60°F), with highs reaching up to 28°C (82°F) and lows dropping to around 3°C (38°F).

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

April Precipitation in Kosai

In Kosai in April, the precipitation amount is 160 mm (6.3 in) over a period of 10 days.

April Precipitation Trends in Kosai

The chart displays monthly precipitation patterns in Kosai, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In Kosai, April typically receives around 160 mm (6.3 inches) of precipitation spread over approximately 10 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

April Humidity in Kosai

In Kosai in April humidity is 76%. With an average temperature of 16°C (60°F), this humidity feels like a warm embrace, making it somewhat uncomfortable for traveling, as the air can feel heavy and oppressive, potentially leading to fatigue and a constant need for hydration.

April Average Humidity in Kosai

This chart illustrates the average monthly humidity levels in Kosai, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in Kosai is approximately 76%, offering insight into how humid the weather typically is during this month.

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

April UV Index in Kosai

In Kosai in April, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Kosai.

Maximum UV Index Levels in Kosai for April

The chart shows the monthly maximum UV Index (UVI) for Kosai in April, 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 April, the maximum UV index in Kosai typically reaches 10, which falls under the very high exposure category.

Data source: Kosai April 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 April Weather in Kosai Compares to Other Months

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

This table compares monthly weather conditions in Kosai, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	6°C (44°F)	49 mm (1.9 inches)	82%	moderate
February Weather	7°C (45°F)	69 mm (2.7 inches)	79%	moderate
March Weather	12°C (53°F)	154 mm (6.1 inches)	74%	very high
April Weather	16°C (60°F)	160 mm (6.3 inches)	76%	very high
May Weather	20°C (69°F)	187 mm (7.4 inches)	83%	extreme
June Weather	23°C (74°F)	240 mm (9.4 inches)	87%	extreme
July Weather	27°C (81°F)	385 mm (15.2 inches)	93%	extreme
August Weather	29°C (85°F)	189 mm (7.4 inches)	91%	extreme
September Weather	25°C (78°F)	217 mm (8.5 inches)	87%	very high
October Weather	20°C (68°F)	284 mm (11.2 inches)	85%	high
November Weather	14°C (58°F)	75 mm (2.9 inches)	83%	moderate
December Weather	9°C (48°F)	65 mm (2.6 inches)	83%	moderate