April Weather in Katsuyama, Japan

Last updated: August 23, 2025

In Katsuyama, Japan, the average temperature in April hovers around 9°C (49°F). Be prepared for a range of temperatures, with minimums dipping to -3°C (26°F) and maximums reaching a pleasant 24°C (76°F). Expect precipitation of about 216 mm (8.5 in) spread over 15 days, and humidity levels averaging around 76%.

April Temperature in Katsuyama

In April, in Katsuyama, the average temperature is 9°C (49°F). The maximum can reach 24°C (76°F), while the minimum can drop as low as -3°C (26°F). Be prepared for both mild days and chilly nights when traveling during this month.

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

The chart illustrates April temperature patterns in Katsuyama, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Katsuyama, April typically has an average temperature of 9°C (49°F), with highs reaching up to 24°C (76°F) and lows dropping to around -3°C (26°F).

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

April Precipitation in Katsuyama

In Katsuyama in April, the total amount of precipitation is 216 mm (8.5 in) spread over 15 days.

April Precipitation Trends in Katsuyama

The chart displays monthly precipitation patterns in Katsuyama, 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 Katsuyama, April typically receives around 216 mm (8.5 inches) of precipitation spread over approximately 15 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 Katsuyama

In Katsuyama in April, humidity is 76%. With an average temperature of 9°C (49°F), this humidity feels like a chilly embrace, making outdoor adventures a bit uncomfortable as the dampness seeps into your clothes and lingers in the air, often leading to a sense of coolness that can be refreshing but also dampens the joy of exploration.

April Average Humidity in Katsuyama

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

In Katsuyama 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 Katsuyama.

Maximum UV Index Levels in Katsuyama for April

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

Data source: Katsuyama 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 Katsuyama Compares to Other Months

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

This table compares monthly weather conditions in Katsuyama, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-1°C (30°F)	165 mm (6.5 inches)	82%	moderate
February Weather	-1°C (31°F)	167 mm (6.6 inches)	79%	high
March Weather	4°C (40°F)	191 mm (7.5 inches)	74%	very high
April Weather	9°C (49°F)	216 mm (8.5 inches)	76%	very high
May Weather	15°C (59°F)	201 mm (7.9 inches)	83%	extreme
June Weather	18°C (65°F)	226 mm (8.9 inches)	87%	extreme
July Weather	23°C (73°F)	436 mm (17.2 inches)	93%	extreme
August Weather	24°C (76°F)	304 mm (12.0 inches)	91%	extreme
September Weather	20°C (68°F)	244 mm (9.6 inches)	87%	very high
October Weather	14°C (58°F)	230 mm (9.1 inches)	85%	high
November Weather	8°C (46°F)	127 mm (5.0 inches)	83%	moderate
December Weather	2°C (36°F)	195 mm (7.7 inches)	83%	moderate