April Weather in Onna, Japan

Last updated: August 23, 2025

In Onna, Japan, the average temperature in April is a mild 21°C (70°F), with lows of 15°C (60°F) and highs reaching 26°C (79°F). Expect 146 mm (5.7 in) of precipitation spread over 12 days, contributing to an average humidity of 82%.

April Temperature in Onna

In April in Onna, the average temperature is 21°C (70°F). Maximums can reach 26°C (79°F) and minimums can be as low as 15°C (60°F). This mild climate makes it an ideal time for travelers to explore the sights and enjoy outdoor activities.

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

The chart illustrates April temperature patterns in Onna, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Onna, April typically has an average temperature of 21°C (70°F), with highs reaching up to 26°C (79°F) and lows dropping to around 15°C (60°F).

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

April Precipitation in Onna

In Onna in April, the total precipitation amount is 146 mm (5.7 in) spread over a duration of 12 days.

April Precipitation Trends in Onna

The chart displays monthly precipitation patterns in Onna, 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 Onna, April typically receives around 146 mm (5.7 inches) of precipitation spread over approximately 12 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 Onna

In Onna in April, humidity is 82%. With an average temperature of 21°C (70°F), this humidity feels like a warm, sticky embrace that can quickly lead to discomfort for travelers, making outdoor activities less enjoyable and requiring frequent breaks for hydration.

April Average Humidity in Onna

This chart illustrates the average monthly humidity levels in Onna, 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 Onna is approximately 82%, 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 Onna

In Onna in April, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in Onna.

Maximum UV Index Levels in Onna for April

The chart shows the monthly maximum UV Index (UVI) for Onna 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 Onna typically reaches 12, which falls under the extreme exposure category.

Data source: Onna 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 Onna Compares to Other Months

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

This table compares monthly weather conditions in Onna, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	18°C (65°F)	99 mm (3.9 inches)	71%	high
February Weather	18°C (65°F)	98 mm (3.9 inches)	71%	very high
March Weather	20°C (68°F)	109 mm (4.3 inches)	76%	extreme
April Weather	21°C (70°F)	146 mm (5.7 inches)	82%	extreme
May Weather	24°C (75°F)	213 mm (8.4 inches)	84%	extreme
June Weather	26°C (80°F)	328 mm (12.9 inches)	86%	extreme
July Weather	28°C (83°F)	180 mm (7.1 inches)	86%	extreme
August Weather	28°C (83°F)	187 mm (7.4 inches)	82%	extreme
September Weather	28°C (82°F)	237 mm (9.3 inches)	82%	extreme
October Weather	26°C (78°F)	149 mm (5.8 inches)	80%	very high
November Weather	23°C (74°F)	106 mm (4.2 inches)	79%	very high
December Weather	20°C (68°F)	162 mm (6.4 inches)	75%	high