September Weather in Ono, Japan

Last updated: August 23, 2025

In September, the average temperature in Ono, Japan hovers around 25°C (78°F). Expect a range where the minimum dips to 14°C (58°F) and the maximum soars to 34°C (94°F). With about 205 mm (8.1 in) of precipitation over 15 days, you can anticipate a humid atmosphere, as the average humidity reaches a lush 87%.

September Temperature in Ono

In September in Ono, the average temperature is 25°C (78°F). Maximums can reach 34°C (94°F) and minimums can be as low as 14°C (58°F). This makes it an ideal time for travelers to enjoy outdoor activities while still being prepared for some cooler evenings.

September Weather in Ono: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Ono, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ono, September typically has an average temperature of 25°C (78°F), with highs reaching up to 34°C (94°F) and lows dropping to around 14°C (58°F).

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

September Precipitation in Ono

In Ono in September, the total precipitation amount is 205 mm (8.1 in) spread over a duration of 15 days.

September Precipitation Trends in Ono

The chart displays monthly precipitation patterns in Ono, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Ono, September typically receives around 205 mm (8.1 inches) of precipitation spread over approximately 15 days.

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

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Millimeters (mm) Inches (in)

September Humidity in Ono

In Ono in September, humidity is 87%. With an average temperature of 25°C (78°F), this humidity feels like a warm, heavy blanket enveloping you, making outdoor activities particularly strenuous and requiring frequent breaks for hydration and shade.

September Average Humidity in Ono

This chart illustrates the average monthly humidity levels in Ono, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Ono is approximately 87%, offering insight into how humid the weather typically is during this month.

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

September UV Index in Ono

In Ono in September, 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 Ono.

Maximum UV Index Levels in Ono for September

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

Data source: Ono September 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 September Weather in Ono Compares to Other Months

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

This table compares monthly weather conditions in Ono, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	7°C (44°F)	41 mm (1.6 inches)	82%	moderate
February Weather	7°C (44°F)	51 mm (2.0 inches)	79%	high
March Weather	10°C (51°F)	99 mm (3.9 inches)	73%	very high
April Weather	15°C (59°F)	122 mm (4.8 inches)	74%	extreme
May Weather	20°C (68°F)	138 mm (5.4 inches)	84%	extreme
June Weather	23°C (74°F)	140 mm (5.5 inches)	86%	extreme
July Weather	27°C (81°F)	302 mm (11.9 inches)	92%	extreme
August Weather	29°C (84°F)	187 mm (7.3 inches)	92%	extreme
September Weather	25°C (78°F)	205 mm (8.1 inches)	87%	very high
October Weather	20°C (68°F)	225 mm (8.9 inches)	85%	high
November Weather	14°C (58°F)	45 mm (1.8 inches)	84%	moderate
December Weather	9°C (49°F)	55 mm (2.2 inches)	82%	moderate