September Weather in Oga, Japan

Last updated: August 23, 2025

In September, the average temperature in Oga, Japan hovers around 22°C (72°F), offering a pleasant climate for outdoor activities. Expect comfortable evenings with minimums of 17°C (63°F), while daytime highs can reach up to 30°C (87°F). Keep in mind that precipitation can be significant, with 165 mm (6.5 in) expected over approximately 15 days. Additionally, the air is quite humid, with an average humidity level of 84%, best suited for those who enjoy a tropical feel!

September Temperature in Oga

In September in Oga, the average temperature is 22°C (72°F). Maximums can reach 30°C (87°F), while minimums can drop as low as 17°C (63°F). It's a great time for travelers seeking pleasant weather and outdoor activities.

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

The chart illustrates September temperature patterns in Oga, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Oga, September typically has an average temperature of 22°C (72°F), with highs reaching up to 30°C (87°F) and lows dropping to around 17°C (63°F).

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

September Precipitation in Oga

In Oga in September, the total precipitation amount is 165 mm (6.5 in) over a span of 15 days.

September Precipitation Trends in Oga

The chart displays monthly precipitation patterns in Oga, 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 Oga, September typically receives around 165 mm (6.5 inches) of precipitation spread over approximately 15 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Oga

In Oga in September humidity is 84%. With an average temperature of 22°C (72°F), this humidity feels like a warm embrace, making travel feel slightly stifling but also lending a vibrant energy to the atmosphere, which can be both invigorating and tiring as you explore.

September Average Humidity in Oga

This chart illustrates the average monthly humidity levels in Oga, 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 Oga is approximately 84%, 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 Oga

In Oga in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Oga.

Maximum UV Index Levels in Oga for September

The chart shows the monthly maximum UV Index (UVI) for Oga 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 Oga typically reaches 9, which falls under the very high exposure category.

Data source: Oga 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 Oga Compares to Other Months

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

This table compares monthly weather conditions in Oga, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	3°C (37°F)	148 mm (5.8 inches)	79%	moderate
February Weather	3°C (37°F)	159 mm (6.3 inches)	78%	moderate
March Weather	6°C (43°F)	116 mm (4.6 inches)	76%	high
April Weather	9°C (49°F)	129 mm (5.1 inches)	78%	very high
May Weather	14°C (58°F)	133 mm (5.2 inches)	86%	very high
June Weather	18°C (65°F)	146 mm (5.8 inches)	90%	very high
July Weather	23°C (74°F)	160 mm (6.3 inches)	93%	very high
August Weather	25°C (78°F)	199 mm (7.8 inches)	92%	extreme
September Weather	22°C (72°F)	165 mm (6.5 inches)	84%	very high
October Weather	17°C (63°F)	218 mm (8.6 inches)	80%	high
November Weather	11°C (53°F)	194 mm (7.6 inches)	76%	moderate
December Weather	6°C (42°F)	256 mm (10.1 inches)	78%	low