September Weather in Aki, Japan

Last updated: August 23, 2025

In September, the average temperature in Aki, Japan hovers around 24°C (76°F), with a minimum of 16°C (60°F) and a maximum reaching 31°C (88°F). Expect significant rainfall, as 315 mm (12.4 in) of precipitation falls over 19 days. The air is notably humid, with an average humidity level of 85%, creating a warm and lush atmosphere throughout the month.

September Temperature in Aki

In September, in Aki, the average temperature is 24°C (76°F). Maximums can reach 31°C (88°F), and minimums can be as low as 16°C (60°F). This pleasant climate makes Aki an ideal destination for travelers seeking comfortable weather for exploration and outdoor activities.

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

The chart illustrates September temperature patterns in Aki, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Aki, September typically has an average temperature of 24°C (76°F), with highs reaching up to 31°C (88°F) and lows dropping to around 16°C (60°F).

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

September Precipitation in Aki

In Aki in September, the precipitation amount is 315 mm (12.4 in) over the course of 19 days.

September Precipitation Trends in Aki

The chart displays monthly precipitation patterns in Aki, 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 Aki, September typically receives around 315 mm (12.4 inches) of precipitation spread over approximately 19 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 Aki

In Aki in September humidity is 85%. With an average temperature of 24°C (76°F), this humidity feels like walking through a warm, thick blanket that envelops you, making every step slightly more laborious and prompting a constant desire for refreshing coolness while exploring.

September Average Humidity in Aki

This chart illustrates the average monthly humidity levels in Aki, 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 Aki is approximately 85%, 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 Aki

In Aki 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 Aki.

Maximum UV Index Levels in Aki for September

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

Data source: Aki 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 Aki Compares to Other Months

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

This table compares monthly weather conditions in Aki, 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 (45°F)	71 mm (2.8 inches)	74%	moderate
February Weather	7°C (45°F)	98 mm (3.8 inches)	70%	high
March Weather	11°C (52°F)	169 mm (6.7 inches)	70%	very high
April Weather	15°C (59°F)	197 mm (7.8 inches)	76%	extreme
May Weather	19°C (66°F)	242 mm (9.5 inches)	82%	extreme
June Weather	22°C (71°F)	318 mm (12.5 inches)	86%	extreme
July Weather	25°C (77°F)	545 mm (21.5 inches)	91%	extreme
August Weather	27°C (80°F)	349 mm (13.8 inches)	88%	extreme
September Weather	24°C (76°F)	315 mm (12.4 inches)	85%	very high
October Weather	20°C (67°F)	296 mm (11.6 inches)	82%	very high
November Weather	14°C (58°F)	72 mm (2.8 inches)	79%	high
December Weather	9°C (49°F)	74 mm (2.9 inches)	77%	moderate