September Weather in Ashiya, Japan

Last updated: August 23, 2025

In September, the average temperature in Ashiya, Japan hovers around 25°C (77°F), offering a pleasant climate. However, be prepared for fluctuations, as temperatures can dip to a chilly 15°C (59°F) or soar to a sweltering 35°C (96°F). Expect some rainfall, with 197 mm (7.8 in) spread over 14 days. Additionally, the average humidity level is a high 87%, creating a uniquely tropical atmosphere.

September Temperature in Ashiya

In September in Ashiya, the average temperature is 25°C (77°F). Maximums can reach 35°C (96°F) and minimums can be as low as 15°C (59°F). This makes Ashiya an ideal destination for travelers seeking warm weather and outdoor adventures.

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

The chart illustrates September temperature patterns in Ashiya, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ashiya, September typically has an average temperature of 25°C (77°F), with highs reaching up to 35°C (96°F) and lows dropping to around 15°C (59°F).

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

September Precipitation in Ashiya

In Ashiya in September, the total precipitation amount is 197 mm (7.8 in) spread over a duration of 14 days.

September Precipitation Trends in Ashiya

The chart displays monthly precipitation patterns in Ashiya, 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 Ashiya, September typically receives around 197 mm (7.8 inches) of precipitation spread over approximately 14 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 Ashiya

In Ashiya in September, humidity is 87%. With an average temperature of 25°C (77°F), this humidity feels like a thick, warm blanket enveloping you, making travel a challenge as sweat clings to your skin and the air feels heavy and stifling.

September Average Humidity in Ashiya

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

In Ashiya 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 Ashiya.

Maximum UV Index Levels in Ashiya for September

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

Data source: Ashiya 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 Ashiya Compares to Other Months

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

This table compares monthly weather conditions in Ashiya, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	6°C (43°F)	45 mm (1.8 inches)	82%	moderate
February Weather	6°C (44°F)	57 mm (2.3 inches)	79%	high
March Weather	10°C (51°F)	109 mm (4.3 inches)	74%	very high
April Weather	15°C (59°F)	137 mm (5.4 inches)	76%	extreme
May Weather	20°C (68°F)	154 mm (6.0 inches)	83%	extreme
June Weather	23°C (74°F)	153 mm (6.0 inches)	87%	extreme
July Weather	27°C (81°F)	317 mm (12.5 inches)	93%	extreme
August Weather	29°C (84°F)	210 mm (8.3 inches)	91%	extreme
September Weather	25°C (77°F)	197 mm (7.8 inches)	87%	very high
October Weather	20°C (68°F)	235 mm (9.2 inches)	85%	high
November Weather	14°C (57°F)	47 mm (1.9 inches)	83%	moderate
December Weather	8°C (48°F)	60 mm (2.3 inches)	83%	moderate