September Weather in Hanyu, Japan

Last updated: August 23, 2025

In Hanyu, Japan, the average temperature in September hovers around 23°C (74°F), with a range that can dip to a minimum of 13°C (55°F) and peak at a sweltering 35°C (95°F). Expect a substantial amount of rainfall, with 213 mm (8.4 in) spread across 21 days of the month, leading to an average humidity level of 89%.

September Temperature in Hanyu

In September in Hanyu, the average temperature is 23°C (74°F). Maximum can reach 35°C (95°F) and minimum can be as low as 13°C (55°F). This pleasant climate makes Hanyu an ideal destination for travelers looking to enjoy outdoor activities and explore the local attractions.

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

The chart illustrates September temperature patterns in Hanyu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hanyu, September typically has an average temperature of 23°C (74°F), with highs reaching up to 35°C (95°F) and lows dropping to around 13°C (55°F).

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

September Precipitation in Hanyu

In Hanyu in September, the precipitation amount is 213 mm (8.4 in) during 21 days, highlighting the region's wet conditions for that period.

September Precipitation Trends in Hanyu

The chart displays monthly precipitation patterns in Hanyu, 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 Hanyu, September typically receives around 213 mm (8.4 inches) of precipitation spread over approximately 21 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 Hanyu

In Hanyu in September humidity is 89%. With an average temperature of 23°C (74°F), this humidity feels like a warm, heavy blanket enveloping you, making traveling feel stifling and exhausting as you navigate the thick air.

September Average Humidity in Hanyu

This chart illustrates the average monthly humidity levels in Hanyu, 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 Hanyu is approximately 89%, 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 Hanyu

In Hanyu 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 Hanyu.

Maximum UV Index Levels in Hanyu for September

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

Data source: Hanyu 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 Hanyu Compares to Other Months

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

This table compares monthly weather conditions in Hanyu, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (39°F)	40 mm (1.6 inches)	88%	moderate
February Weather	5°C (41°F)	42 mm (1.7 inches)	86%	moderate
March Weather	9°C (49°F)	129 mm (5.1 inches)	81%	high
April Weather	14°C (57°F)	127 mm (5.0 inches)	78%	very high
May Weather	19°C (66°F)	137 mm (5.4 inches)	81%	very high
June Weather	22°C (72°F)	175 mm (6.9 inches)	88%	extreme
July Weather	25°C (78°F)	274 mm (10.8 inches)	92%	extreme
August Weather	27°C (82°F)	163 mm (6.4 inches)	92%	very high
September Weather	23°C (74°F)	213 mm (8.4 inches)	89%	very high
October Weather	18°C (64°F)	267 mm (10.5 inches)	87%	high
November Weather	12°C (53°F)	57 mm (2.3 inches)	85%	moderate
December Weather	6°C (43°F)	45 mm (1.8 inches)	86%	moderate