September Weather in Yashio, Japan

Last updated: August 23, 2025

In September, the average temperature in Yashio, Japan hovers around 24°C (75°F), with a minimum dipping to 13°C (56°F) and a maximum soaring to 35°C (96°F). Expect a precipitation amount of 186 mm (7.3 in) spread over 16 days, complemented by a high average humidity of 86%.

September Temperature in Yashio

In September in Yashio, the average temperature is 24°C (75°F), with maximums reaching 35°C (96°F) and minimums dipping as low as 13°C (56°F). This makes it a great time to visit for those who enjoy warm weather, while also being prepared for cooler evenings.

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

The chart illustrates September temperature patterns in Yashio, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Yashio, September typically has an average temperature of 24°C (75°F), with highs reaching up to 35°C (96°F) and lows dropping to around 13°C (56°F).

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

September Precipitation in Yashio

In Yashio in September, the precipitation amount is 186 mm (7.3 in) over the course of 16 days.

September Precipitation Trends in Yashio

The chart displays monthly precipitation patterns in Yashio, 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 Yashio, September typically receives around 186 mm (7.3 inches) of precipitation spread over approximately 16 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 Yashio

In Yashio in September, humidity is 86%. With an average temperature of 24°C (75°F), this humidity feels like a warm, sticky embrace, making outdoor activities somewhat uncomfortable and requiring travelers to stay hydrated and take breaks in the shade.

September Average Humidity in Yashio

This chart illustrates the average monthly humidity levels in Yashio, 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 Yashio is approximately 86%, 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 Yashio

In Yashio 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 Yashio.

Maximum UV Index Levels in Yashio for September

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

Data source: Yashio 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 Yashio Compares to Other Months

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

This table compares monthly weather conditions in Yashio, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (41°F)	46 mm (1.8 inches)	76%	moderate
February Weather	6°C (43°F)	41 mm (1.6 inches)	74%	moderate
March Weather	10°C (51°F)	132 mm (5.2 inches)	70%	very high
April Weather	14°C (58°F)	116 mm (4.6 inches)	74%	very high
May Weather	20°C (68°F)	111 mm (4.4 inches)	81%	extreme
June Weather	23°C (73°F)	152 mm (6.0 inches)	88%	extreme
July Weather	26°C (79°F)	221 mm (8.7 inches)	93%	extreme
August Weather	28°C (83°F)	103 mm (4.1 inches)	90%	extreme
September Weather	24°C (75°F)	186 mm (7.3 inches)	86%	very high
October Weather	19°C (66°F)	273 mm (10.7 inches)	83%	high
November Weather	13°C (56°F)	77 mm (3.0 inches)	80%	moderate
December Weather	8°C (46°F)	56 mm (2.2 inches)	78%	moderate