September Weather in Yoichi, Japan

Last updated: August 23, 2025

In September, the average temperature in Yoichi, Japan hovers around 18°C (65°F), offering a pleasant climate. Expect minimums of 9°C (48°F) and maximums reaching 28°C (82°F), making it ideal for a variety of outdoor activities. However, be prepared for some rain, as 106 mm (4.2 in) of precipitation is recorded over 14 days. The air's average humidity is fairly high at 88%, contributing to a refreshing atmosphere.

September Temperature in Yoichi

In September in Yoichi, the average temperature is 18°C (65°F). The maximum can reach 28°C (82°F), while the minimum can drop to as low as 9°C (48°F). This mild weather makes it an ideal time for travelers to explore the sights and enjoy outdoor activities.

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

The chart illustrates September temperature patterns in Yoichi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Yoichi, September typically has an average temperature of 18°C (65°F), with highs reaching up to 28°C (82°F) and lows dropping to around 9°C (48°F).

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

September Precipitation in Yoichi

In Yoichi in September, the precipitation amount is 106 mm (4.2 in) over a period of 14 days.

September Precipitation Trends in Yoichi

The chart displays monthly precipitation patterns in Yoichi, 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 Yoichi, September typically receives around 106 mm (4.2 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 Yoichi

In Yoichi in September, humidity is 88%. With an average temperature of 18°C (65°F), this humidity feels like a warm blanket wrapping around you, making travel feel slightly sticky and the air thick, which can be quite tiring when exploring the area.

September Average Humidity in Yoichi

This chart illustrates the average monthly humidity levels in Yoichi, 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 Yoichi is approximately 88%, 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 Yoichi

In Yoichi in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Yoichi.

Maximum UV Index Levels in Yoichi for September

The chart shows the monthly maximum UV Index (UVI) for Yoichi 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 Yoichi typically reaches 8, which falls under the very high exposure category.

Data source: Yoichi 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 Yoichi Compares to Other Months

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

This table compares monthly weather conditions in Yoichi, 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 (26°F)	93 mm (3.7 inches)	84%	low
February Weather	-3°C (27°F)	103 mm (4.0 inches)	83%	moderate
March Weather	1°C (35°F)	93 mm (3.7 inches)	81%	moderate
April Weather	5°C (42°F)	76 mm (3.0 inches)	81%	high
May Weather	12°C (53°F)	83 mm (3.3 inches)	86%	very high
June Weather	15°C (59°F)	99 mm (3.9 inches)	87%	very high
July Weather	20°C (69°F)	78 mm (3.1 inches)	93%	very high
August Weather	21°C (71°F)	149 mm (5.9 inches)	95%	very high
September Weather	18°C (65°F)	106 mm (4.2 inches)	88%	very high
October Weather	12°C (54°F)	146 mm (5.8 inches)	83%	moderate
November Weather	5°C (42°F)	170 mm (6.7 inches)	79%	moderate
December Weather	-1°C (30°F)	146 mm (5.7 inches)	80%	low