September Weather in Ajigasawa, Japan

Last updated: August 23, 2025

In September, the average temperature in Ajigasawa, Japan is a pleasant 20°C (68°F). Expect a minimum temperature of 10°C (51°F) and a maximum of 33°C (91°F), offering a comfortable range. However, be prepared for some showers, as the region experiences an average precipitation of 144 mm (5.7 in) over approximately 14 days. With an average humidity of 89%, it’s advisable to stay hydrated and enjoy the lush surroundings!

September Temperature in Ajigasawa

In September in Ajigasawa, the average temperature is 20°C (68°F), with maximums reaching up to 33°C (91°F) and minimums dropping as low as 10°C (51°F). This varied climate makes it an ideal time for travelers to enjoy a range of outdoor activities while also experiencing comfortable evenings.

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

The chart illustrates September temperature patterns in Ajigasawa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ajigasawa, September typically has an average temperature of 20°C (68°F), with highs reaching up to 33°C (91°F) and lows dropping to around 10°C (51°F).

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

September Precipitation in Ajigasawa

In Ajigasawa in September, the precipitation amount is 144 mm (5.7 in) over the course of 14 days.

September Precipitation Trends in Ajigasawa

The chart displays monthly precipitation patterns in Ajigasawa, 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 Ajigasawa, September typically receives around 144 mm (5.7 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 Ajigasawa

In Ajigasawa in September, humidity is 89%. With an average temperature of 20°C (68°F), this humidity feels like walking through a warm, damp blanket that clings to your skin, making each step feel heavier and the air thick with moisture, which can be quite uncomfortable for traveling.

September Average Humidity in Ajigasawa

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

In Ajigasawa 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 Ajigasawa.

Maximum UV Index Levels in Ajigasawa for September

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

Data source: Ajigasawa 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 Ajigasawa Compares to Other Months

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

This table compares monthly weather conditions in Ajigasawa, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-1°C (31°F)	125 mm (4.9 inches)	79%	moderate
February Weather	0°C (32°F)	141 mm (5.6 inches)	78%	moderate
March Weather	3°C (38°F)	120 mm (4.7 inches)	77%	high
April Weather	8°C (46°F)	122 mm (4.8 inches)	78%	very high
May Weather	14°C (57°F)	115 mm (4.5 inches)	86%	very high
June Weather	18°C (64°F)	139 mm (5.5 inches)	91%	very high
July Weather	22°C (73°F)	130 mm (5.1 inches)	95%	very high
August Weather	24°C (75°F)	187 mm (7.4 inches)	97%	extreme
September Weather	20°C (68°F)	144 mm (5.7 inches)	89%	very high
October Weather	14°C (58°F)	192 mm (7.5 inches)	81%	high
November Weather	8°C (47°F)	151 mm (6.0 inches)	78%	moderate
December Weather	2°C (35°F)	211 mm (8.3 inches)	77%	low