September Weather in Unnan, Japan

Last updated: August 23, 2025

In September, the average temperature in Unnan, Japan hovers around 22°C (72°F). Temperatures can range from a cool 12°C (54°F) to a warm 34°C (93°F), providing a variety of weather experiences. Expect significant precipitation, with about 238 mm (9.4 in) spread over approximately 15 days. With an average humidity of 87%, the atmosphere feels distinctly tropical, making it an ideal time to explore the lush surroundings!

September Temperature in Unnan

In September in Unnan, the average temperature is 22°C (72°F). The maximum can reach 34°C (93°F), and the minimum can be as low as 12°C (54°F). This pleasant climate makes it an ideal destination for travelers seeking both warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Unnan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Unnan, September typically has an average temperature of 22°C (72°F), with highs reaching up to 34°C (93°F) and lows dropping to around 12°C (54°F).

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

September Precipitation in Unnan

In Unnan in September, the precipitation amount is 238 mm (9.4 in) during a span of 15 days.

September Precipitation Trends in Unnan

The chart displays monthly precipitation patterns in Unnan, 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 Unnan, September typically receives around 238 mm (9.4 inches) of precipitation spread over approximately 15 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 Unnan

In Unnan in September humidity is 87%. With an average temperature of 22°C (72°F), this humidity feels like a warm blanket wrapping around you, making every step while traveling feel slightly heavier and more tedious, yet still refreshing in the shade.

September Average Humidity in Unnan

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

In Unnan 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 Unnan.

Maximum UV Index Levels in Unnan for September

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

Data source: Unnan 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 Unnan Compares to Other Months

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

This table compares monthly weather conditions in Unnan, 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)	96 mm (3.8 inches)	82%	moderate
February Weather	4°C (40°F)	102 mm (4.0 inches)	79%	moderate
March Weather	8°C (47°F)	138 mm (5.4 inches)	73%	very high
April Weather	13°C (55°F)	125 mm (4.9 inches)	74%	extreme
May Weather	18°C (65°F)	102 mm (4.0 inches)	84%	extreme
June Weather	21°C (70°F)	197 mm (7.7 inches)	86%	extreme
July Weather	25°C (78°F)	301 mm (11.9 inches)	92%	extreme
August Weather	27°C (81°F)	263 mm (10.4 inches)	92%	extreme
September Weather	22°C (72°F)	238 mm (9.4 inches)	87%	very high
October Weather	17°C (62°F)	172 mm (6.8 inches)	85%	high
November Weather	11°C (52°F)	58 mm (2.3 inches)	84%	moderate
December Weather	6°C (43°F)	121 mm (4.8 inches)	82%	moderate