September Weather in Sumoto, Japan

Last updated: August 23, 2025

In September, the average temperature in Sumoto, Japan is a pleasant 25°C (77°F). Expect minimums around 20°C (67°F) and highs reaching 29°C (85°F). While you enjoy the warmth, be prepared for some rain, with 206 mm (8.1 in) expected over 13 days. Don't forget, humidity will be high at 87%, adding a touch of tropical flair to your experience!

September Temperature in Sumoto

In September in Sumoto, the average temperature is 25°C (77°F). Maximums can reach 29°C (85°F) while minimums can dip as low as 20°C (67°F). This pleasant climate makes it an ideal time for travelers to explore and enjoy outdoor activities.

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

The chart illustrates September temperature patterns in Sumoto, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sumoto, September typically has an average temperature of 25°C (77°F), with highs reaching up to 29°C (85°F) and lows dropping to around 20°C (67°F).

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

September Precipitation in Sumoto

In Sumoto in September, the precipitation amount is 206 mm (8.1 in) spread over 13 days.

September Precipitation Trends in Sumoto

The chart displays monthly precipitation patterns in Sumoto, 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 Sumoto, September typically receives around 206 mm (8.1 inches) of precipitation spread over approximately 13 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 Sumoto

In Sumoto in September, humidity is 87%. With an average temperature of 25°C (77°F), this humidity feels like a thick, warm blanket enveloping you, making travel a challenge as sweat clings to your skin and the air feels heavy and stifling.

September Average Humidity in Sumoto

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

In Sumoto 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 Sumoto.

Maximum UV Index Levels in Sumoto for September

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

Data source: Sumoto 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 Sumoto Compares to Other Months

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

This table compares monthly weather conditions in Sumoto, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	8°C (46°F)	65 mm (2.6 inches)	82%	moderate
February Weather	8°C (46°F)	74 mm (2.9 inches)	79%	moderate
March Weather	10°C (51°F)	117 mm (4.6 inches)	73%	very high
April Weather	14°C (57°F)	132 mm (5.2 inches)	74%	extreme
May Weather	18°C (64°F)	171 mm (6.7 inches)	84%	extreme
June Weather	21°C (70°F)	192 mm (7.5 inches)	86%	extreme
July Weather	25°C (78°F)	291 mm (11.5 inches)	92%	extreme
August Weather	27°C (81°F)	154 mm (6.1 inches)	92%	extreme
September Weather	25°C (77°F)	206 mm (8.1 inches)	87%	very high
October Weather	20°C (69°F)	292 mm (11.5 inches)	85%	high
November Weather	16°C (60°F)	68 mm (2.7 inches)	84%	moderate
December Weather	11°C (51°F)	83 mm (3.3 inches)	82%	moderate