September Weather in Soma, Japan

Last updated: August 23, 2025

In Soma, Japan, the average temperature in September hovers around 22°C (72°F), making it a pleasant time to visit. Expect a range from a minimum of 16°C (62°F) to a comfortable maximum of 30°C (86°F). However, be prepared for some wet days, as the region experiences approximately 191 mm (7.5 in) of precipitation over about 15 days, accompanied by an average humidity of 84%. Enjoy the vibrant weather while you explore!

September Temperature in Soma

In September in Soma, the average temperature is 22°C (72°F), with maximums reaching 30°C (86°F) and minimums dropping to as low as 16°C (62°F). This pleasant and mild climate makes it an ideal time for travelers to explore the area comfortably.

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

The chart illustrates September temperature patterns in Soma, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Soma, September typically has an average temperature of 22°C (72°F), with highs reaching up to 30°C (86°F) and lows dropping to around 16°C (62°F).

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

September Precipitation in Soma

In Soma in September, the total precipitation amount is 191 mm (7.5 in) over a span of 15 days.

September Precipitation Trends in Soma

The chart displays monthly precipitation patterns in Soma, 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 Soma, September typically receives around 191 mm (7.5 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 Soma

In Soma in September humidity is 84%. With an average temperature of 22°C (72°F), this humidity feels like a warm embrace, making travel feel slightly stifling but also lending a vibrant energy to the atmosphere, which can be both invigorating and tiring as you explore.

September Average Humidity in Soma

This chart illustrates the average monthly humidity levels in Soma, 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 Soma is approximately 84%, 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 Soma

In Soma in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Soma.

Maximum UV Index Levels in Soma for September

The chart shows the monthly maximum UV Index (UVI) for Soma 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 Soma typically reaches 9, which falls under the very high exposure category.

Data source: Soma 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 Soma Compares to Other Months

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

This table compares monthly weather conditions in Soma, 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 (40°F)	52 mm (2.1 inches)	76%	moderate
February Weather	5°C (41°F)	41 mm (1.6 inches)	75%	moderate
March Weather	7°C (46°F)	117 mm (4.6 inches)	72%	high
April Weather	11°C (51°F)	115 mm (4.5 inches)	73%	very high
May Weather	16°C (60°F)	119 mm (4.7 inches)	80%	very high
June Weather	19°C (66°F)	105 mm (4.1 inches)	87%	very high
July Weather	23°C (73°F)	239 mm (9.4 inches)	92%	extreme
August Weather	25°C (77°F)	158 mm (6.2 inches)	90%	extreme
September Weather	22°C (72°F)	191 mm (7.5 inches)	84%	very high
October Weather	18°C (64°F)	257 mm (10.1 inches)	80%	high
November Weather	13°C (55°F)	44 mm (1.7 inches)	77%	moderate
December Weather	7°C (45°F)	60 mm (2.4 inches)	77%	moderate