September Weather in Sasayama, Japan

Last updated: August 23, 2025

In September, the average temperature in Sasayama, Japan hovers around 23°C (75°F). Be prepared for a temperature range that can swing from a cool 12°C (53°F) to a warm 34°C (94°F). Expect approximately 205 mm (8.1 in) of precipitation spread over about 14 days, with an average humidity level of 87%, making the air feel quite humid. Stay comfortable and enjoy the weather!

September Temperature in Sasayama

In September in Sasayama, the average temperature is 23°C (75°F). Maximums can reach 34°C (94°F), while minimums can drop as low as 12°C (53°F). This makes Sasayama an ideal destination for travelers seeking a warm climate with pleasant variations in temperature.

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

The chart illustrates September temperature patterns in Sasayama, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sasayama, September typically has an average temperature of 23°C (75°F), with highs reaching up to 34°C (94°F) and lows dropping to around 12°C (53°F).

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

September Precipitation in Sasayama

In Sasayama in September, the total precipitation amounts to 205 mm (8.1 in) over the course of 14 days.

September Precipitation Trends in Sasayama

The chart displays monthly precipitation patterns in Sasayama, 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 Sasayama, September typically receives around 205 mm (8.1 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 Sasayama

In Sasayama in September, humidity is 87%. With an average temperature of 23°C (75°F), this humidity feels like a warm, thick blanket wrapping around you, making outdoor activities feel sticky and uncomfortable, and often leaving you longing for shade and refreshing breezes while exploring.

September Average Humidity in Sasayama

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

In Sasayama 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 Sasayama.

Maximum UV Index Levels in Sasayama for September

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

Data source: Sasayama 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 Sasayama Compares to Other Months

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

This table compares monthly weather conditions in Sasayama, 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 (40°F)	46 mm (1.8 inches)	82%	moderate
February Weather	5°C (41°F)	59 mm (2.3 inches)	79%	high
March Weather	9°C (49°F)	111 mm (4.4 inches)	74%	very high
April Weather	13°C (56°F)	141 mm (5.6 inches)	76%	very high
May Weather	19°C (66°F)	140 mm (5.5 inches)	83%	extreme
June Weather	22°C (72°F)	147 mm (5.8 inches)	87%	extreme
July Weather	26°C (79°F)	327 mm (12.9 inches)	93%	extreme
August Weather	28°C (82°F)	223 mm (8.8 inches)	91%	extreme
September Weather	23°C (75°F)	205 mm (8.1 inches)	87%	very high
October Weather	18°C (65°F)	230 mm (9.1 inches)	85%	high
November Weather	12°C (54°F)	43 mm (1.7 inches)	83%	moderate
December Weather	6°C (44°F)	60 mm (2.4 inches)	83%	moderate