September Weather in Saku, Japan

Last updated: August 23, 2025

In September, the average temperature in Saku, Japan is a pleasant 19°C (66°F). Visitors should prepare for variations, as temperatures can dip to a minimum of 8°C (47°F) and rise to a maximum of 29°C (85°F). Rain is expected, with 185 mm (7.3 in) of precipitation spread over 20 days, contributing to a humid atmosphere with an average humidity of 89%.

September Temperature in Saku

In September in Saku, the average temperature is 19°C (66°F). Maximums can reach 29°C (85°F), while minimums can dip as low as 8°C (47°F). This makes it a great time for travelers to enjoy moderate weather and diverse outdoor activities.

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

The chart illustrates September temperature patterns in Saku, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saku, September typically has an average temperature of 19°C (66°F), with highs reaching up to 29°C (85°F) and lows dropping to around 8°C (47°F).

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

September Precipitation in Saku

In Saku in September, the total precipitation amount is 185 mm (7.3 in) over a span of 20 days.

September Precipitation Trends in Saku

The chart displays monthly precipitation patterns in Saku, 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 Saku, September typically receives around 185 mm (7.3 inches) of precipitation spread over approximately 20 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 Saku

In Saku in September humidity is 89%. With an average temperature of 19°C (66°F), this humidity feels like walking through a damp blanket, making every step more laborious and the air thick, potentially leading to discomfort while exploring or sightseeing.

September Average Humidity in Saku

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

In Saku 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 Saku.

Maximum UV Index Levels in Saku for September

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

Data source: Saku 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 Saku Compares to Other Months

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

This table compares monthly weather conditions in Saku, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	0°C (31°F)	48 mm (1.9 inches)	88%	moderate
February Weather	1°C (33°F)	49 mm (1.9 inches)	86%	high
March Weather	5°C (41°F)	106 mm (4.2 inches)	81%	very high
April Weather	9°C (49°F)	105 mm (4.1 inches)	78%	very high
May Weather	15°C (59°F)	142 mm (5.6 inches)	81%	extreme
June Weather	18°C (65°F)	193 mm (7.6 inches)	88%	extreme
July Weather	22°C (72°F)	287 mm (11.3 inches)	92%	extreme
August Weather	23°C (75°F)	190 mm (7.5 inches)	92%	extreme
September Weather	19°C (66°F)	185 mm (7.3 inches)	89%	very high
October Weather	13°C (56°F)	253 mm (9.9 inches)	87%	high
November Weather	7°C (45°F)	38 mm (1.5 inches)	85%	moderate
December Weather	2°C (36°F)	50 mm (2.0 inches)	86%	moderate