September Weather in Chonan, Japan

Last updated: August 23, 2025

In September, the average temperature in Chonan, Japan is a pleasant 24°C (76°F). You'll experience a range from a cool 16°C (61°F) to a warm 33°C (92°F). Be prepared for some rain, as 192 mm (7.6 in) of precipitation is expected over 16 days. Finally, with an average humidity of 83%, it’s best to stay hydrated and enjoy the lush surroundings!

September Temperature in Chonan

In September in Chonan, the average temperature is 24°C (76°F). Maximums can reach 33°C (92°F), while minimums can drop to as low as 16°C (61°F). This pleasant weather makes Chonan an ideal destination for travelers seeking a comfortable climate.

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

The chart illustrates September temperature patterns in Chonan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chonan, September typically has an average temperature of 24°C (76°F), with highs reaching up to 33°C (92°F) and lows dropping to around 16°C (61°F).

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

September Precipitation in Chonan

In Chonan in September, the precipitation amount is 192 mm (7.6 in) during a span of 16 days.

September Precipitation Trends in Chonan

The chart displays monthly precipitation patterns in Chonan, 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 Chonan, September typically receives around 192 mm (7.6 inches) of precipitation spread over approximately 16 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 Chonan

In Chonan in September, humidity is 83%. With an average temperature of 24°C (76°F), this humidity feels like a thick blanket enveloping you, making every step feel heavier and possibly causing travelers to sweat more quickly, prompting frequent breaks in shaded areas or the search for refreshing beverages.

September Average Humidity in Chonan

This chart illustrates the average monthly humidity levels in Chonan, 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 Chonan is approximately 83%, 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 Chonan

In Chonan 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 Chonan.

Maximum UV Index Levels in Chonan for September

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

Data source: Chonan 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 Chonan Compares to Other Months

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

This table compares monthly weather conditions in Chonan, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	6°C (44°F)	58 mm (2.3 inches)	70%	moderate
February Weather	7°C (45°F)	49 mm (1.9 inches)	69%	moderate
March Weather	11°C (52°F)	148 mm (5.8 inches)	68%	very high
April Weather	15°C (58°F)	117 mm (4.6 inches)	73%	very high
May Weather	19°C (67°F)	131 mm (5.1 inches)	81%	extreme
June Weather	22°C (72°F)	171 mm (6.7 inches)	88%	extreme
July Weather	26°C (79°F)	205 mm (8.1 inches)	94%	extreme
August Weather	28°C (82°F)	105 mm (4.1 inches)	87%	extreme
September Weather	24°C (76°F)	192 mm (7.6 inches)	83%	very high
October Weather	19°C (67°F)	271 mm (10.7 inches)	78%	high
November Weather	15°C (59°F)	107 mm (4.2 inches)	74%	moderate
December Weather	9°C (49°F)	78 mm (3.1 inches)	72%	moderate