September Weather in Iki, Japan

Last updated: August 23, 2025

In Iki, Japan, the average temperature in September hovers around 25°C (77°F), with minimums dipping to 20°C (69°F) and maximums rising to 31°C (88°F). Expect 235 mm (9.2 in) of precipitation over 15 days, contributing to a notably high average humidity of 84%.

September Temperature in Iki

In September in Iki, the average temperature is 25°C (77°F), with maximums reaching 31°C (88°F) and minimums dipping as low as 20°C (69°F). This makes it an ideal destination for travelers seeking warm and pleasant weather for outdoor activities and exploration.

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

The chart illustrates September temperature patterns in Iki, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Iki, September typically has an average temperature of 25°C (77°F), with highs reaching up to 31°C (88°F) and lows dropping to around 20°C (69°F).

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

September Precipitation in Iki

In Iki in September, the total precipitation amount is 235 mm (9.2 in), occurring over a span of 15 days.

September Precipitation Trends in Iki

The chart displays monthly precipitation patterns in Iki, 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 Iki, September typically receives around 235 mm (9.2 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 Iki

In Iki in September, humidity is 84%. With an average temperature of 25°C (77°F), this humidity feels like a warm, enveloping blanket that clings to your skin, making outdoor activities challenging and prompting travelers to seek shade and stay hydrated.

September Average Humidity in Iki

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

In Iki in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Iki.

Maximum UV Index Levels in Iki for September

The chart shows the monthly maximum UV Index (UVI) for Iki 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 Iki typically reaches 11, which falls under the extreme exposure category.

Data source: Iki 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 Iki Compares to Other Months

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

This table compares monthly weather conditions in Iki, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	9°C (49°F)	76 mm (3.0 inches)	73%	moderate
February Weather	9°C (49°F)	75 mm (3.0 inches)	69%	high
March Weather	12°C (54°F)	141 mm (5.5 inches)	71%	very high
April Weather	15°C (59°F)	117 mm (4.6 inches)	79%	very high
May Weather	18°C (65°F)	137 mm (5.4 inches)	87%	extreme
June Weather	21°C (71°F)	181 mm (7.1 inches)	91%	extreme
July Weather	25°C (78°F)	312 mm (12.3 inches)	97%	extreme
August Weather	27°C (82°F)	260 mm (10.2 inches)	94%	extreme
September Weather	25°C (77°F)	235 mm (9.2 inches)	84%	extreme
October Weather	21°C (70°F)	108 mm (4.2 inches)	79%	high
November Weather	16°C (62°F)	50 mm (2.0 inches)	75%	high
December Weather	11°C (52°F)	84 mm (3.3 inches)	72%	moderate