September Weather in Saikai, Japan

Last updated: August 23, 2025

In Saikai, Japan, the average temperature in September is a comfortable 25°C (77°F). Temperatures can dip to a minimum of 19°C (67°F) and soar to a maximum of 33°C (91°F). Humidity is high, averaging around 84%, while precipitation totals 223 mm (8.8 in) over 14 days, making for a wet yet warm month.

September Temperature in Saikai

In September in Saikai, the average temperature is 25°C (77°F). The maximum can reach 33°C (91°F) and the minimum can be as low as 19°C (67°F). This pleasant weather makes Saikai an ideal destination for travelers looking to enjoy a warm climate.

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

The chart illustrates September temperature patterns in Saikai, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saikai, September typically has an average temperature of 25°C (77°F), with highs reaching up to 33°C (91°F) and lows dropping to around 19°C (67°F).

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

September Precipitation in Saikai

In Saikai in September, the total precipitation amount is 223 mm (8.8 in) over a span of 14 days, indicating a significant rainfall during that period.

September Precipitation Trends in Saikai

The chart displays monthly precipitation patterns in Saikai, 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 Saikai, September typically receives around 223 mm (8.8 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 Saikai

In Saikai 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 Saikai

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

In Saikai 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 Saikai.

Maximum UV Index Levels in Saikai for September

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

Data source: Saikai 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 Saikai Compares to Other Months

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

This table compares monthly weather conditions in Saikai, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	8°C (47°F)	58 mm (2.3 inches)	73%	moderate
February Weather	9°C (48°F)	93 mm (3.6 inches)	69%	high
March Weather	12°C (54°F)	147 mm (5.8 inches)	71%	very high
April Weather	15°C (60°F)	130 mm (5.1 inches)	79%	very high
May Weather	19°C (67°F)	206 mm (8.1 inches)	87%	extreme
June Weather	23°C (73°F)	231 mm (9.1 inches)	91%	extreme
July Weather	26°C (79°F)	393 mm (15.5 inches)	97%	extreme
August Weather	28°C (82°F)	320 mm (12.6 inches)	94%	extreme
September Weather	25°C (77°F)	223 mm (8.8 inches)	84%	extreme
October Weather	21°C (69°F)	110 mm (4.3 inches)	79%	high
November Weather	16°C (60°F)	65 mm (2.6 inches)	75%	high
December Weather	10°C (51°F)	81 mm (3.2 inches)	72%	moderate