September Weather in Katano, Japan

Last updated: August 23, 2025

The average temperature in Katano, Japan during September is a comfortable 25°C (78°F). However, temperatures can swing from a refreshing 15°C (59°F) to a sizzling 38°C (100°F). Expect around 142 mm (5.6 in) of precipitation spread over 13 days, contributing to a high average humidity of 87%.

September Temperature in Katano

In September in Katano, the average temperature is 25°C (78°F). Maximums can reach 38°C (100°F), while minimums can drop to as low as 15°C (59°F). Be prepared for warm days and cool evenings when planning your travels!

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

The chart illustrates September temperature patterns in Katano, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Katano, September typically has an average temperature of 25°C (78°F), with highs reaching up to 38°C (100°F) and lows dropping to around 15°C (59°F).

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

September Precipitation in Katano

In Katano in September, the precipitation amount is 142 mm (5.6 in) spread over 13 days.

September Precipitation Trends in Katano

The chart displays monthly precipitation patterns in Katano, 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 Katano, September typically receives around 142 mm (5.6 inches) of precipitation spread over approximately 13 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Katano

In Katano in September, humidity is 87%. With an average temperature of 25°C (78°F), this humidity feels like a warm, heavy blanket enveloping you, making outdoor activities particularly strenuous and requiring frequent breaks for hydration and shade.

September Average Humidity in Katano

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

In Katano 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 Katano.

Maximum UV Index Levels in Katano for September

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

Data source: Katano 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 Katano Compares to Other Months

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

This table compares monthly weather conditions in Katano, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (42°F)	48 mm (1.9 inches)	82%	moderate
February Weather	6°C (43°F)	60 mm (2.4 inches)	79%	high
March Weather	10°C (51°F)	110 mm (4.3 inches)	74%	very high
April Weather	15°C (59°F)	129 mm (5.1 inches)	76%	extreme
May Weather	20°C (68°F)	144 mm (5.7 inches)	83%	extreme
June Weather	24°C (75°F)	140 mm (5.5 inches)	87%	extreme
July Weather	28°C (82°F)	245 mm (9.7 inches)	93%	extreme
August Weather	29°C (85°F)	150 mm (5.9 inches)	91%	extreme
September Weather	25°C (78°F)	142 mm (5.6 inches)	87%	very high
October Weather	19°C (67°F)	226 mm (8.9 inches)	85%	high
November Weather	13°C (56°F)	40 mm (1.6 inches)	83%	moderate
December Weather	8°C (46°F)	55 mm (2.2 inches)	83%	moderate