September Weather in Koseda, Japan

Last updated: August 23, 2025

In Koseda, Japan, the average temperature in September hovers around 27°C (80°F), creating a warm and inviting climate. Expect minimums of 22°C (71°F) and highs reaching 29°C (85°F). However, with 281 mm (11.1 in) of precipitation spread over 20 days, you might want to carry an umbrella. The average humidity stands at a tropical 80%, adding to the sultry atmosphere of this vibrant location.

September Temperature in Koseda

In September in Koseda, the average temperature is 27°C (80°F). Maximums can reach 29°C (85°F) and minimums can drop to as low as 22°C (71°F). This pleasant weather makes it an ideal time for traveling and exploring the beautiful attractions in Koseda.

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

The chart illustrates September temperature patterns in Koseda, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Koseda, September typically has an average temperature of 27°C (80°F), with highs reaching up to 29°C (85°F) and lows dropping to around 22°C (71°F).

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

September Precipitation in Koseda

In Koseda in September, the total precipitation amount is 281 mm (11.1 in) spread over 20 days, indicating a significant amount of rainfall for that period.

September Precipitation Trends in Koseda

The chart displays monthly precipitation patterns in Koseda, 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 Koseda, September typically receives around 281 mm (11.1 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 Koseda

In Koseda in September humidity is 80%. With an average temperature of 27°C (80°F), this humidity feels like a warm, heavy blanket enveloping you, making outdoor activities feel more exhausting and sticky, and challenging you to stay hydrated while exploring.

September Average Humidity in Koseda

This chart illustrates the average monthly humidity levels in Koseda, 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 Koseda is approximately 80%, 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 Koseda

In Koseda 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 Koseda.

Maximum UV Index Levels in Koseda for September

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

Data source: Koseda 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 Koseda Compares to Other Months

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

This table compares monthly weather conditions in Koseda, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	13°C (56°F)	102 mm (4.0 inches)	72%	moderate
February Weather	13°C (56°F)	151 mm (6.0 inches)	68%	high
March Weather	16°C (61°F)	201 mm (7.9 inches)	72%	very high
April Weather	18°C (66°F)	172 mm (6.8 inches)	79%	extreme
May Weather	21°C (71°F)	251 mm (9.9 inches)	83%	extreme
June Weather	24°C (75°F)	469 mm (18.5 inches)	86%	extreme
July Weather	27°C (81°F)	250 mm (9.8 inches)	90%	extreme
August Weather	28°C (82°F)	200 mm (7.9 inches)	85%	extreme
September Weather	27°C (80°F)	281 mm (11.1 inches)	80%	extreme
October Weather	23°C (75°F)	173 mm (6.8 inches)	78%	very high
November Weather	19°C (67°F)	153 mm (6.0 inches)	76%	high
December Weather	15°C (60°F)	132 mm (5.2 inches)	74%	moderate