September Weather in Izumi, Japan

Last updated: August 23, 2025

In Izumi, Japan, the average temperature in September hovers around 26°C (79°F). Expect minimums to dip to 19°C (66°F) and maximums to reach up to 33°C (92°F). Prepare for 261 mm (10.3 in) of precipitation spread over 17 days, contributing to an average humidity of 80%.

September Temperature in Izumi

In September in Izumi, the average temperature is 26°C (79°F), with maximums reaching 33°C (92°F) and minimums dropping to as low as 19°C (66°F). Overall, this makes it an ideal time for traveling, offering warm and pleasant weather for exploring the area.

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

The chart illustrates September temperature patterns in Izumi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Izumi, September typically has an average temperature of 26°C (79°F), with highs reaching up to 33°C (92°F) and lows dropping to around 19°C (66°F).

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

September Precipitation in Izumi

In Izumi in September, the precipitation amount is 261 mm (10.3 in) over a span of 17 days.

September Precipitation Trends in Izumi

The chart displays monthly precipitation patterns in Izumi, 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 Izumi, September typically receives around 261 mm (10.3 inches) of precipitation spread over approximately 17 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 Izumi

In Izumi in September humidity is 80%. With an average temperature of 26°C (79°F), this humidity feels like a heavy blanket, making outdoor activities feel sticky and exhausting, potentially dampening the travel experience and necessitating frequent breaks to cool down and hydrate.

September Average Humidity in Izumi

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

In Izumi 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 Izumi.

Maximum UV Index Levels in Izumi for September

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

Data source: Izumi 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 Izumi Compares to Other Months

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

This table compares monthly weather conditions in Izumi, 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)	64 mm (2.5 inches)	72%	moderate
February Weather	10°C (50°F)	108 mm (4.3 inches)	68%	high
March Weather	13°C (55°F)	162 mm (6.4 inches)	72%	very high
April Weather	16°C (61°F)	160 mm (6.3 inches)	79%	extreme
May Weather	20°C (68°F)	250 mm (9.9 inches)	83%	extreme
June Weather	23°C (74°F)	343 mm (13.5 inches)	86%	extreme
July Weather	27°C (81°F)	454 mm (17.9 inches)	90%	extreme
August Weather	28°C (83°F)	247 mm (9.7 inches)	85%	extreme
September Weather	26°C (79°F)	261 mm (10.3 inches)	80%	extreme
October Weather	22°C (71°F)	141 mm (5.6 inches)	78%	very high
November Weather	16°C (61°F)	114 mm (4.5 inches)	76%	high
December Weather	11°C (52°F)	101 mm (4.0 inches)	74%	moderate