September Weather in Iwata, Japan

Last updated: August 23, 2025

In Iwata, Japan, the average temperature in September hovers around 25°C (77°F), with a minimum drop to 15°C (60°F) and a maximum soaring to 36°C (96°F). During this period, expect precipitation of about 222 mm (8.7 in) spread over 20 days, accompanied by an average humidity level of 86%. Perfect for those who enjoy a warm, tropical climate!

September Temperature in Iwata

In September in Iwata, the average temperature is 25°C (77°F). Maximums can reach 36°C (96°F), while minimums can be as low as 15°C (60°F). Be prepared for warm weather and pack accordingly to enjoy your travels.

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

The chart illustrates September temperature patterns in Iwata, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Iwata, September typically has an average temperature of 25°C (77°F), with highs reaching up to 36°C (96°F) and lows dropping to around 15°C (60°F).

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

September Precipitation in Iwata

In Iwata in September, the total precipitation amount is 222 mm (8.7 in) over the course of 20 days.

September Precipitation Trends in Iwata

The chart displays monthly precipitation patterns in Iwata, 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 Iwata, September typically receives around 222 mm (8.7 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 Iwata

In Iwata in September, humidity is 86%. With an average temperature of 25°C (77°F), this humidity feels like you are wrapped in a warm, heavy blanket, making travel a bit challenging as you may find yourself frequently seeking shade and hydration while navigating the vibrant streets.

September Average Humidity in Iwata

This chart illustrates the average monthly humidity levels in Iwata, 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 Iwata is approximately 86%, 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 Iwata

In Iwata 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 Iwata.

Maximum UV Index Levels in Iwata for September

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

Data source: Iwata 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 Iwata Compares to Other Months

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

This table compares monthly weather conditions in Iwata, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	7°C (44°F)	51 mm (2.0 inches)	76%	moderate
February Weather	7°C (46°F)	76 mm (3.0 inches)	74%	moderate
March Weather	12°C (53°F)	166 mm (6.5 inches)	70%	very high
April Weather	15°C (60°F)	172 mm (6.8 inches)	74%	very high
May Weather	20°C (68°F)	198 mm (7.8 inches)	81%	extreme
June Weather	23°C (74°F)	261 mm (10.3 inches)	88%	extreme
July Weather	27°C (81°F)	408 mm (16.1 inches)	93%	extreme
August Weather	29°C (84°F)	197 mm (7.8 inches)	90%	extreme
September Weather	25°C (77°F)	222 mm (8.7 inches)	86%	very high
October Weather	20°C (68°F)	293 mm (11.5 inches)	83%	high
November Weather	15°C (58°F)	83 mm (3.3 inches)	80%	moderate
December Weather	9°C (49°F)	67 mm (2.6 inches)	78%	moderate