September Weather in Defiance, United States

Last updated: June 24, 2025

In September, the average temperature in Defiance, United States is a comfortable 20°C (68°F). However, you can expect variations, with minimum temperatures dipping to 4°C (39°F) and peaks reaching a warm 34°C (93°F). This month typically sees 66 mm (2.6 in) of precipitation spread over about 8 days, coupled with an average humidity level of 78%. Whether you're enjoying the warmth or braving the rain, September offers a diverse climate for all!

September Temperature in Defiance

In September in Defiance, the average temperature is 20°C (68°F). The maximum can reach 34°C (93°F), while the minimum can be as low as 4°C (39°F). Overall, this month offers a pleasant variety of temperatures, making it an excellent time for travelers to explore the region.

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

The chart illustrates September temperature patterns in Defiance, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Defiance, September typically has an average temperature of 20°C (68°F), with highs reaching up to 34°C (93°F) and lows dropping to around 4°C (39°F).

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

September Precipitation in Defiance

In Defiance in September, the total precipitation amount is 66 mm (2.6 in) over the course of 8 days.

September Precipitation Trends in Defiance

The chart displays monthly precipitation patterns in Defiance, 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 Defiance, September typically receives around 66 mm (2.6 inches) of precipitation spread over approximately 8 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 Defiance

In Defiance in September humidity is 78%. With an average temperature of 20°C (68°F), this humidity feels like a warm, enveloping blanket that makes exploring the sights a bit sticky, so travelers should stay hydrated and take frequent breaks in the shade.

September Average Humidity in Defiance

This chart illustrates the average monthly humidity levels in Defiance, 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 Defiance is approximately 78%, 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 Defiance

In Defiance in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Defiance.

Maximum UV Index Levels in Defiance for September

The chart shows the monthly maximum UV Index (UVI) for Defiance 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 Defiance typically reaches 8, which falls under the very high exposure category.

Data source: Defiance 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 Defiance Compares to Other Months

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

This table compares monthly weather conditions in Defiance, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (29°F)	72 mm (2.8 inches)	88%	moderate
February Weather	-1°C (31°F)	74 mm (2.9 inches)	87%	moderate
March Weather	4°C (40°F)	93 mm (3.7 inches)	87%	high
April Weather	10°C (50°F)	94 mm (3.7 inches)	87%	very high
May Weather	17°C (62°F)	139 mm (5.5 inches)	81%	very high
June Weather	22°C (72°F)	121 mm (4.7 inches)	82%	very high
July Weather	24°C (76°F)	115 mm (4.5 inches)	81%	very high
August Weather	23°C (74°F)	92 mm (3.6 inches)	78%	very high
September Weather	20°C (68°F)	66 mm (2.6 inches)	78%	very high
October Weather	14°C (57°F)	91 mm (3.6 inches)	82%	high
November Weather	5°C (41°F)	84 mm (3.3 inches)	89%	moderate
December Weather	1°C (35°F)	57 mm (2.2 inches)	86%	low