September Weather in Florence, United States

Last updated: June 24, 2025

In Florence, United States, the average temperature in September hovers around 25°C (77°F), creating a pleasantly warm atmosphere. Expect a minimum of 10°C (50°F) and a peak of 36°C (97°F), providing a wide range of weather experiences. During this time, precipitation averages 160 mm (6.3 in) over 9 days, while the air remains comfortably humid with an average of 79% humidity. Enjoy the vibrant climate of this location!

September Temperature in Florence

In September in Florence, the average temperature is 25°C (77°F). The maximum can reach 36°C (97°F), and the minimum can be as low as 10°C (50°F). This makes it an ideal time for traveling, as the warm days are perfect for outdoor activities while cooler evenings allow for comfortable exploration.

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

The chart illustrates September temperature patterns in Florence, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Florence, September typically has an average temperature of 25°C (77°F), with highs reaching up to 36°C (97°F) and lows dropping to around 10°C (50°F).

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

September Precipitation in Florence

In Florence in September, the total precipitation amount is 160 mm (6.3 in) over the course of 9 days.

September Precipitation Trends in Florence

The chart displays monthly precipitation patterns in Florence, 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 Florence, September typically receives around 160 mm (6.3 inches) of precipitation spread over approximately 9 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 Florence

In Florence in September, humidity is 79%. With an average temperature of 25°C (77°F), this humidity feels like a warm blanket wrapping around you, making travel feel slightly sluggish but pleasantly tropical.

September Average Humidity in Florence

This chart illustrates the average monthly humidity levels in Florence, 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 Florence is approximately 79%, 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 Florence

In Florence in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Florence.

Maximum UV Index Levels in Florence for September

The chart shows the monthly maximum UV Index (UVI) for Florence 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 Florence typically reaches 9, which falls under the very high exposure category.

Data source: Florence 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 Florence Compares to Other Months

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

This table compares monthly weather conditions in Florence, 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 (48°F)	78 mm (3.1 inches)	85%	moderate
February Weather	12°C (53°F)	96 mm (3.8 inches)	82%	high
March Weather	14°C (57°F)	67 mm (2.6 inches)	81%	very high
April Weather	18°C (65°F)	95 mm (3.7 inches)	80%	very high
May Weather	23°C (74°F)	121 mm (4.8 inches)	81%	extreme
June Weather	26°C (78°F)	139 mm (5.5 inches)	81%	extreme
July Weather	27°C (81°F)	140 mm (5.5 inches)	81%	extreme
August Weather	27°C (80°F)	154 mm (6.0 inches)	80%	very high
September Weather	25°C (77°F)	160 mm (6.3 inches)	79%	very high
October Weather	20°C (68°F)	56 mm (2.2 inches)	80%	very high
November Weather	12°C (55°F)	75 mm (3.0 inches)	85%	high
December Weather	10°C (50°F)	138 mm (5.4 inches)	86%	moderate