September Weather in Florence, United States

Last updated: June 24, 2025

In Florence, United States, the average temperature in September reaches a warm 31°C (87°F), with extremes ranging from a cool 13°C (55°F) to a scorching 44°C (112°F). Expect 24 mm (1.0 in) of precipitation over 3 days, accompanied by an average humidity of 64%.

September Temperature in Florence

In September in Florence, the average temperature is 31°C (87°F), with maximums reaching up to 44°C (112°F) and minimums dropping as low as 13°C (55°F). Be prepared for a range of temperatures, ensuring you pack both light clothing for the heat and layers for cooler evenings.

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 31°C (87°F), with highs reaching up to 44°C (112°F) and lows dropping to around 13°C (55°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 24 mm (1.0 in) accumulated over a period of 3 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 24 mm (1.0 inches) of precipitation spread over approximately 3 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 64%. With an average temperature of 31°C (87°F), this humidity feels like a warm, thick blanket wrapping around you, making travel a bit heavy and sticky as you navigate through the sights and sounds of the area.

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 64%, 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 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 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 10, 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	12°C (54°F)	27 mm (1.0 inches)	76%	moderate
February Weather	14°C (57°F)	31 mm (1.2 inches)	79%	high
March Weather	18°C (64°F)	20 mm (0.8 inches)	67%	very high
April Weather	23°C (74°F)	2 mm (0.1 inches)	55%	extreme
May Weather	27°C (81°F)	2 mm (0.1 inches)	40%	extreme
June Weather	33°C (91°F)	5 mm (0.2 inches)	33%	extreme
July Weather	34°C (93°F)	41 mm (1.6 inches)	34%	extreme
August Weather	34°C (93°F)	36 mm (1.4 inches)	48%	extreme
September Weather	31°C (87°F)	24 mm (1.0 inches)	64%	very high
October Weather	24°C (76°F)	14 mm (0.5 inches)	67%	very high
November Weather	18°C (66°F)	17 mm (0.7 inches)	77%	moderate
December Weather	13°C (55°F)	27 mm (1.1 inches)	82%	moderate