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September Weather in Florence, United States

Last updated: June 24, 2025

In September, the average temperature in Florence, United States hovers around 26°C (80°F), creating a pleasant atmosphere for various activities. Temperatures can swing from a cool 10°C (51°F) to a warm 38°C (101°F), ensuring versatility in weather. Expect about 103 mm (4.1 in) of precipitation over 10 days, accompanied by an average humidity of 66%, making it a month of refreshing showers amidst warmth.

September Temperature in Florence

In September in Florence, the average temperature is 26°C (80°F). Maximums can reach 38°C (101°F), while minimums can drop to as low as 10°C (51°F). Be prepared for a wide range of temperatures when traveling during this month.

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 26°C (80°F), with highs reaching up to 38°C (101°F) and lows dropping to around 10°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec505263687682858679705954
Data source: Temperature data for Florence generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Florence

In Florence in September, the precipitation amount is 103 mm (4.1 in) over a span of 10 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 103 mm (4.1 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec526473861737870971031014464
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Florence

In Florence in September humidity is 66%. With an average temperature of 26°C (80°F), this humidity feels like a warm, sticky embrace, making travel a bit challenging as you might find yourself needing frequent breaks to cool down and stay hydrated.

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 66%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%78%77%78%82%78%69%63%66%73%84%87%
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 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 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 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec579111112121111864
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.
 TemperaturePrecipitationHumidityUV
January Weather10°C (51°F)52 mm (2.0 inches)78%moderate
February Weather11°C (52°F)64 mm (2.5 inches)78%high
March Weather17°C (63°F)73 mm (2.9 inches)77%very high
April Weather20°C (68°F)86 mm (3.4 inches)78%extreme
May Weather24°C (76°F)172 mm (6.8 inches)82%extreme
June Weather28°C (82°F)78 mm (3.1 inches)78%extreme
July Weather30°C (85°F)70 mm (2.8 inches)69%extreme
August Weather30°C (86°F)97 mm (3.8 inches)63%extreme
September Weather26°C (80°F)103 mm (4.1 inches)66%extreme
October Weather21°C (70°F)101 mm (4.0 inches)73%very high
November Weather15°C (59°F)44 mm (1.7 inches)84%high
December Weather12°C (54°F)64 mm (2.5 inches)87%moderate

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