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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 (79°F), with a minimum dipping to 10°C (50°F) and a peak reaching up to 38°C (101°F). During this month, you can expect 94 mm (3.7 in) of precipitation spread across 8 days, accompanied by an average humidity of 73%.

September Temperature in Florence

In September in Florence, the average temperature is 26°C (79°F), with maximums reaching as high as 38°C (101°F) and minimums dropping to as low as 10°C (50°F). Travelers should be prepared for warm days and cool nights during their visit.

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 (79°F), with highs reaching up to 38°C (101°F) and lows dropping to around 10°C (50°F).
JanFebMarAprMayJunJulAugSepOctNovDec485361647379828178695552
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 94 mm (3.7 in) over the course of 8 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 94 mm (3.7 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec1121541271691361431001419512177121
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 73%. With an average temperature of 26°C (79°F), this humidity feels like a warm, sticky embrace, making travel slightly uncomfortable as you navigate through the heat with a constant sheen of sweat on your skin.

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 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%83%80%82%83%80%80%75%73%76%84%88%
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.
JanFebMarAprMayJunJulAugSepOctNovDec478111112121110864
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 Weather9°C (48°F)112 mm (4.4 inches)84%moderate
February Weather12°C (53°F)154 mm (6.0 inches)83%high
March Weather16°C (61°F)127 mm (5.0 inches)80%very high
April Weather18°C (64°F)169 mm (6.7 inches)82%extreme
May Weather23°C (74°F)136 mm (5.4 inches)83%extreme
June Weather26°C (79°F)143 mm (5.6 inches)80%extreme
July Weather28°C (82°F)100 mm (3.9 inches)80%extreme
August Weather27°C (81°F)141 mm (5.5 inches)75%extreme
September Weather26°C (79°F)94 mm (3.7 inches)73%very high
October Weather20°C (69°F)121 mm (4.8 inches)76%very high
November Weather13°C (55°F)77 mm (3.0 inches)84%high
December Weather11°C (52°F)121 mm (4.8 inches)88%moderate

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