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September Weather in Rome, United States

Last updated: June 24, 2025

In Rome, United States, the average temperature in September is a pleasant 17°C (63°F). However, temperatures can swing dramatically, with a minimum of 1°C (35°F) and a maximum of 33°C (91°F). During this time, expect about 106 mm (4.2 in) of precipitation spread over 9 days, contributing to an average humidity of 78%.

September Temperature in Rome

In September in Rome, the average temperature is 17°C (63°F). Maximums can reach 33°C (91°F), while minimums can drop as low as 1°C (35°F). This varied climate makes Rome an ideal destination for travelers seeking both warm days and cool evenings.

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

The chart illustrates September temperature patterns in Rome, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rome, September typically has an average temperature of 17°C (63°F), with highs reaching up to 33°C (91°F) and lows dropping to around 1°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec191933435869736963493425
Data source: Temperature data for Rome 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 Rome

In Rome in September, the total precipitation amount is 106 mm (4.2 in), spread over the course of 9 days.

September Precipitation Trends in Rome

The chart displays monthly precipitation patterns in Rome, 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 Rome, September typically receives around 106 mm (4.2 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec385261951121081161241061065149
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Rome

In Rome in September, humidity is 78%. With an average temperature of 17°C (63°F), this humidity feels like a warm, enveloping blanket, making traveling slightly uncomfortable as you navigate the sticky air, prompting the need for frequent breaks in cooler, shaded areas.

September Average Humidity in Rome

This chart illustrates the average monthly humidity levels in Rome, 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 Rome is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%90%87%84%77%75%75%73%78%84%89%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Rome

In Rome in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Rome.

Maximum UV Index Levels in Rome for September

The chart shows the monthly maximum UV Index (UVI) for Rome 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 Rome typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24589101097532
Data source: Rome 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 Rome Compares to Other Months

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

This table compares monthly weather conditions in Rome, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (19°F)38 mm (1.5 inches)89%low
February Weather-7°C (19°F)52 mm (2.0 inches)90%moderate
March Weather1°C (33°F)61 mm (2.4 inches)87%moderate
April Weather6°C (44°F)95 mm (3.7 inches)84%very high
May Weather14°C (58°F)112 mm (4.4 inches)77%very high
June Weather20°C (69°F)108 mm (4.3 inches)75%very high
July Weather23°C (73°F)116 mm (4.6 inches)74%very high
August Weather21°C (70°F)124 mm (4.9 inches)73%very high
September Weather17°C (63°F)106 mm (4.2 inches)78%high
October Weather9°C (49°F)106 mm (4.2 inches)84%moderate
November Weather1°C (34°F)51 mm (2.0 inches)89%moderate
December Weather-4°C (26°F)49 mm (1.9 inches)87%low

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