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September Weather in Rome, United States

Last updated: June 24, 2025

In Rome, United States, the average temperature in September hovers around 17°C (62°F). Expect a range of temperatures, with minimums dropping to -1°C (31°F) and maximums soaring to 32°C (91°F). This month brings 96 mm (3.8 in) of precipitation over approximately 10 days, and the average humidity sits at a comfortable 78%.

September Temperature in Rome

In September in Rome, the average temperature is 17°C (62°F), with maximums reaching 32°C (91°F) and minimums dropping as low as -1°C (31°F). Be prepared for a wide range of temperatures, making it ideal to pack layers for your travels.

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 (62°F), with highs reaching up to 32°C (91°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec232633455766716962523729
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 96 mm (3.8 in) over a span of 10 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 96 mm (3.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec10911910713814012417512896188132131
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 (62°F), this humidity feels like a warm, enveloping blanket, making travel feel a bit sticky and heavy but also refreshing, as long as you're prepared with light clothing and plenty of water.

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.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%87%88%82%79%78%76%78%84%89%86%
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 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3468910998632
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-5°C (23°F)109 mm (4.3 inches)90%moderate
February Weather-3°C (26°F)119 mm (4.7 inches)90%moderate
March Weather0°C (33°F)107 mm (4.2 inches)87%high
April Weather7°C (45°F)138 mm (5.4 inches)88%very high
May Weather14°C (58°F)140 mm (5.5 inches)82%very high
June Weather19°C (66°F)124 mm (4.9 inches)79%very high
July Weather22°C (71°F)175 mm (6.9 inches)78%very high
August Weather21°C (69°F)128 mm (5.0 inches)76%very high
September Weather17°C (62°F)96 mm (3.8 inches)78%very high
October Weather11°C (52°F)188 mm (7.4 inches)84%high
November Weather3°C (37°F)132 mm (5.2 inches)89%moderate
December Weather-2°C (29°F)131 mm (5.1 inches)86%low

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