September Weather in Rome, United States

Last updated: June 24, 2025

In September, the average temperature in Rome, United States hovers around 21°C (69°F). Expect a minimum dip to 5°C (42°F) and a potential maximum rise to 35°C (95°F). With an average humidity of 80%, the atmosphere can feel quite muggy. Be prepared for 79 mm (3.1 in) of precipitation spread over 8 days during the month.

September Temperature in Rome

In September in Rome, the average temperature is 21°C (69°F). Maximum temperatures can reach 35°C (95°F), while minimum temperatures can drop as low as 5°C (42°F). This diverse temperature range makes Rome an ideal destination for travelers seeking both warmth during the day and cooler 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 21°C (69°F), with highs reaching up to 35°C (95°F) and lows dropping to around 5°C (42°F).

Data source: Temperature data for Rome generated using information from the Copernicus Climate Change Service.

September Precipitation in Rome

In Rome in September, the precipitation amount is 79 mm (3.1 in) during 8 days, indicating a relatively wet period for the area.

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 79 mm (3.1 inches) of precipitation spread over approximately 8 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 Rome

In Rome in September, humidity is 80%. With an average temperature of 21°C (69°F), this humidity feels like a warm, sticky embrace, making outdoor activities a bit challenging for travelers as the air becomes heavy and can lead to fatigue while sightseeing.

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 80%, 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 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.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	-3°C (26°F)	58 mm (2.3 inches)	82%	moderate
February Weather	-2°C (28°F)	65 mm (2.6 inches)	83%	moderate
March Weather	5°C (41°F)	100 mm (3.9 inches)	84%	high
April Weather	10°C (50°F)	114 mm (4.5 inches)	85%	very high
May Weather	17°C (63°F)	162 mm (6.4 inches)	79%	very high
June Weather	23°C (74°F)	158 mm (6.2 inches)	82%	extreme
July Weather	25°C (77°F)	104 mm (4.1 inches)	80%	very high
August Weather	23°C (74°F)	70 mm (2.8 inches)	81%	very high
September Weather	21°C (69°F)	79 mm (3.1 inches)	80%	very high
October Weather	13°C (56°F)	135 mm (5.3 inches)	82%	high
November Weather	4°C (40°F)	55 mm (2.2 inches)	88%	moderate
December Weather	1°C (34°F)	52 mm (2.1 inches)	84%	low