September Weather in Roma, United States

Last updated: June 24, 2025

In September, the average temperature in Roma, United States reaches a warm 29°C (84°F). However, be prepared for a temperature range where it can dip to a minimum of 18°C (64°F) and soar up to a maximum of 41°C (106°F). Expect 110 mm (4.3 in) of precipitation spread over 9 days, with an average humidity level of 73%, making for a muggy yet vibrant atmosphere.

September Temperature in Roma

In September in Roma, the average temperature is 29°C (84°F). The maximum can reach 41°C (106°F), while the minimum can drop as low as 18°C (64°F). Travelers should prepare for warm and potentially hot conditions, with cooler evenings for a more comfortable experience.

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

The chart illustrates September temperature patterns in Roma, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Roma, September typically has an average temperature of 29°C (84°F), with highs reaching up to 41°C (106°F) and lows dropping to around 18°C (64°F).

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

September Precipitation in Roma

In Roma in September, the precipitation amount is 110 mm (4.3 in) over the course of 9 days.

September Precipitation Trends in Roma

The chart displays monthly precipitation patterns in Roma, 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 Roma, September typically receives around 110 mm (4.3 inches) of precipitation spread over approximately 9 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 Roma

In Roma in September, humidity is 73%. With an average temperature of 29°C (84°F), this humidity feels like a warm blanket wrapped around you, making travel slightly uncomfortable as you sweat and seek shade, yet still inviting you to explore the vibrant local culture and activities.

September Average Humidity in Roma

This chart illustrates the average monthly humidity levels in Roma, 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 Roma is approximately 73%, 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 Roma

In Roma 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 Roma.

Maximum UV Index Levels in Roma for September

The chart shows the monthly maximum UV Index (UVI) for Roma 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 Roma typically reaches 11, which falls under the extreme exposure category.

Data source: Roma 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 Roma Compares to Other Months

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

This table compares monthly weather conditions in Roma, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	16°C (61°F)	16 mm (0.6 inches)	83%	high
February Weather	18°C (65°F)	23 mm (0.9 inches)	79%	very high
March Weather	23°C (73°F)	32 mm (1.2 inches)	76%	very high
April Weather	26°C (78°F)	37 mm (1.4 inches)	77%	extreme
May Weather	29°C (84°F)	67 mm (2.6 inches)	80%	extreme
June Weather	30°C (87°F)	66 mm (2.6 inches)	73%	extreme
July Weather	31°C (88°F)	69 mm (2.7 inches)	66%	extreme
August Weather	32°C (89°F)	13 mm (0.5 inches)	65%	extreme
September Weather	29°C (84°F)	110 mm (4.3 inches)	73%	extreme
October Weather	25°C (78°F)	38 mm (1.5 inches)	76%	very high
November Weather	20°C (69°F)	36 mm (1.4 inches)	80%	high
December Weather	17°C (64°F)	20 mm (0.8 inches)	86%	high