September Weather in Milan, United States

Last updated: June 24, 2025

In September, the average temperature in Milan, United States is a pleasant 20°C (69°F), with a minimum of 5°C (41°F) and a maximum reaching up to 34°C (93°F). Prepare for 107 mm (4.2 in) of precipitation over 10 days, contributing to an average humidity of around 78%. Enjoy the diverse climate while exploring all that this destination has to offer!

September Temperature in Milan

In September in Milan, the average temperature is 20°C (69°F). Maximums can reach 34°C (93°F), and minimums can be as low as 5°C (41°F). This makes it a great time to visit, as you can enjoy warm days while still experiencing cooler evenings.

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

The chart illustrates September temperature patterns in Milan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Milan, September typically has an average temperature of 20°C (69°F), with highs reaching up to 34°C (93°F) and lows dropping to around 5°C (41°F).

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

September Precipitation in Milan

In Milan in September, the precipitation amount is 107 mm (4.2 in) accumulated over a period of 10 days.

September Precipitation Trends in Milan

The chart displays monthly precipitation patterns in Milan, 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 Milan, September typically receives around 107 mm (4.2 inches) of precipitation spread over approximately 10 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 Milan

In Milan in September, humidity is 78%. With an average temperature of 20°C (69°F), this humidity feels like a warm, enveloping blanket, making travel somewhat uncomfortable as sweat clings to your skin and the air feels thick and heavy, urging you to seek out shaded areas and refreshing drinks.

September Average Humidity in Milan

This chart illustrates the average monthly humidity levels in Milan, 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 Milan is approximately 78%, 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 Milan

In Milan 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 Milan.

Maximum UV Index Levels in Milan for September

The chart shows the monthly maximum UV Index (UVI) for Milan 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 Milan typically reaches 8, which falls under the very high exposure category.

Data source: Milan 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 Milan Compares to Other Months

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

This table compares monthly weather conditions in Milan, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-5°C (24°F)	54 mm (2.1 inches)	81%	moderate
February Weather	-3°C (27°F)	60 mm (2.3 inches)	81%	moderate
March Weather	4°C (40°F)	91 mm (3.6 inches)	81%	high
April Weather	10°C (50°F)	105 mm (4.1 inches)	82%	very high
May Weather	17°C (63°F)	147 mm (5.8 inches)	78%	very high
June Weather	23°C (74°F)	131 mm (5.2 inches)	81%	extreme
July Weather	25°C (77°F)	83 mm (3.3 inches)	79%	very high
August Weather	23°C (74°F)	75 mm (2.9 inches)	77%	very high
September Weather	20°C (69°F)	107 mm (4.2 inches)	78%	very high
October Weather	12°C (54°F)	121 mm (4.8 inches)	78%	high
November Weather	4°C (39°F)	50 mm (2.0 inches)	87%	moderate
December Weather	0°C (32°F)	48 mm (1.9 inches)	84%	low