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September Weather in Milan, United States

Last updated: June 24, 2025

In September, the average temperature in Milan, United States is a pleasant 21°C (70°F), with temperatures ranging from a cool 6°C (43°F) to a warm 33°C (92°F). During this month, expect about 108 mm (4.3 in) of precipitation over 8 days, and enjoy an average humidity of 73%, creating a refreshing yet comfortable atmosphere.

September Temperature in Milan

In September in Milan, the average temperature is 21°C (70°F), with maximums reaching up to 33°C (92°F) and minimums dropping as low as 6°C (43°F). This weather makes Milan an ideal destination for travelers seeking pleasant temperatures and a variety of outdoor activities.

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 21°C (70°F), with highs reaching up to 33°C (92°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec272943516476797570554134
Data source: Temperature data for Milan 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 Milan

In Milan in September, the precipitation amount is 108 mm (4.3 in) spread over 8 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 108 mm (4.3 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec534810584169124105941091335235
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Milan

In Milan in September, humidity is 73%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace that can make outdoor activities feel sweltering, so it's essential to stay hydrated and take breaks in the shade while exploring.

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 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%80%77%78%77%81%81%77%73%75%85%83%
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.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111108643
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.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)53 mm (2.1 inches)78%moderate
February Weather-2°C (29°F)48 mm (1.9 inches)80%moderate
March Weather6°C (43°F)105 mm (4.1 inches)77%high
April Weather11°C (52°F)84 mm (3.3 inches)77%very high
May Weather18°C (64°F)169 mm (6.6 inches)77%very high
June Weather24°C (76°F)124 mm (4.9 inches)81%extreme
July Weather26°C (79°F)105 mm (4.1 inches)81%extreme
August Weather24°C (75°F)94 mm (3.7 inches)77%very high
September Weather21°C (70°F)108 mm (4.3 inches)73%very high
October Weather13°C (55°F)133 mm (5.2 inches)75%high
November Weather5°C (41°F)52 mm (2.1 inches)85%moderate
December Weather1°C (35°F)35 mm (1.4 inches)83%moderate

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