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September Weather in Milan, United States

Last updated: June 24, 2025

In Milan, United States, the average temperature in September hovers around 18°C (64°F), with the potential for fluctuations from a chilly 1°C (34°F) to a warm 32°C (90°F). Expect a precipitation rate of 33 mm (1.3 in) spread across 4 days, while average humidity lingers at a comfortable 62%. Embrace the variety that September brings!

September Temperature in Milan

In September in Milan, the average temperature is 18°C (64°F). Maximum temperatures can reach up to 32°C (90°F), while minimum temperatures can drop as low as 1°C (34°F). Be prepared for a wide range of weather conditions if you plan to travel during this time.

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 18°C (64°F), with highs reaching up to 32°C (90°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec283341505970716964514131
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 33 mm (1.3 in) over a span of 4 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 33 mm (1.3 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec242530191911713233261420
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 62%. With an average temperature of 18°C (64°F), this humidity feels like a warm yet refreshing embrace, making it quite pleasant for traveling as long as you stay hydrated and take breaks in the shade.

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 62%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%83%71%61%48%36%37%46%62%74%82%82%
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 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 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 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec579111213131211864
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-2°C (29°F)24 mm (1.0 inches)81%moderate
February Weather0°C (33°F)25 mm (1.0 inches)83%high
March Weather5°C (42°F)30 mm (1.2 inches)71%very high
April Weather10°C (50°F)19 mm (0.8 inches)61%extreme
May Weather15°C (59°F)19 mm (0.7 inches)48%extreme
June Weather21°C (70°F)11 mm (0.4 inches)36%extreme
July Weather22°C (71°F)71 mm (2.8 inches)37%extreme
August Weather21°C (70°F)32 mm (1.3 inches)46%extreme
September Weather18°C (64°F)33 mm (1.3 inches)62%extreme
October Weather11°C (51°F)26 mm (1.0 inches)74%very high
November Weather5°C (41°F)14 mm (0.5 inches)82%high
December Weather-1°C (31°F)20 mm (0.8 inches)82%moderate

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