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September Weather in South Milwaukee, United States

Last updated: June 24, 2025

In South Milwaukee, United States, the average temperature in September hovers around 18°C (66°F). Expect delightful days with a maximum of 26°C (78°F), while cooler nights can drop to a minimum of 10°C (51°F). Prepare for some rain, as 95 mm (3.7 in) of precipitation can fall over 9 days, contributing to an average humidity level of 79%.

September Temperature in South Milwaukee

In September in South Milwaukee, the average temperature is 18°C (66°F), with maximums soaring to 26°C (78°F) and minimums dipping as low as 10°C (51°F). This pleasant climate makes South Milwaukee an ideal destination for travelers looking to enjoy mild weather and outdoor activities.

September Weather in South Milwaukee: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in South Milwaukee, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South Milwaukee, September typically has an average temperature of 18°C (66°F), with highs reaching up to 26°C (78°F) and lows dropping to around 10°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec272734394657687065544034
Data source: Temperature data for South Milwaukee 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 South Milwaukee

In South Milwaukee in September, the precipitation amount is 95 mm (3.7 in) over the course of 9 days.

September Precipitation Trends in South Milwaukee

The chart displays monthly precipitation patterns in South Milwaukee, 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 South Milwaukee, September typically receives around 95 mm (3.7 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec727176112145876160951396763
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in South Milwaukee

In South Milwaukee in September, humidity is 79%. With an average temperature of 18°C (66°F), this humidity feels like a warm, enveloping blanket, making outdoor activities slightly uncomfortable and sticky, but also offering a vibrant atmosphere perfect for exploring local cafes and shaded parks.

September Average Humidity in South Milwaukee

This chart illustrates the average monthly humidity levels in South Milwaukee, 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 South Milwaukee is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%85%85%78%80%78%76%79%83%88%82%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in South Milwaukee

In South Milwaukee in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in South Milwaukee.

Maximum UV Index Levels in South Milwaukee for September

The chart shows the monthly maximum UV Index (UVI) for South Milwaukee 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 South Milwaukee typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24589101097532
Data source: South Milwaukee 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 South Milwaukee Compares to Other Months

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

This table compares monthly weather conditions in South Milwaukee, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)72 mm (2.8 inches)85%low
February Weather-3°C (28°F)71 mm (2.8 inches)85%moderate
March Weather1°C (34°F)76 mm (3.0 inches)85%moderate
April Weather4°C (39°F)112 mm (4.4 inches)85%very high
May Weather8°C (46°F)145 mm (5.7 inches)78%very high
June Weather14°C (58°F)87 mm (3.4 inches)80%very high
July Weather20°C (68°F)61 mm (2.4 inches)78%very high
August Weather21°C (70°F)60 mm (2.4 inches)76%very high
September Weather18°C (66°F)95 mm (3.7 inches)79%high
October Weather12°C (54°F)139 mm (5.5 inches)83%moderate
November Weather4°C (40°F)67 mm (2.6 inches)88%moderate
December Weather1°C (34°F)63 mm (2.5 inches)81%low

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