September - MILWAUKEE - Weather History and Averages

High Temperatures

On average, the day in September with the warmest high temperature in MILWAUKEE is September 2 at an average of 76.1 °F (24.5 °C).

On average, the day in September with the coldest high temperature in MILWAUKEE is September 30 at an average of 63.8 °F (17.7 °C).

The warmest recorded high temperature in September in MILWAUKEE was 92.1 °F (33.4 °C) on September 3 in the year 2023 at MILWAUKEE — Integrated Surface Dataset (ISD) station ID: 997342 .

The coldest recorded high temperature in September in MILWAUKEE was 50.5 °F (10.3 °C) on September 12 in the year 2014 at MILWAUKEE — Integrated Surface Dataset (ISD) station ID: 997342 .

On average, the day in September with the warmest low temperature in MILWAUKEE is September 2 at an average of 64.7 °F (18.1 °C).

On average, the day in September with the coldest low temperature in MILWAUKEE is September 30 at an average of 53.7 °F (12.1 °C).

The warmest recorded low temperature in MILWAUKEE was 76.8 °F (24.9 °C) on September 5 in the year 2023 at MILWAUKEE — Integrated Surface Dataset (ISD) station ID: 997342 .

The coldest recorded low temperature in MILWAUKEE was 41.5 °F (5.3 °C) on September 30 in the year 2009 at MILWAUKEE — Integrated Surface Dataset (ISD) station ID: 997342 .

If you would like to see the temperatures for specific days, you can click on the corresponding links below: