September 20 - MILWAUKEE - Weather History and Averages

Station: MILWAUKEE (2006 to 2025)
Country: US
State: WI
Latitude: 43.05
Longitude: -87.88

High Temperatures

On September 20 in MILWAUKEE the average high temperature is 70.9 °F (21.6 °C). The lowest recored high temperature was 58.8 °F (14.9 °C) in 2010 and the highest recored high temperature was 82.0 °F (27.8 °C) in 2024. The high temperature is usually^* between 66.5 °F (19.2 °C) and 75.3 °F (24.1 °C). About a quarter of the time, the high temperature is less than 66.5 °F (19.2 °C), and another quarter of the time, the high temperature is greater than and 75.3 °F (24.1 °C). About 95% of the time, the high temperature has been between 58.1 °F (14.5 °C) and 83.7 °F (28.7 °C).

Low Temperatures

On September 20 in MILWAUKEE the average low temperature is 59.7 °F (15.4 °C). The lowest recored low temperature was 48.4 °F (9.1 °C) in 2020 and the lowest recored low temperature was 69.8 °F (21.0 °C) in 2021. The low temperature is usually^* between 55.8 °F (13.2 °C) and 63.6 °F (17.6 °C). About a quarter of the time, the low temperature is less than 55.8 °F (13.2 °C), and another quarter of the time, the low temperature is greater than and 63.6 °F (17.6 °C). About 95% of the time, the low temperature has been between 48.4 °F (9.1 °C) and 71.0 °F (21.7 °C).

Frost

On September 20 in MILWAUKEE expect the temperatures to drop below freezing for a risk of frost about 0.0% of the time.

^{Usually* in this context means around 50% of the
time, assuming a normal distribution of values.}

Data Source(s)

The data used to compute the average high/low temperatures for this location were taken from the following stations:

MILWAUKEE — Integrated Surface Dataset (ISD) station ID: 997342 — from year 2006 to 2024

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