October 21 - MILWAUKEE - Weather History and Averages

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

High Temperatures

On October 21 in MILWAUKEE the average high temperature is 59.5 °F (15.3 °C). The lowest recored high temperature was 49.3 °F (9.6 °C) in 2016 and the highest recored high temperature was 79.9 °F (26.6 °C) in 2024. The high temperature is usually^* between 53.0 °F (11.6 °C) and 66.0 °F (18.9 °C). About a quarter of the time, the high temperature is less than 53.0 °F (11.6 °C), and another quarter of the time, the high temperature is greater than and 66.0 °F (18.9 °C). About 95% of the time, the high temperature has been between 40.5 °F (4.7 °C) and 78.5 °F (25.8 °C).

Low Temperatures

On October 21 in MILWAUKEE the average low temperature is 46.6 °F (8.1 °C). The lowest recored low temperature was 38.1 °F (3.4 °C) in 2008 and the lowest recored low temperature was 58.5 °F (14.7 °C) in 2024. The low temperature is usually^* between 42.2 °F (5.7 °C) and 51.1 °F (10.6 °C). About a quarter of the time, the low temperature is less than 42.2 °F (5.7 °C), and another quarter of the time, the low temperature is greater than and 51.1 °F (10.6 °C). About 95% of the time, the low temperature has been between 33.8 °F (1.0 °C) and 59.5 °F (15.3 °C).

Frost

On October 21 in MILWAUKEE expect the temperatures to drop below freezing for a risk of frost about 1.3% 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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