September 27 - CHICAGO - Weather History and Averages

Station: CHICAGO (2005 to 2025)
Country: US
State: IL
Latitude: 42.0
Longitude: -87.5

High Temperatures

On September 27 in CHICAGO the average high temperature is 69.1 °F (20.6 °C). The lowest recored high temperature was 57.7 °F (14.3 °C) in 2010 and the highest recored high temperature was 88.0 °F (31.1 °C) in 2017. The high temperature is usually^* between 64.5 °F (18.1 °C) and 73.7 °F (23.2 °C). About a quarter of the time, the high temperature is less than 64.5 °F (18.1 °C), and another quarter of the time, the high temperature is greater than and 73.7 °F (23.2 °C). About 95% of the time, the high temperature has been between 55.8 °F (13.2 °C) and 82.5 °F (28.0 °C).

Low Temperatures

On September 27 in CHICAGO the average low temperature is 60.6 °F (15.9 °C). The lowest recored low temperature was 50.7 °F (10.4 °C) in 2022 and the lowest recored low temperature was 69.6 °F (20.9 °C) in 2021. The low temperature is usually^* between 57.0 °F (13.9 °C) and 64.2 °F (17.9 °C). About a quarter of the time, the low temperature is less than 57.0 °F (13.9 °C), and another quarter of the time, the low temperature is greater than and 64.2 °F (17.9 °C). About 95% of the time, the low temperature has been between 50.1 °F (10.0 °C) and 71.1 °F (21.7 °C).

Frost

On September 27 in CHICAGO 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:

CHICAGO — Integrated Surface Dataset (ISD) station ID: 997338 — from year 2005 to 2024

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