September 18 - CHICAGO - Weather History and Averages

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

High Temperatures

On September 18 in CHICAGO the average high temperature is 72.8 °F (22.7 °C). The lowest recored high temperature was 62.6 °F (17.0 °C) in 2014 and the highest recored high temperature was 85.5 °F (29.7 °C) in 2021. The high temperature is usually^* between 67.8 °F (19.9 °C) and 77.7 °F (25.4 °C). About a quarter of the time, the high temperature is less than 67.8 °F (19.9 °C), and another quarter of the time, the high temperature is greater than and 77.7 °F (25.4 °C). About 95% of the time, the high temperature has been between 58.4 °F (14.7 °C) and 87.1 °F (30.6 °C).

Low Temperatures

On September 18 in CHICAGO the average low temperature is 63.7 °F (17.6 °C). The lowest recored low temperature was 49.8 °F (9.9 °C) in 2012 and the lowest recored low temperature was 71.1 °F (21.7 °C) in 2022. The low temperature is usually^* between 60.1 °F (15.6 °C) and 67.3 °F (19.6 °C). About a quarter of the time, the low temperature is less than 60.1 °F (15.6 °C), and another quarter of the time, the low temperature is greater than and 67.3 °F (19.6 °C). About 95% of the time, the low temperature has been between 53.2 °F (11.8 °C) and 74.2 °F (23.5 °C).

Frost

On September 18 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 2007 to 2024

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