July 30 - CHICAGO - Weather History and Averages

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

High Temperatures

On July 30 in CHICAGO the average high temperature is 78.2 °F (25.7 °C). The lowest recored high temperature was 69.8 °F (21.0 °C) in 2013 and the highest recored high temperature was 86.7 °F (30.4 °C) in 2025. The high temperature is usually^* between 74.4 °F (23.6 °C) and 81.9 °F (27.7 °C). About a quarter of the time, the high temperature is less than 74.4 °F (23.6 °C), and another quarter of the time, the high temperature is greater than and 81.9 °F (27.7 °C). About 95% of the time, the high temperature has been between 67.2 °F (19.6 °C) and 89.1 °F (31.7 °C).

Low Temperatures

On July 30 in CHICAGO the average low temperature is 70.4 °F (21.3 °C). The lowest recored low temperature was 62.6 °F (17.0 °C) in 2014 and the lowest recored low temperature was 77.9 °F (25.5 °C) in 2025. The low temperature is usually^* between 67.6 °F (19.8 °C) and 73.2 °F (22.9 °C). About a quarter of the time, the low temperature is less than 67.6 °F (19.8 °C), and another quarter of the time, the low temperature is greater than and 73.2 °F (22.9 °C). About 95% of the time, the low temperature has been between 62.3 °F (16.8 °C) and 78.6 °F (25.9 °C).

Frost

On July 30 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 2025

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