- Country: US
- State: IL
- Latitude: 42.0
- Longitude: -87.5
High Temperatures
On July 18 in CHICAGO the average high temperature is 80.8 °F (27.1 °C). The lowest recored high temperature was 64.6 °F (18.1 °C) in 2009 and the highest recored high temperature was 93.9 °F (34.4 °C) in 2012. The high temperature is usually* between 75.6 °F (24.2 °C) and 86.0 °F (30.0 °C). About a quarter of the time, the high temperature is less than 75.6 °F (24.2 °C), and another quarter of the time, the high temperature is greater than and 86.0 °F (30.0 °C). About 95% of the time, the high temperature has been between 65.6 °F (18.7 °C) and 95.9 °F (35.5 °C).
Low Temperatures
On July 18 in CHICAGO the average low temperature is 71.2 °F (21.8 °C). The lowest recored low temperature was 58.5 °F (14.7 °C) in 2009 and the lowest recored low temperature was 81.5 °F (27.5 °C) in 2013. The low temperature is usually* between 67.6 °F (19.8 °C) and 74.7 °F (23.7 °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 74.7 °F (23.7 °C). About 95% of the time, the low temperature has been between 60.9 °F (16.0 °C) and 81.5 °F (27.5 °C).
Frost
On July 18 in CHICAGO expect the temperatures to drop below freezing for a risk of frost about 0.0% of the time.
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