Station information
- Integrated Surface Dataset (ISD) station ID: 997338
- Country: US
- State: IL
- Latitude: 42.0
- Longitude: -87.5
High Temperatures
On August 18 in CHICAGO the average high temperature is 77.5 °F (25.3 °C). The lowest recored high temperature was 69.6 °F (20.9 °C) in 2012 and the highest recored high temperature was 84.4 °F (29.1 °C) in 2016. The high temperature is usually* between 74.6 °F (23.7 °C) and 80.4 °F (26.9 °C). About a quarter of the time, the high temperature is less than 74.6 °F (23.7 °C), and another quarter of the time, the high temperature is greater than and 80.4 °F (26.9 °C). About 95% of the time, the high temperature has been between 69.1 °F (20.6 °C) and 85.9 °F (30.0 °C).
Low Temperatures
On August 18 in CHICAGO the average low temperature is 69.4 °F (20.8 °C). The lowest recored low temperature was 63.3 °F (17.4 °C) in 2014 and the lowest recored low temperature was 74.3 °F (23.5 °C) in 2021. The low temperature is usually* between 67.2 °F (19.6 °C) and 71.5 °F (22.0 °C). About a quarter of the time, the low temperature is less than 67.2 °F (19.6 °C), and another quarter of the time, the low temperature is greater than and 71.5 °F (22.0 °C). About 95% of the time, the low temperature has been between 63.1 °F (17.3 °C) and 75.7 °F (24.3 °C).
Frost
On August 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 2024