Station information
- Integrated Surface Dataset (ISD) station ID: 997338
- Country: US
- State: IL
- Latitude: 42.0
- Longitude: -87.5
High Temperatures
On September 17 in CHICAGO the average high temperature is 72.7 °F (22.6 °C). The lowest recored high temperature was 62.1 °F (16.7 °C) in 2014 and the highest recored high temperature was 86.2 °F (30.1 °C) in 2021. The high temperature is usually* between 67.7 °F (19.8 °C) and 77.7 °F (25.4 °C). About a quarter of the time, the high temperature is less than 67.7 °F (19.8 °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 58.1 °F (14.5 °C) and 87.3 °F (30.7 °C).
Low Temperatures
On September 17 in CHICAGO the average low temperature is 63.1 °F (17.3 °C). The lowest recored low temperature was 54.9 °F (12.7 °C) in 2014 and the lowest recored low temperature was 71.6 °F (22.0 °C) in 2024. The low temperature is usually* between 59.2 °F (15.1 °C) and 67.0 °F (19.5 °C). About a quarter of the time, the low temperature is less than 59.2 °F (15.1 °C), and another quarter of the time, the low temperature is greater than and 67.0 °F (19.5 °C). About 95% of the time, the low temperature has been between 51.8 °F (11.0 °C) and 74.5 °F (23.6 °C).
Frost
On September 17 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 2007 to 2024