- Country: US
- State: IL
- Latitude: 42.0
- Longitude: -87.5
High Temperatures
On September 30 in CHICAGO the average high temperature is 67.1 °F (19.5 °C). The lowest recored high temperature was 56.5 °F (13.6 °C) in 2009 and the highest recored high temperature was 85.6 °F (29.8 °C) in 2019. The high temperature is usually* between 62.2 °F (16.8 °C) and 72.0 °F (22.2 °C). About a quarter of the time, the high temperature is less than 62.2 °F (16.8 °C), and another quarter of the time, the high temperature is greater than and 72.0 °F (22.2 °C). About 95% of the time, the high temperature has been between 52.8 °F (11.5 °C) and 81.4 °F (27.4 °C).
Low Temperatures
On September 30 in CHICAGO the average low temperature is 58.1 °F (14.5 °C). The lowest recored low temperature was 51.1 °F (10.6 °C) in 2011 and the lowest recored low temperature was 68.5 °F (20.3 °C) in 2024. The low temperature is usually* between 54.2 °F (12.3 °C) and 62.0 °F (16.7 °C). About a quarter of the time, the low temperature is less than 54.2 °F (12.3 °C), and another quarter of the time, the low temperature is greater than and 62.0 °F (16.7 °C). About 95% of the time, the low temperature has been between 46.8 °F (8.2 °C) and 69.4 °F (20.8 °C).
Frost
On September 30 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