- Country: US
- State: IL
- Latitude: 42.0
- Longitude: -87.5
High Temperatures
On September 12 in CHICAGO the average high temperature is 74.1 °F (23.4 °C). The lowest recored high temperature was 56.3 °F (13.5 °C) in 2014 and the highest recored high temperature was 86.2 °F (30.1 °C) in 2005. The high temperature is usually* between 68.7 °F (20.4 °C) and 79.5 °F (26.4 °C). About a quarter of the time, the high temperature is less than 68.7 °F (20.4 °C), and another quarter of the time, the high temperature is greater than and 79.5 °F (26.4 °C). About 95% of the time, the high temperature has been between 58.4 °F (14.7 °C) and 89.7 °F (32.1 °C).
Low Temperatures
On September 12 in CHICAGO the average low temperature is 63.6 °F (17.6 °C). The lowest recored low temperature was 48.9 °F (9.4 °C) in 2014 and the lowest recored low temperature was 74.1 °F (23.4 °C) in 2021. The low temperature is usually* between 58.9 °F (14.9 °C) and 68.4 °F (20.2 °C). About a quarter of the time, the low temperature is less than 58.9 °F (14.9 °C), and another quarter of the time, the low temperature is greater than and 68.4 °F (20.2 °C). About 95% of the time, the low temperature has been between 49.8 °F (9.9 °C) and 77.4 °F (25.2 °C).
Frost
On September 12 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