- Latitude: 41.867
- Longitude: -87.6
High Temperatures
On August 9 in this location the average high temperature is 82.7 °F (28.2 °C). The lowest recored high temperature was 64.9 °F (18.3 °C) in 1972 and the highest recored high temperature was 99.0 °F (37.2 °C) in 1988. The high temperature is usually* between 78.9 °F (26.0 °C) and 86.6 °F (30.3 °C). About a quarter of the time, the high temperature is less than 78.9 °F (26.0 °C), and another quarter of the time, the high temperature is greater than and 86.6 °F (30.3 °C). About 95% of the time, the high temperature has been between 71.5 °F (22.0 °C) and 93.9 °F (34.4 °C).
Low Temperatures
On August 9 in this location the average low temperature is 66.1 °F (18.9 °C). The lowest recored low temperature was 45.0 °F (7.2 °C) in 1964 and the lowest recored low temperature was 81.5 °F (27.5 °C) in 2025. The low temperature is usually* between 62.6 °F (17.0 °C) and 69.6 °F (20.9 °C). About a quarter of the time, the low temperature is less than 62.6 °F (17.0 °C), and another quarter of the time, the low temperature is greater than and 69.6 °F (20.9 °C). About 95% of the time, the low temperature has been between 55.8 °F (13.2 °C) and 76.4 °F (24.7 °C).
Frost
On August 9 in this location 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 O'HARE INTERNATIONAL — Integrated Surface Dataset (ISD) station ID: 725300 — Weather Bureau Army Navy (WBAN): 94846 — from year 1947 to 2025
- CHICAGO MIDWAY INTL ARPT — Integrated Surface Dataset (ISD) station ID: 725340 — Weather Bureau Army Navy (WBAN): 14819 — from year 1973 to 2025
- 9087044 - CALUMET IL — Integrated Surface Dataset (ISD) station ID: 997255 — from year 2005 to 2025
- CHICAGO — Integrated Surface Dataset (ISD) station ID: 997338 — from year 2005 to 2025
- GARY/CHICAGO AIRPORT — Integrated Surface Dataset (ISD) station ID: 725337 — Weather Bureau Army Navy (WBAN): 04807 — from year 2006 to 2025
- NORTHERLY ISLAND — Integrated Surface Dataset (ISD) station ID: 998499 — from year 2012 to 2025
- FOSTER AVE CHICAGO — Integrated Surface Dataset (ISD) station ID: 998497 — from year 2012 to 2019
- CHICAGO/MEIGS — Integrated Surface Dataset (ISD) station ID: 725346 — from year 2000 to 2002
- CHICAGO/MEIGS — Integrated Surface Dataset (ISD) station ID: 725346 — Weather Bureau Army Navy (WBAN): 94866 — from year 1973 to 1999
- WILMETTE (MARINES)& — Integrated Surface Dataset (ISD) station ID: 725307 — from year 1976 to 1995
- CHICAGO / CALUMET COAST GUARD — Integrated Surface Dataset (ISD) station ID: 725344 — from year 1994 to 1995
- NAVAL AIR STATION — Integrated Surface Dataset (ISD) station ID: 725306 — Weather Bureau Army Navy (WBAN): 14855 — from year 1973 to 1994
- WILMETTE (CGS) — Integrated Surface Dataset (ISD) station ID: 722417 — from year 1987 to 1990
- CALUMET (CGS) — Integrated Surface Dataset (ISD) station ID: 722418 — from year 1987 to 1989
- NAVAL AIR STATION — Weather Bureau Army Navy (WBAN): 14855 — from year 1945 to 1972
- CHICAGO MIDWAY AP — Weather Bureau Army Navy (WBAN): 14819 — from year 1948 to 1972
- CHICAGO OHARE INTL AP — Weather Bureau Army Navy (WBAN): 94846 — from year 1970 to 1972
- CHICAGO MEIGS FIELD — Weather Bureau Army Navy (WBAN): 94866 — from year 1966 to 1969
- PARK RIDGE AF — Weather Bureau Army Navy (WBAN): 14810 — from year 1949 to 1958