Cook County, IL
: September 2026 so far averaged 68.6°F in Cook County, IL, the warmest 1 to 29 September in the county average since 2024, 8th warmest of 76 (county average from NOAA gridded data, 1951 to 2026).
Last updated . This page normally updates every day; the latest update is late.
- Tuesday 29 September 2026: a high of 73.3°F averaged over Cook County, IL, the warmest 29 September in the county average since 2025, tied 24th warmest of 76 (with 1989) (county average from NOAA gridded data, 1951 to 2026).
- Tuesday 29 September 2026: a low of 48°F averaged over Cook County, IL, the coldest 29 September night in the county average since 2022, 35th coldest of 76 (county average from NOAA gridded data, 1951 to 2026).
- No measurable precipitation in the county average of Cook County, IL for 7 days to Tuesday 29 September 2026 (county average from NOAA gridded data, 1951 to 2026).
The month
- August 2026 averaged 72.6°F in Cook County, IL, the warmest August in the county average since 2024, tied 44th warmest of 132 (with 2014, 1960, 1935 and 2 other years) (county average from NOAA's monthly county data, 1895 to 2026).
- Days of the month without a value
- 0
Every year on this date
- Above the normal range
- In it
- Below it
- Normal range
- This year and the extreme
Every year as a table
| Year | High, °F | Low, °F |
|---|---|---|
| 2026 | 73.3 | 48 |
| 2025 | 80.9 | 58.1 |
| 2024 | 73.1 | 65.7 |
| 2023 | 70.8 | 55.5 |
| 2022 | 60.9 | 39.6 |
| 2021 | 75.4 | 53.6 |
| 2020 | 62.9 | 44 |
| 2019 | 65.1 | 59.1 |
| 2018 | 62.5 | 39.6 |
| 2017 | 72.3 | 50.9 |
| 2016 | 61.1 | 51.7 |
| 2015 | 77.9 | 61.9 |
| 2014 | 78.2 | 52.8 |
| 2013 | 83.3 | 51.7 |
| 2012 | 67.4 | 44.9 |
| 2011 | 63.5 | 49.3 |
| 2010 | 69.7 | 47.5 |
| 2009 | 62.6 | 48.3 |
| 2008 | 71 | 54.3 |
| 2007 | 73.5 | 49.3 |
| 2006 | 58.9 | 38.4 |
| 2005 | 73.9 | 43.5 |
| 2004 | 65.5 | 47.4 |
| 2003 | 56.1 | 39.9 |
| 2002 | 75.2 | 53.2 |
| 2001 | 56.2 | 45.4 |
| 2000 | 64.9 | 44.8 |
| 1999 | 67.3 | 52.6 |
| 1998 | 76.6 | 54.7 |
| 1997 | 70.9 | 53.2 |
| 1996 | 62.2 | 47 |
| 1995 | 81.6 | 52.5 |
| 1994 | 64.5 | 44.1 |
| 1993 | 58.4 | 39.9 |
| 1992 | 61.8 | 37 |
| 1991 | 63.8 | 39.7 |
| 1990 | 67.6 | 54.3 |
| 1989 | 73.3 | 45.3 |
| 1988 | 73.4 | 57.2 |
| 1987 | 77.3 | 56.7 |
| 1986 | 82 | 67 |
| 1985 | 75.3 | 48.1 |
| 1984 | 57.1 | 35 |
| 1983 | 80.4 | 52.4 |
| 1982 | 74.5 | 52 |
| 1981 | 63.8 | 42.2 |
| 1980 | 67.1 | 48.7 |
| 1979 | 82.5 | 53.9 |
| 1978 | 64.7 | 42.4 |
| 1977 | 68.8 | 48.3 |
| 1976 | 64.9 | 44.5 |
| 1975 | 71.1 | 46.2 |
| 1974 | 67 | 47.5 |
| 1973 | 70.7 | 61.8 |
| 1972 | 72.8 | 48.6 |
| 1971 | 85.9 | 64.2 |
| 1970 | 61.6 | 37.3 |
| 1969 | 67 | 43.8 |
| 1968 | 69.9 | 46.8 |
| 1967 | 49.9 | 40.4 |
| 1966 | 64.8 | 51.4 |
| 1965 | 75 | 53.4 |
| 1964 | 63.2 | 36.3 |
| 1963 | 68.3 | 47.2 |
| 1962 | 64.7 | 39.9 |
| 1961 | 60.7 | 34.3 |
| 1960 | 68.3 | 49.2 |
| 1959 | 70 | 54.2 |
| 1958 | 67 | 43.1 |
| 1957 | 66.3 | 36.8 |
| 1956 | 78.1 | 51.4 |
| 1955 | 69.5 | 51.2 |
| 1954 | 77.3 | 61.6 |
| 1953 | 91.5 | 52.7 |
| 1952 | 80.6 | 53.5 |
| 1951 | 57.3 | 34.2 |
Nearby
Chicago, IL 15.4 mi, the nearest city with its own station