Lee County, IL
: September 2026 so far averaged 68.6°F in Lee County, IL, the warmest 1 to 29 September in the county average since 2016, 5th 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.
- High
- 76.1°F
- Warmest since 2025
- 21st warmest of 76
- Low
- 47.8°F
- Warmest since 2025
- 32nd warmest of 76
No measurable precipitation in the county average of Lee County, IL for 6 days to Tuesday 29 September 2026 (county average from NOAA gridded data, 1951 to 2026).
- Normal range, 59.3 to 80.1°F
Every year as a table
Every 29 September low of the county average in Lee County, IL since 1951: 47.8°F in 2026; the lowest is 30.3°F, in 1984.
| Year | High, °F | Low, °F |
|---|---|---|
| 2026 | 76.1 | 47.8 |
| 2025 | 87.6 | 55.4 |
| 2024 | 78.2 | 59.1 |
| 2023 | 73 | 54.4 |
| 2022 | 61.4 | 36.9 |
| 2021 | 82.8 | 53.5 |
| 2020 | 63.2 | 42.6 |
| 2019 | 64.5 | 55 |
| 2018 | 59.5 | 37.2 |
| 2017 | 73.1 | 44.3 |
| 2016 | 63.6 | 49.4 |
| 2015 | 79.8 | 61 |
| 2014 | 82.4 | 52.9 |
| 2013 | 82.9 | 48.7 |
| 2012 | 71.7 | 40.1 |
| 2011 | 69.7 | 45.5 |
| 2010 | 74.7 | 46 |
| 2009 | 62.3 | 45.2 |
| 2008 | 71.3 | 52.9 |
| 2007 | 77.7 | 46.9 |
| 2006 | 58.8 | 40.4 |
| 2005 | 69.4 | 39.2 |
| 2004 | 68.5 | 40.4 |
| 2003 | 56.4 | 34.7 |
| 2002 | 81.4 | 54.1 |
| 2001 | 59.9 | 43.3 |
| 2000 | 71.4 | 44.5 |
| 1999 | 57.3 | 46.4 |
| 1998 | 78.9 | 52.7 |
| 1997 | 72.6 | 50.5 |
| 1996 | 63.6 | 45.8 |
| 1995 | 80 | 50.7 |
| 1994 | 66.3 | 41.9 |
| 1993 | 59.4 | 37.4 |
| 1992 | 59.3 | 33.3 |
| 1991 | 67.9 | 39 |
| 1990 | 68 | 47.6 |
| 1989 | 73.6 | 41.5 |
| 1988 | 74.4 | 55.7 |
| 1987 | 77 | 52.4 |
| 1986 | 81.7 | 65 |
| 1985 | 75.2 | 47 |
| 1984 | 55.4 | 30.3 |
| 1983 | 80.9 | 54.3 |
| 1982 | 77.9 | 52.1 |
| 1981 | 64.3 | 40.1 |
| 1980 | 64 | 46.2 |
| 1979 | 81.6 | 52.1 |
| 1978 | 68.9 | 42.3 |
| 1977 | 72.2 | 47.2 |
| 1976 | 64.8 | 44.8 |
| 1975 | 69.5 | 46 |
| 1974 | 67.6 | 44.4 |
| 1973 | 72.2 | 61.3 |
| 1972 | 72.5 | 42.7 |
| 1971 | 84.9 | 60.2 |
| 1970 | 68.6 | 38 |
| 1969 | 72.2 | 44.5 |
| 1968 | 68.2 | 47.9 |
| 1967 | 52.8 | 33.2 |
| 1966 | 65.9 | 50.8 |
| 1965 | 75.2 | 52.3 |
| 1964 | 64.7 | 35.4 |
| 1963 | 67.9 | 42.6 |
| 1962 | 66.4 | 35.9 |
| 1961 | 62.2 | 35.5 |
| 1960 | 67.7 | 46.3 |
| 1959 | 65.2 | 47.9 |
| 1958 | 69 | 41 |
| 1957 | 68.5 | 34.6 |
| 1956 | 77.2 | 55.3 |
| 1955 | 71.6 | 51.9 |
| 1954 | 77.2 | 60.8 |
| 1953 | 94 | 58.3 |
| 1952 | 82.5 | 52.2 |
| 1951 | 59.5 | 32.4 |
The month
August 2026 averaged 71.6°F in Lee County, IL, the warmest August in the county average since 2021, tied 52nd warmest of 132 (with 2020, 2000, 1949 and 2 other years) (county average from NOAA's monthly county data, 1895 to 2026).
The month in words
- Tuesday 29 September 2026: a high of 76.1°F averaged over Lee County, IL, the warmest 29 September in the county average since 2025, 21st warmest of 76 (county average from NOAA gridded data, 1951 to 2026).
- Tuesday 29 September 2026: a low of 47.8°F averaged over Lee County, IL, the warmest 29 September night in the county average since 2025, 32nd warmest of 76 (county average from NOAA gridded data, 1951 to 2026).
- Days of the month without a value
- 0
Nearby
Rockford, IL 32.6 mi, the nearest city with its own station