Warren County, IL
: September 2026 so far averaged 71°F in Warren County, IL, the warmest 1 to 29 September in the county average since the data begin in 1951 (county average from NOAA gridded data, 1951 to 2026).
Last updated . This page normally updates every day; the latest update is late.
- High
- 77.2°F
- Warmest since 2025
- 23rd warmest of 76
- Low
- 48°F
- Warmest since 2025
- 33rd warmest of 76
No measurable precipitation in the county average of Warren County, IL for 2 days to Tuesday 29 September 2026 (county average from NOAA gridded data, 1951 to 2026).
- Normal range, 59.9 to 80.8°F
Every year as a table
Every 29 September low of the county average in Warren County, IL since 1951: 48°F in 2026; the lowest is 31.9°F, in 1984.
| Year | High, °F | Low, °F |
|---|---|---|
| 2026 | 77.2 | 48 |
| 2025 | 88.6 | 55 |
| 2024 | 79.4 | 58.2 |
| 2023 | 74.2 | 57.1 |
| 2022 | 63 | 38.4 |
| 2021 | 85 | 57.4 |
| 2020 | 63.8 | 44.8 |
| 2019 | 70.1 | 58.7 |
| 2018 | 59.6 | 42.2 |
| 2017 | 74.2 | 45.7 |
| 2016 | 64.5 | 49.5 |
| 2015 | 81.6 | 59.5 |
| 2014 | 83.5 | 54.7 |
| 2013 | 78.4 | 46.6 |
| 2012 | 70.1 | 40.7 |
| 2011 | 68.6 | 47.6 |
| 2010 | 74.6 | 47 |
| 2009 | 62.6 | 47.6 |
| 2008 | 76.9 | 55.9 |
| 2007 | 78.5 | 49.6 |
| 2006 | 62 | 41.7 |
| 2005 | 67.6 | 41.7 |
| 2004 | 68.8 | 41.1 |
| 2003 | 57.8 | 36.5 |
| 2002 | 80.7 | 54.9 |
| 2001 | 65.4 | 42.6 |
| 2000 | 73.5 | 47.2 |
| 1999 | 56 | 45.8 |
| 1998 | 81.2 | 59.1 |
| 1997 | 75.4 | 52.6 |
| 1996 | 66.6 | 44.7 |
| 1995 | 78.9 | 51.9 |
| 1994 | 71.3 | 44.4 |
| 1993 | 63.7 | 37.8 |
| 1992 | 59.9 | 36.8 |
| 1991 | 71 | 43.4 |
| 1990 | 73.7 | 52.4 |
| 1989 | 74.8 | 40.6 |
| 1988 | 78.5 | 59.3 |
| 1987 | 79.8 | 55.5 |
| 1986 | 84.2 | 66.4 |
| 1985 | 72.5 | 49.1 |
| 1984 | 52.1 | 31.9 |
| 1983 | 83.2 | 55.5 |
| 1982 | 78.3 | 55 |
| 1981 | 67.1 | 41.7 |
| 1980 | 76.2 | 45 |
| 1979 | 84.7 | 53.8 |
| 1978 | 67.6 | 43 |
| 1977 | 71.2 | 46.9 |
| 1976 | 62.4 | 49.4 |
| 1975 | 69 | 45 |
| 1974 | 68.8 | 43.9 |
| 1973 | 77.8 | 63.4 |
| 1972 | 74.6 | 44.2 |
| 1971 | 87.2 | 64.2 |
| 1970 | 71.7 | 40.9 |
| 1969 | 76 | 47.1 |
| 1968 | 70.5 | 46.7 |
| 1967 | 56.1 | 33.6 |
| 1966 | 68 | 50.5 |
| 1965 | 76.5 | 52.4 |
| 1964 | 66.3 | 36.7 |
| 1963 | 76.6 | 45.7 |
| 1962 | 69.2 | 35.8 |
| 1961 | 65 | 37.4 |
| 1960 | 71 | 47.9 |
| 1959 | 66.6 | 47.4 |
| 1958 | 69.9 | 41 |
| 1957 | 68.9 | 35.3 |
| 1956 | 80.7 | 53.9 |
| 1955 | 77.2 | 55.3 |
| 1954 | 80.1 | 62.9 |
| 1953 | 96.7 | 60.9 |
| 1952 | 86.4 | 55.2 |
| 1951 | 59.6 | 34 |
The month
August 2026 averaged 73.6°F in Warren County, IL, the warmest August in the county average since 2021, 42nd warmest of 132 (county average from NOAA's monthly county data, 1895 to 2026).
The month in words
- Tuesday 29 September 2026: a high of 77.2°F averaged over Warren County, IL, the warmest 29 September in the county average since 2025, tied 23rd warmest of 76 (with 1955) (county average from NOAA gridded data, 1951 to 2026).
- Tuesday 29 September 2026: a low of 48°F averaged over Warren County, IL, the warmest 29 September night in the county average since 2025, 33rd warmest of 76 (county average from NOAA gridded data, 1951 to 2026).
- Days of the month without a value
- 0
Nearby
Burlington, IA 27.0 mi, the nearest city with its own station