Weather on September 21
Elgin, IL
55 Years of Data
Avg High
74°F
Avg Low
51°F
Warmest
2018
79°F avg
Coldest
1982
46°F avg
About This Date
September 21st in Elgin, IL typically brings pleasant fall weather, with average highs around 74°F and lows near 51°F. Over 54 years of records, the warmest September 21st was in 2018 (79°F average), while the coldest was 1982 (46°F) — a 33°F range across recorded history. Rain or other precipitation has occurred on about 43% of September 21st dates historically, with the wettest September 21st recording 3.68" of rain. The last decade has been 10.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 10.7°F warmer on this date compared to 20-30 years ago.
Planning for September 21st in Elgin, IL? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Warming Trend
3.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 80° | 64° | 72° | 0.51" | — |
| 2024 | 90° | 56° | 73° | — | — |
| 2023 | 79° | 61° | 70° | 0.43" | — |
| 2022 | 91° | 63° | 77° | 0.69" | — |
| 2021 | 81° | 62° | 71° | 1.35" | — |
| 2020 | 73° | 42° | 58° | — | — |
| 2019 | 85° | 65° | 75° | — | — |
| 2018warmest | 92° | 66° | 79° | — | — |
| 2017 | 90° | 61° | 75° | — | — |
| 2016 | 85° | 61° | 73° | — | — |
| 2015 | 73° | 47° | 60° | — | — |
| 2014 | 75° | 55° | 65° | 0.38" | — |
| 2013 | — | 44° | — | — | — |
| 2012 | 71° | 45° | 58° | — | — |
| 2011 | 74° | 52° | 63° | — | — |
| 2010 | 77° | 59° | 68° | 0.05" | — |
| 2009 | 74° | 51° | 62° | 1.19" | — |
| 2008 | 82° | 55° | 69° | — | — |
| 2007 | 82° | 56° | 69° | — | — |
| 2006 | 62° | 39° | 51° | — | — |
| 2005 | 85° | 57° | 71° | — | — |
| 2004 | 78° | 52° | 65° | — | — |
| 2003 | 74° | 42° | 58° | — | — |
| 2002 | 71° | 57° | 64° | 0.43" | — |
| 2001 | 75° | 53° | 64° | 3.68" | — |
| 2000 | 61° | 44° | 52° | 1.14" | — |
| 1999 | 63° | 47° | 55° | — | — |
| 1998 | 87° | 55° | 71° | 1.22" | — |
| 1997 | 67° | 43° | 55° | — | — |
| 1996 | 74° | 48° | 61° | 0.13" | — |
| 1995 | 56° | 46° | 51° | 0.25" | — |
| 1994 | 84° | 55° | 70° | — | — |
| 1993 | 65° | 56° | 60° | 0.66" | — |
| 1992 | 67° | 45° | 56° | 1.24" | — |
| 1991 | 59° | 36° | 47° | — | — |
| 1990 | 70° | 45° | 57° | 1.3" | — |
| 1989 | 77° | 50° | 64° | — | — |
| 1988 | 64° | 49° | 56° | — | — |
| 1987 | 61° | 49° | 55° | — | — |
| 1986 | 68° | 57° | 63° | 0.48" | — |
| 1985 | — | 53° | — | 2.26" | — |
| 1984 | 82° | 55° | 69° | — | — |
| 1983 | 70° | 37° | 53° | 2.11" | — |
| 1982coldest | 55° | 38° | 46° | — | — |
| 1981 | — | 49° | — | — | — |
| 1980 | 85° | 62° | 73° | — | — |
| 1979 | 75° | 41° | 58° | — | — |
| 1978 | 85° | 55° | 70° | 1.22" | — |
| 1977 | 58° | 44° | 51° | — | — |
| 1976 | 65° | 45° | 55° | 0.18" | — |
| 1975 | 57° | 47° | 52° | 0.03" | — |
| 1974 | 67° | 41° | 54° | 0.03" | — |
| 1973 | 60° | 39° | 50° | — | — |
| 1971 | 68° | 35° | 52° | — | — |
54 years of data from ELGIN WATER