Weather on September 1
Rockford, IL
55 Years of Data
Avg High
80°F
Avg Low
59°F
Warmest
2000
81°F avg
Coldest
1994
58°F avg
About This Date
September 1st in Rockford, IL typically brings warm fall weather, with average highs around 80°F and lows near 59°F. Over 55 years of records, the warmest September 1st was in 2000 (81°F average), while the coldest was 1994 (58°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 22% of September 1st dates historically, with the wettest September 1st recording 4.37" of rain. The last decade has been 1.8°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.8°F cooler on this date compared to 20-30 years ago.
Planning for September 1st in Rockford, IL? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 78° | 53° | 66° | — | — |
| 2024 | 77° | 53° | 65° | — | — |
| 2023 | 81° | 53° | 67° | — | — |
| 2022 | 85° | 61° | 73° | — | — |
| 2021 | 82° | 59° | 71° | — | — |
| 2020 | 74° | 59° | 66° | — | — |
| 2019 | 75° | 61° | 68° | 0.43" | — |
| 2018 | 84° | 68° | 76° | 4.37" | — |
| 2017 | 71° | 50° | 61° | — | — |
| 2016 | 77° | 58° | 67° | — | — |
| 2015 | 89° | 69° | 79° | — | — |
| 2014 | 83° | 68° | 75° | 0.08" | — |
| 2013 | 88° | 61° | 74° | — | — |
| 2012 | 77° | 70° | 73° | — | — |
| 2011 | 93° | 70° | 81° | — | — |
| 2010 | 79° | 67° | 73° | 1.14" | — |
| 2009 | 71° | 45° | 58° | — | — |
| 2008 | 90° | 61° | 75° | — | — |
| 2007 | 80° | 55° | 68° | — | — |
| 2006 | 76° | 60° | 68° | — | — |
| 2005 | 82° | 60° | 71° | — | — |
| 2004 | 82° | 58° | 70° | — | — |
| 2003 | 74° | 56° | 65° | — | — |
| 2002 | 85° | 61° | 73° | — | — |
| 2001 | 72° | 49° | 60° | — | — |
| 2000warmest | 94° | 69° | 81° | — | — |
| 1999 | 83° | 50° | 66° | — | — |
| 1998 | 80° | 60° | 70° | — | — |
| 1997 | 83° | 57° | 70° | — | — |
| 1996 | 82° | 62° | 72° | — | — |
| 1995 | 79° | 56° | 67° | — | — |
| 1994coldest | 71° | 45° | 58° | — | — |
| 1993 | 75° | 50° | 63° | — | — |
| 1992 | 76° | 47° | 61° | — | — |
| 1991 | 81° | 58° | 69° | — | — |
| 1990 | 89° | 65° | 77° | — | — |
| 1989 | 78° | 61° | 69° | 1.09" | — |
| 1988 | 85° | 55° | 70° | — | — |
| 1987 | 77° | 46° | 62° | — | — |
| 1986 | 83° | 52° | 67° | — | — |
| 1985 | 80° | 65° | 72° | — | — |
| 1984 | 94° | 59° | 76° | 0.41" | — |
| 1983 | 83° | 59° | 71° | — | — |
| 1982 | 81° | 60° | 70° | 0.25" | — |
| 1981 | 72° | 61° | 66° | 2.11" | — |
| 1980 | 77° | 65° | 71° | 1.12" | — |
| 1979 | 84° | 69° | 77° | — | — |
| 1978 | 84° | 59° | 72° | — | — |
| 1977 | 73° | 63° | 68° | 0.38" | — |
| 1976 | 68° | 50° | 59° | — | — |
| 1975 | 84° | 58° | 71° | — | — |
| 1974 | 70° | 53° | 61° | 0.13" | — |
| 1973 | 91° | 70° | 80° | — | — |
| 1972 | 72° | 62° | 67° | 0.03" | — |
| 1971 | 88° | 65° | 76° | — | — |
55 years of data from ROCKFORD GTR ROCKFORD AP