Weather on August 31
Rockford, IL
55 Years of Data
Avg High
81°F
Avg Low
59°F
Warmest
2000
81°F avg
Coldest
2009
57°F avg
About This Date
August 31st in Rockford, IL typically brings warm summer weather, with average highs around 81°F and lows near 59°F. Over 55 years of records, the warmest August 31st was in 2000 (81°F average), while the coldest was 2009 (57°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 18% of August 31st dates historically, with the wettest August 31st recording 5.89" of rain. The last decade has been 1.1°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.1°F cooler on this date compared to 20-30 years ago.
Planning for August 31st in Rockford, IL? Stay hydrated and seek shade during peak afternoon hours.
Cooling Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 75° | 51° | 63° | — | — |
| 2024 | 83° | 56° | 69° | — | — |
| 2023 | 77° | 50° | 64° | — | — |
| 2022 | 85° | 56° | 70° | — | — |
| 2021 | 83° | 60° | 71° | 0.08" | — |
| 2020 | 84° | 61° | 72° | 0.13" | — |
| 2019 | 77° | 57° | 67° | 0.03" | — |
| 2018 | 84° | 56° | 70° | — | — |
| 2017 | 72° | 55° | 63° | — | — |
| 2016 | 79° | 61° | 70° | — | — |
| 2015 | 85° | 58° | 71° | — | — |
| 2014 | 85° | 61° | 73° | — | — |
| 2013 | 82° | 67° | 74° | — | — |
| 2012 | 94° | 66° | 80° | — | — |
| 2011 | 85° | 64° | 74° | — | — |
| 2010 | 89° | 72° | 80° | — | — |
| 2009coldest | 69° | 45° | 57° | — | — |
| 2008 | 89° | 59° | 74° | — | — |
| 2007 | 82° | 54° | 68° | — | — |
| 2006 | 77° | 55° | 66° | — | — |
| 2005 | 79° | 58° | 68° | — | — |
| 2004 | 81° | 54° | 67° | — | — |
| 2003 | 68° | 58° | 63° | 0.33" | — |
| 2002 | 82° | 61° | 71° | — | — |
| 2001 | 76° | 56° | 66° | — | — |
| 2000warmest | 93° | 70° | 81° | — | — |
| 1999 | 77° | 52° | 64° | — | — |
| 1998 | 80° | 54° | 67° | — | — |
| 1997 | 83° | 63° | 73° | — | — |
| 1996 | 82° | 57° | 70° | — | — |
| 1995 | 87° | 64° | 76° | — | — |
| 1994 | 68° | 51° | 60° | — | — |
| 1993 | 75° | 56° | 65° | 0.79" | — |
| 1992 | 72° | 48° | 60° | — | — |
| 1991 | 84° | 60° | 72° | — | — |
| 1990 | 81° | 56° | 68° | — | — |
| 1989 | 76° | 59° | 67° | 3.18" | — |
| 1988 | 85° | 52° | 68° | — | — |
| 1987 | 69° | 51° | 60° | — | — |
| 1986 | 80° | 56° | 68° | — | — |
| 1985 | 77° | 51° | 64° | — | — |
| 1984 | 82° | 45° | 63° | 0.18" | — |
| 1983 | 82° | 67° | 74° | — | — |
| 1982 | 76° | 64° | 70° | — | — |
| 1981 | 86° | 67° | 76° | 5.89" | — |
| 1980 | 79° | 68° | 73° | 0.74" | — |
| 1979 | 85° | 65° | 75° | — | — |
| 1978 | 82° | 57° | 70° | — | — |
| 1977 | 87° | 69° | 78° | 0.18" | — |
| 1976 | 88° | 58° | 73° | — | — |
| 1975 | 72° | 65° | 68° | — | — |
| 1974 | 71° | 57° | 64° | — | — |
| 1973 | 90° | 70° | 80° | — | — |
| 1972 | 84° | 69° | 77° | — | — |
| 1971 | 84° | 60° | 72° | — | — |
55 years of data from ROCKFORD GTR ROCKFORD AP