Weather on May 15
Rockford, IL
55 Years of Data
Avg High
71°F
Avg Low
48°F
Warmest
2025
77°F avg
Coldest
1997
43°F avg
About This Date
May 15th in Rockford, IL typically brings pleasant spring weather, with average highs around 71°F and lows near 48°F. Over 55 years of records, the warmest May 15th was in 2025 (77°F average), while the coldest was 1997 (43°F) — a 34°F range across recorded history. Rain or other precipitation has occurred on about 53% of May 15th dates historically, with the wettest May 15th recording 9.17" of rain. The last decade has been 5.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.4°F warmer on this date compared to 20-30 years ago.
Planning for May 15th in Rockford, IL? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Warming Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025warmest | 94° | 60° | 77° | 0.05" | — |
| 2024 | 75° | 49° | 62° | — | — |
| 2023 | 72° | 47° | 59° | — | — |
| 2022 | 73° | 51° | 62° | 0.08" | — |
| 2021 | 59° | 53° | 56° | 0.36" | — |
| 2020 | 77° | 57° | 67° | 0.33" | — |
| 2019 | 77° | 46° | 62° | — | — |
| 2018 | 77° | 52° | 64° | — | — |
| 2017 | 85° | 50° | 67° | 0.3" | — |
| 2016 | 58° | 31° | 45° | — | — |
| 2015 | 76° | 58° | 67° | 0.05" | — |
| 2014 | 57° | 42° | 50° | 0.46" | — |
| 2013 | 82° | 59° | 71° | — | — |
| 2012 | 86° | 53° | 70° | 0.1" | — |
| 2011 | 59° | 42° | 51° | 0.03" | — |
| 2010 | 65° | 43° | 54° | — | — |
| 2009 | 59° | 52° | 55° | 0.41" | — |
| 2008 | 62° | 41° | 52° | — | — |
| 2007 | 77° | 53° | 65° | 0.15" | — |
| 2006 | 65° | 51° | 58° | 0.46" | — |
| 2005 | 55° | 39° | 47° | 0.03" | — |
| 2004 | 61° | 41° | 51° | — | — |
| 2003 | 63° | 44° | 53° | — | — |
| 2002 | 75° | 42° | 59° | — | — |
| 2001 | 87° | 61° | 74° | — | — |
| 2000 | 71° | 37° | 54° | — | — |
| 1999 | 68° | 51° | 60° | 0.03" | — |
| 1998 | 83° | 64° | 73° | 0.89" | — |
| 1997coldest | 52° | 35° | 43° | 0.03" | — |
| 1996 | 59° | 47° | 53° | 0.13" | — |
| 1995 | 74° | 42° | 58° | — | — |
| 1994 | 74° | 55° | 64° | 0.05" | — |
| 1993 | 68° | 50° | 59° | 0.03" | — |
| 1992 | 77° | 44° | 61° | — | — |
| 1991 | 87° | 58° | 72° | 0.05" | — |
| 1990 | 63° | 52° | 57° | 0.43" | — |
| 1989 | 75° | 47° | 61° | 0.03" | — |
| 1988 | 82° | 59° | 71° | 0.08" | — |
| 1987 | 72° | 47° | 59° | — | — |
| 1986 | 70° | 52° | 61° | 0.97" | — |
| 1985 | 62° | 52° | 57° | 0.13" | — |
| 1984 | 66° | 39° | 53° | — | — |
| 1983 | 61° | 39° | 50° | — | — |
| 1982 | 81° | 61° | 71° | 0.66" | — |
| 1981 | 71° | 42° | 57° | — | — |
| 1980 | 67° | 43° | 55° | 0.15" | — |
| 1979 | 66° | 39° | 53° | — | — |
| 1978 | 64° | 47° | 55° | — | — |
| 1977 | 82° | 65° | 73° | 9.17" | — |
| 1976 | 65° | 53° | 59° | 0.91" | — |
| 1975 | 64° | 43° | 53° | — | — |
| 1974 | 62° | 43° | 52° | — | — |
| 1973 | 65° | 36° | 50° | — | — |
| 1972 | 72° | 51° | 61° | — | — |
| 1971 | 83° | 54° | 68° | — | — |
55 years of data from ROCKFORD GTR ROCKFORD AP