Weather on September 21
Cedar Rapids, IA
55 Years of Data
Avg High
74°F
Avg Low
52°F
Warmest
2017
81°F avg
Coldest
1983
45°F avg
About This Date
September 21st in Cedar Rapids, IA typically brings pleasant fall weather, with average highs around 74°F and lows near 52°F. Over 55 years of records, the warmest September 21st was in 2017 (81°F average), while the coldest was 1983 (45°F) — a 36°F range across recorded history. Rain or other precipitation has occurred on about 27% of September 21st dates historically, with the wettest September 21st recording 1.93" of rain. The last decade has been 11.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 11.2°F warmer on this date compared to 20-30 years ago.
Planning for September 21st in Cedar Rapids, IA? Great weather for outdoor activities.
Warming Trend
2.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 78° | 59° | 69° | — | — |
| 2024 | 88° | 59° | 73° | — | — |
| 2023 | 78° | 55° | 67° | — | — |
| 2022 | 94° | 68° | 81° | — | — |
| 2021 | 81° | 55° | 68° | 0.81" | — |
| 2020 | 77° | 46° | 62° | — | — |
| 2019 | 85° | 70° | 77° | 0.46" | — |
| 2018 | 89° | 59° | 74° | 0.3" | — |
| 2017warmest | 94° | 68° | 81° | — | — |
| 2016 | 87° | 68° | 78° | — | — |
| 2015 | 75° | 47° | 61° | — | — |
| 2014 | 77° | 54° | 65° | — | — |
| 2013 | 69° | 47° | 58° | — | — |
| 2012 | 67° | 44° | 55° | 0.05" | — |
| 2011 | 77° | 52° | 64° | — | — |
| 2010 | 83° | 64° | 73° | 1.93" | — |
| 2009 | 74° | 52° | 63° | 0.33" | — |
| 2008 | 82° | 53° | 68° | — | — |
| 2007 | 87° | 67° | 77° | — | — |
| 2006 | 67° | 47° | 57° | — | — |
| 2005 | 91° | 60° | 76° | — | — |
| 2004 | 84° | 58° | 71° | — | — |
| 2003 | 69° | 59° | 64° | 0.51" | — |
| 2002 | 71° | 53° | 62° | — | — |
| 2001 | 69° | 55° | 62° | 0.08" | — |
| 2000 | 64° | 39° | 52° | — | — |
| 1999 | 64° | 35° | 50° | — | — |
| 1998 | 77° | 51° | 64° | — | — |
| 1997 | 65° | 41° | 53° | — | — |
| 1996 | 71° | 58° | 64° | — | — |
| 1995 | 52° | 42° | 47° | 0.1" | — |
| 1994 | 83° | 58° | 70° | — | — |
| 1993 | 69° | 55° | 62° | — | — |
| 1992 | 62° | 55° | 59° | 0.46" | — |
| 1991 | 67° | 34° | 50° | — | — |
| 1990 | 69° | 60° | 65° | 0.36" | — |
| 1989 | 78° | 52° | 65° | — | — |
| 1988 | 70° | 43° | 56° | 0.15" | — |
| 1987 | 65° | 47° | 56° | 0.28" | — |
| 1986 | 86° | 62° | 74° | — | — |
| 1985 | 61° | 49° | 55° | 1.09" | — |
| 1984 | 85° | 54° | 69° | — | — |
| 1983coldest | 53° | 37° | 45° | — | — |
| 1982 | 61° | 36° | 48° | — | — |
| 1981 | 73° | 55° | 64° | — | — |
| 1980 | 84° | 61° | 72° | — | — |
| 1979 | 78° | 46° | 62° | — | — |
| 1978 | 65° | 50° | 57° | — | — |
| 1977 | 73° | 50° | 62° | — | — |
| 1976 | 66° | 46° | 56° | — | — |
| 1975 | 55° | 48° | 52° | — | — |
| 1974 | 63° | 42° | 52° | — | — |
| 1973 | 71° | 49° | 60° | 0.03" | — |
| 1972 | 74° | 52° | 63° | — | — |
| 1971 | 73° | 45° | 59° | — | — |
55 years of data from CEDAR RAPIDS #1