Weather on September 21
Greeley, CO
55 Years of Data
Avg High
77°F
Avg Low
45°F
Warmest
2007
77°F avg
Coldest
1995
36°F avg
About This Date
September 21st in Greeley, CO typically brings pleasant fall weather, with average highs around 77°F and lows near 45°F — a 32°F daily swing. Over 55 years of records, the warmest September 21st was in 2007 (77°F average), while the coldest was 1995 (36°F) — a 41°F range across recorded history. Precipitation has occurred on 27% of recorded September 21st dates, with snow falling 4% of the time. The last decade has been 8.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 8.1°F warmer on this date compared to 20-30 years ago.
Planning for September 21st in Greeley, CO? Great weather for outdoor activities.
Warming Trend
2.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 87° | 50° | 69° | 0.03" | — |
| 2024 | 84° | 54° | 69° | — | — |
| 2023 | 84° | 53° | 69° | — | — |
| 2022 | 85° | 54° | 69° | 0.1" | — |
| 2021 | 69° | 40° | 54° | 0.25" | — |
| 2020 | 90° | 51° | 70° | — | — |
| 2019 | 87° | 47° | 67° | — | — |
| 2018 | 80° | 47° | 63° | — | — |
| 2017 | 95° | 42° | 69° | — | — |
| 2016 | 87° | 59° | 73° | — | — |
| 2015 | 91° | 46° | 69° | — | — |
| 2014 | 80° | 57° | 69° | — | — |
| 2013 | 84° | 46° | 65° | — | — |
| 2012 | 82° | 51° | 67° | — | — |
| 2011 | 68° | 45° | 56° | — | — |
| 2010 | 84° | 48° | 66° | 0.05" | — |
| 2009 | 72° | 39° | 55° | 1.04" | — |
| 2008 | 81° | 54° | 67° | — | — |
| 2007warmest | 96° | 57° | 77° | — | — |
| 2006 | 73° | 51° | 62° | 0.03" | — |
| 2005 | 90° | 56° | 73° | — | — |
| 2004 | 97° | 45° | 71° | 1.47" | — |
| 2003 | 76° | 41° | 58° | — | — |
| 2002 | 66° | 40° | 53° | — | — |
| 2001 | 87° | 46° | 67° | — | — |
| 2000 | 66° | 39° | 53° | — | — |
| 1999 | 75° | 35° | 55° | — | — |
| 1998 | 50° | 46° | 48° | 0.46" | — |
| 1997 | 62° | 46° | 54° | 0.25" | — |
| 1996 | 79° | 39° | 59° | — | — |
| 1995coldest | 39° | 32° | 36° | 0.18" | 1" |
| 1994 | 62° | 36° | 49° | 1.19" | 0.5" |
| 1993 | 85° | 42° | 63° | — | — |
| 1992 | 75° | 54° | 64° | — | — |
| 1991 | 90° | 43° | 66° | — | — |
| 1990 | 72° | 45° | 58° | — | — |
| 1989 | 66° | 46° | 56° | 0.2" | — |
| 1988 | 82° | 50° | 66° | — | — |
| 1987 | 74° | 37° | 55° | — | — |
| 1986 | 72° | 46° | 59° | 0.18" | — |
| 1985 | 74° | 43° | 58° | — | — |
| 1984 | 81° | 46° | 63° | — | — |
| 1983 | 68° | 25° | 46° | — | — |
| 1982 | 78° | 43° | 60° | — | — |
| 1981 | 84° | 53° | 69° | — | — |
| 1980 | 84° | 46° | 65° | — | — |
| 1979 | 74° | 47° | 60° | 0.38" | — |
| 1978 | 68° | 29° | 48° | — | — |
| 1977 | 82° | 52° | 67° | — | — |
| 1976 | 74° | 43° | 58° | — | — |
| 1975 | 65° | 33° | 49° | — | — |
| 1974 | 66° | 35° | 51° | — | — |
| 1973 | 78° | 52° | 65° | — | — |
| 1972 | 74° | 39° | 56° | — | — |
| 1971 | 63° | 36° | 49° | 0.69" | — |
55 years of data from GREELEY UNC