Weather on September 17
Greeley, CO
55 Years of Data
Avg High
81°F
Avg Low
47°F
Warmest
2018
78°F avg
Coldest
1971
37°F avg
About This Date
September 17th in Greeley, CO typically brings warm fall weather, with average highs around 81°F and lows near 47°F — a 34°F daily swing. Over 55 years of records, the warmest September 17th was in 2018 (78°F average), while the coldest was 1971 (37°F) — a 41°F range across recorded history. Precipitation has occurred on 24% of recorded September 17th dates, with snow falling 2% of the time (heaviest snowfall: 5"). The last decade has been 1.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.5°F warmer on this date compared to 20-30 years ago.
Planning for September 17th in Greeley, CO? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 71° | 47° | 59° | 0.64" | — |
| 2024 | 84° | 52° | 68° | 0.08" | — |
| 2023 | 87° | 45° | 66° | — | — |
| 2022 | 84° | 54° | 69° | — | — |
| 2021 | 92° | 47° | 69° | — | — |
| 2020 | 87° | 46° | 67° | — | — |
| 2019 | 91° | 51° | 71° | — | — |
| 2018warmest | 96° | 59° | 78° | — | — |
| 2017 | 78° | 49° | 63° | — | — |
| 2016 | 81° | 44° | 62° | — | — |
| 2015 | 86° | 49° | 67° | — | — |
| 2014 | 90° | 51° | 70° | — | — |
| 2013 | 86° | 52° | 69° | 0.05" | — |
| 2012 | 89° | 51° | 70° | 0.03" | — |
| 2011 | 78° | 47° | 62° | 0.1" | — |
| 2010 | 91° | 48° | 70° | — | — |
| 2009 | 81° | 46° | 63° | — | — |
| 2008 | 85° | 47° | 66° | — | — |
| 2007 | 76° | 53° | 64° | 0.3" | — |
| 2006 | 72° | 33° | 52° | — | — |
| 2005 | 90° | 45° | 67° | — | — |
| 2004 | 94° | 49° | 71° | — | — |
| 2003 | 80° | 40° | 60° | 0.33" | — |
| 2002 | 81° | 48° | 64° | — | — |
| 2001 | 68° | 53° | 61° | — | — |
| 2000 | 95° | 55° | 75° | — | — |
| 1999 | 82° | 46° | 64° | — | — |
| 1998 | 91° | 51° | 71° | — | — |
| 1997 | 86° | 46° | 66° | — | — |
| 1996 | 65° | 52° | 58° | 0.43" | — |
| 1995 | 87° | 48° | 68° | — | — |
| 1994 | 81° | 47° | 64° | — | — |
| 1993 | 69° | 49° | 59° | 0.25" | — |
| 1992 | 85° | 49° | 67° | — | — |
| 1991 | 67° | 44° | 55° | — | — |
| 1990 | 67° | 58° | 62° | 0.1" | — |
| 1989 | 88° | 48° | 68° | — | — |
| 1988 | 85° | 44° | 64° | — | — |
| 1987 | 56° | 49° | 52° | 0.08" | — |
| 1986 | 83° | 45° | 64° | — | — |
| 1985 | 86° | 50° | 68° | — | — |
| 1984 | 85° | 43° | 64° | — | — |
| 1983 | 92° | 48° | 70° | — | — |
| 1982 | 56° | 48° | 52° | 0.13" | — |
| 1981 | 75° | 39° | 57° | — | — |
| 1980 | 87° | 40° | 63° | — | — |
| 1979 | 86° | 40° | 63° | — | — |
| 1978 | 72° | 54° | 63° | — | — |
| 1977 | 84° | 46° | 65° | — | — |
| 1976 | 82° | 54° | 68° | — | — |
| 1975 | 88° | 47° | 67° | — | — |
| 1974 | 78° | 43° | 60° | — | — |
| 1973 | 64° | 42° | 53° | — | — |
| 1972 | 89° | 49° | 69° | — | — |
| 1971coldest | 41° | 32° | 37° | 4.27" | 5" |
55 years of data from GREELEY UNC