Weather on September 18
Greeley, CO
55 Years of Data
Avg High
80°F
Avg Low
47°F
Warmest
2018
73°F avg
Coldest
1971
38°F avg
About This Date
September 18th in Greeley, CO typically brings warm fall weather, with average highs around 80°F and lows near 47°F — a 33°F daily swing. Over 55 years of records, the warmest September 18th was in 2018 (73°F average), while the coldest was 1971 (38°F) — a 35°F range across recorded history. Precipitation has occurred on 20% of recorded September 18th dates, with snow falling 2% of the time (heaviest snowfall: 4"). The last decade has been 3.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.2°F warmer on this date compared to 20-30 years ago.
Planning for September 18th in Greeley, CO? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 74° | 48° | 61° | — | — |
| 2024 | 85° | 45° | 65° | 0.03" | — |
| 2023 | 86° | 54° | 70° | — | — |
| 2022 | 86° | 53° | 70° | — | — |
| 2021 | 94° | 46° | 70° | — | — |
| 2020 | 85° | 48° | 66° | — | — |
| 2019 | 84° | 51° | 68° | — | — |
| 2018warmest | 89° | 57° | 73° | — | — |
| 2017 | 83° | 48° | 65° | — | — |
| 2016 | 89° | 44° | 67° | — | — |
| 2015 | 74° | 52° | 63° | — | — |
| 2014 | 91° | 51° | 71° | — | — |
| 2013 | 84° | 57° | 71° | — | — |
| 2012 | 83° | 44° | 63° | — | — |
| 2011 | 78° | 45° | 61° | 0.1" | — |
| 2010 | 86° | 45° | 65° | 0.03" | — |
| 2009 | 83° | 44° | 63° | — | — |
| 2008 | 83° | 49° | 66° | — | — |
| 2007 | 83° | 48° | 65° | — | — |
| 2006 | 70° | 42° | 56° | — | — |
| 2005 | 88° | 50° | 69° | — | — |
| 2004 | 94° | 48° | 71° | — | — |
| 2003 | 62° | 35° | 49° | — | — |
| 2002 | 76° | 51° | 63° | — | — |
| 2001 | 73° | 49° | 61° | 0.08" | — |
| 2000 | 85° | 55° | 70° | — | — |
| 1999 | 85° | 44° | 64° | — | — |
| 1998 | 93° | 51° | 72° | — | — |
| 1997 | 83° | 55° | 69° | — | — |
| 1996 | 64° | 46° | 55° | 1.3" | — |
| 1995 | 72° | 54° | 63° | 1.7" | — |
| 1994 | 86° | 46° | 66° | — | — |
| 1993 | 51° | 45° | 48° | 1.83" | — |
| 1992 | 71° | 42° | 57° | — | — |
| 1991 | 62° | 41° | 52° | — | — |
| 1990 | 78° | 49° | 63° | 0.64" | — |
| 1989 | 86° | 48° | 67° | 0.05" | — |
| 1988 | 85° | 48° | 66° | — | — |
| 1987 | 72° | 37° | 54° | — | — |
| 1986 | 75° | 50° | 63° | — | — |
| 1985 | 82° | 47° | 64° | 0.05" | — |
| 1984 | 90° | 43° | 66° | — | — |
| 1983 | 81° | 43° | 62° | — | — |
| 1982 | 75° | 45° | 60° | — | — |
| 1981 | 87° | 38° | 62° | — | — |
| 1980 | 91° | 45° | 68° | — | — |
| 1979 | 77° | 48° | 63° | — | — |
| 1978 | 75° | 48° | 62° | — | — |
| 1977 | 80° | 47° | 63° | — | — |
| 1976 | 82° | 48° | 65° | — | — |
| 1975 | 85° | 42° | 63° | — | — |
| 1974 | 82° | 41° | 62° | — | — |
| 1973 | 78° | 42° | 60° | — | — |
| 1972 | 89° | 53° | 71° | — | — |
| 1971coldest | 44° | 32° | 38° | 0.66" | 4" |
55 years of data from GREELEY UNC