Weather on September 18
Denver, CO
55 Years of Data
Avg High
80°F
Avg Low
46°F
Warmest
2018
74°F avg
Coldest
1971
31°F avg
About This Date
September 18th in Denver, CO typically brings warm fall weather, with average highs around 80°F and lows near 46°F — a 34°F daily swing. Over 55 years of records, the warmest September 18th was in 2018 (74°F average), while the coldest was 1971 (31°F) — a 43°F range across recorded history. Precipitation has occurred on 22% of recorded September 18th dates, with snow falling 2% of the time. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for September 18th in Denver, CO? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 75° | 44° | 60° | 0.05" | — |
| 2024 | 84° | 44° | 64° | — | — |
| 2023 | 86° | 41° | 64° | — | — |
| 2022 | 85° | 50° | 67° | — | — |
| 2021 | 73° | 44° | 59° | — | — |
| 2020 | 85° | 48° | 66° | — | — |
| 2019 | 89° | 55° | 72° | — | — |
| 2018warmest | 93° | 55° | 74° | — | — |
| 2017 | 71° | 49° | 60° | 0.03" | — |
| 2016 | 82° | 48° | 65° | — | — |
| 2015 | 76° | 49° | 62° | — | — |
| 2014 | 90° | 52° | 71° | — | — |
| 2013 | 84° | 52° | 68° | — | — |
| 2012 | 66° | 43° | 54° | — | — |
| 2011 | 78° | 44° | 61° | — | — |
| 2010 | 86° | 52° | 69° | 0.1" | — |
| 2009 | 78° | 46° | 62° | — | — |
| 2008 | 88° | 52° | 70° | — | — |
| 2007 | 73° | 54° | 63° | 0.18" | — |
| 2006 | 67° | 38° | 52° | — | — |
| 2005 | 89° | 45° | 67° | — | — |
| 2004 | 93° | 52° | 72° | — | — |
| 2003 | 86° | 35° | 61° | 0.13" | — |
| 2002 | 85° | 49° | 67° | — | — |
| 2001 | 75° | 44° | 60° | — | — |
| 2000 | 85° | 59° | 72° | — | — |
| 1999 | 82° | 46° | 64° | — | — |
| 1998 | 92° | 52° | 72° | — | — |
| 1997 | 83° | 56° | 69° | — | — |
| 1996 | 62° | 38° | 50° | 1.8" | — |
| 1995 | 86° | 45° | 65° | — | — |
| 1994 | 85° | 48° | 66° | — | — |
| 1993 | 71° | 41° | 56° | 0.46" | — |
| 1992 | 70° | 41° | 55° | — | — |
| 1991 | 55° | 39° | 47° | 0.1" | — |
| 1990 | 76° | 50° | 63° | 1.17" | — |
| 1989 | 88° | 58° | 73° | — | — |
| 1988 | 81° | — | — | — | — |
| 1987 | 67° | 38° | 52° | — | — |
| 1986 | 72° | 44° | 58° | — | — |
| 1985 | 83° | 58° | 70° | — | — |
| 1984 | 84° | 50° | 67° | — | — |
| 1983 | 84° | 43° | 63° | — | — |
| 1982 | 76° | 44° | 60° | 0.08" | — |
| 1981 | 87° | 40° | 63° | — | — |
| 1980 | 90° | 46° | 68° | — | — |
| 1979 | 79° | 44° | 61° | — | — |
| 1978 | 74° | 48° | 61° | — | — |
| 1977 | 78° | 36° | 57° | — | — |
| 1976 | 81° | 48° | 64° | 0.08" | — |
| 1975 | 78° | 39° | 59° | — | — |
| 1974 | 80° | 40° | 60° | — | — |
| 1973 | 84° | 39° | 62° | — | — |
| 1972 | 85° | 52° | 68° | — | — |
| 1971coldest | 40° | 23° | 31° | 0.2" | 0.9" |
55 years of data from NORTHGLENN