Weather on September 18
Denver, CO
55 Years of Data
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.
| 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" |
Denver, CO Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Denver, CO Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Denver, CO Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Denver, CO
Denver, CO has no months that meet our "pleasant" threshold — every season has tradeoffs.