Weather on October 18
Boulder, CO
55 Years of Data
Avg High
65°F
Avg Low
37°F
Warmest
2003
67°F avg
Coldest
2006
33°F avg
About This Date
October 18th in Boulder, CO typically brings mild fall weather, with average highs around 65°F and lows near 37°F — a 28°F daily swing. Over 55 years of records, the warmest October 18th was in 2003 (67°F average), while the coldest was 2006 (33°F) — a 34°F range across recorded history. Precipitation has occurred on 15% of recorded October 18th dates, with snow falling 4% of the time (heaviest snowfall: 3.2"). The last decade has been 1.3°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.3°F cooler on this date compared to 20-30 years ago.
Planning for October 18th in Boulder, CO? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 61° | 36° | 48° | — | — |
| 2024 | 54° | 41° | 47° | — | — |
| 2023 | 72° | 43° | 57° | — | — |
| 2022 | 68° | 36° | 52° | — | — |
| 2021 | 75° | 45° | 60° | — | — |
| 2020 | 43° | 32° | 37° | — | — |
| 2019 | 64° | 45° | 54° | — | — |
| 2018 | 66° | 34° | 50° | — | — |
| 2017 | 77° | 55° | 66° | — | — |
| 2016 | 63° | 37° | 50° | — | — |
| 2015 | 78° | 42° | 60° | — | — |
| 2014 | 70° | 35° | 52° | — | — |
| 2013 | 46° | 31° | 38° | 0.91" | 3.2" |
| 2012 | 66° | 27° | 46° | — | — |
| 2011 | 61° | 33° | 47° | — | — |
| 2010 | 66° | 37° | 52° | 0.05" | — |
| 2009 | 83° | 42° | 62° | — | — |
| 2008 | 77° | 41° | 59° | — | — |
| 2007 | 56° | 40° | 48° | — | — |
| 2006coldest | 43° | 24° | 33° | 0.46" | 1.5" |
| 2005 | 78° | 42° | 60° | — | — |
| 2004 | 69° | 39° | 54° | — | — |
| 2003warmest | 85° | 49° | 67° | — | — |
| 2002 | 71° | 38° | 54° | — | — |
| 2001 | 72° | 38° | 55° | — | — |
| 2000 | 74° | 36° | 55° | — | — |
| 1999 | 40° | 30° | 35° | 0.33" | — |
| 1998 | 62° | 28° | 45° | — | — |
| 1997 | 77° | 46° | 62° | — | — |
| 1996 | 71° | 23° | 47° | — | — |
| 1995 | 80° | 43° | 61° | — | — |
| 1994 | 60° | 33° | 47° | — | — |
| 1993 | 44° | 38° | 41° | 1.91" | — |
| 1992 | 67° | 31° | 49° | — | — |
| 1991 | 75° | 34° | 54° | — | — |
| 1990 | 64° | 29° | 46° | — | — |
| 1989 | 37° | 30° | 34° | — | — |
| 1988 | 71° | 41° | 56° | — | — |
| 1987 | 58° | 34° | 46° | — | — |
| 1986 | 68° | 36° | 52° | — | — |
| 1985 | 60° | 42° | 51° | — | — |
| 1984 | 47° | 32° | 39° | — | — |
| 1983 | 67° | 44° | 55° | 0.03" | — |
| 1982 | 72° | 45° | 58° | — | — |
| 1981 | 60° | 31° | 45° | — | — |
| 1980 | 58° | 32° | 45° | — | — |
| 1979 | 70° | 44° | 57° | — | — |
| 1978 | 60° | 41° | 51° | 0.08" | — |
| 1977 | 73° | 39° | 56° | — | — |
| 1976 | 68° | 22° | 45° | — | — |
| 1975 | 74° | 39° | 56° | — | — |
| 1974 | 77° | 45° | 61° | — | — |
| 1973 | 77° | 44° | 61° | — | — |
| 1972 | 70° | 37° | 53° | 0.1" | — |
| 1971 | 56° | 36° | 46° | — | — |
55 years of data from BOULDER MUNI AP