Weather on October 15
Boulder, CO
55 Years of Data
Avg High
67°F
Avg Low
38°F
Warmest
2016
72°F avg
Coldest
1984
32°F avg
About This Date
October 15th in Boulder, CO typically brings mild fall weather, with average highs around 67°F and lows near 38°F — a 29°F daily swing. Over 55 years of records, the warmest October 15th was in 2016 (72°F average), while the coldest was 1984 (32°F) — a 40°F range across recorded history. Precipitation has occurred on 13% of recorded October 15th dates, with snow falling 4% of the time (heaviest snowfall: 5"). The last decade has been 1.0°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.0°F cooler on this date compared to 20-30 years ago.
Planning for October 15th in Boulder, CO? Great weather for outdoor activities.
Cooling Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 68° | 45° | 56° | — | — |
| 2024 | 72° | 46° | 59° | — | — |
| 2023 | 66° | 32° | 49° | — | — |
| 2022 | 63° | 41° | 52° | — | — |
| 2021 | 55° | 32° | 44° | — | — |
| 2020 | 54° | 36° | 45° | — | — |
| 2019 | 59° | 36° | 47° | — | — |
| 2018 | 46° | 18° | 32° | — | — |
| 2017 | 62° | 27° | 44° | — | — |
| 2016warmest | 84° | 61° | 72° | — | — |
| 2015 | 68° | 43° | 55° | — | — |
| 2014 | 75° | 38° | 56° | — | — |
| 2013 | 45° | 33° | 39° | — | — |
| 2012 | 78° | 43° | 60° | — | — |
| 2011 | 84° | 42° | 63° | — | — |
| 2010 | 80° | 42° | 61° | — | — |
| 2009 | 68° | 43° | 55° | — | — |
| 2008 | 60° | 29° | 44° | — | — |
| 2007 | 61° | 36° | 48° | 0.38" | — |
| 2006 | 68° | 40° | 54° | — | — |
| 2005 | 72° | 40° | 56° | — | — |
| 2004 | 62° | 37° | 50° | 0.23" | — |
| 2003 | 73° | 36° | 54° | — | — |
| 2002 | 61° | 29° | 45° | — | — |
| 2001 | 62° | 31° | 46° | 0.18" | 0.1" |
| 2000 | 51° | 31° | 41° | — | — |
| 1999 | 73° | 37° | 55° | — | — |
| 1998 | 68° | 37° | 53° | — | — |
| 1997 | 65° | 40° | 52° | — | — |
| 1996 | 73° | 42° | 58° | — | — |
| 1995 | 83° | 45° | 64° | — | — |
| 1994 | 51° | 43° | 47° | 0.28" | — |
| 1993 | 59° | 38° | 48° | — | — |
| 1992 | 71° | 30° | 51° | — | — |
| 1991 | 77° | 43° | 60° | — | — |
| 1990 | 78° | 37° | 58° | — | — |
| 1989 | 79° | 36° | 57° | — | — |
| 1988 | 76° | 49° | 62° | — | — |
| 1987 | 68° | 37° | 53° | 0.05" | — |
| 1986 | 67° | 34° | 50° | — | — |
| 1985 | 71° | 33° | 52° | — | — |
| 1984coldest | 36° | 28° | 32° | 0.89" | 5" |
| 1983 | 65° | 35° | 50° | — | — |
| 1982 | 70° | 43° | 56° | — | — |
| 1981 | 49° | 40° | 44° | 0.64" | — |
| 1980 | 64° | 44° | 54° | — | — |
| 1979 | 77° | 49° | 63° | — | — |
| 1978 | 73° | 41° | 57° | — | — |
| 1977 | 70° | 39° | 54° | — | — |
| 1976 | 73° | 29° | 51° | — | — |
| 1975 | 66° | 34° | 50° | — | — |
| 1974 | 66° | 32° | 49° | — | — |
| 1973 | 74° | 46° | 60° | — | — |
| 1972 | 76° | 32° | 54° | — | — |
| 1971 | 67° | 38° | 52° | — | — |
55 years of data from BOULDER MUNI AP