Weather on October 31
Boulder, CO
55 Years of Data
Avg High
56°F
Avg Low
32°F
Warmest
2016
65°F avg
Coldest
2002
18°F avg
About This Date
October 31st in Boulder, CO typically brings cool fall weather, with average highs around 56°F and lows near 32°F. Over 55 years of records, the warmest October 31st was in 2016 (65°F average), while the coldest was 2002 (18°F) — a 47°F range across recorded history. Precipitation has occurred on 33% of recorded October 31st dates, with snow falling 11% of the time (heaviest snowfall: 2.1"). The last decade has been 2.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.3°F warmer on this date compared to 20-30 years ago.
Planning for October 31st in Boulder, CO? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 50° | 32° | 41° | — | — |
| 2024 | 54° | 28° | 41° | — | — |
| 2023 | 50° | 23° | 37° | — | — |
| 2022 | 68° | 36° | 52° | — | — |
| 2021 | 45° | 36° | 40° | — | — |
| 2020 | 63° | 37° | 50° | — | — |
| 2019 | 37° | 10° | 24° | — | — |
| 2018 | 48° | 34° | 41° | — | — |
| 2017 | 52° | 26° | 39° | 0.05" | 0.2" |
| 2016warmest | 78° | 52° | 65° | — | — |
| 2015 | 67° | 34° | 50° | — | — |
| 2014 | 57° | 29° | 43° | — | — |
| 2013 | 55° | 29° | 42° | — | — |
| 2012 | 71° | 40° | 55° | — | — |
| 2011 | 73° | 35° | 54° | — | — |
| 2010 | 65° | 38° | 51° | — | — |
| 2009 | 61° | 38° | 49° | — | — |
| 2008 | 75° | 40° | 57° | — | — |
| 2007 | 64° | 33° | 49° | 0.15" | — |
| 2006 | 39° | 23° | 31° | — | — |
| 2005 | 57° | 28° | 43° | 0.1" | — |
| 2004 | 53° | 32° | 43° | — | — |
| 2003 | 28° | 23° | 26° | 0.58" | 0.2" |
| 2002coldest | 21° | 15° | 18° | 0.28" | 2.1" |
| 2001 | 71° | 54° | 62° | — | — |
| 2000 | 49° | 33° | 41° | 0.25" | — |
| 1999 | 74° | 33° | 53° | — | — |
| 1998 | 40° | 34° | 37° | 0.43" | — |
| 1997 | 60° | 45° | 52° | 0.18" | — |
| 1996 | 35° | 29° | 32° | 0.08" | — |
| 1995 | 50° | 31° | 40° | — | — |
| 1994 | 59° | 25° | 42° | — | — |
| 1993 | 54° | 24° | 39° | — | — |
| 1992 | 54° | 36° | 45° | 0.33" | — |
| 1991 | 35° | 5° | 20° | 0.03" | 0.3" |
| 1990 | 72° | 51° | 61° | — | — |
| 1989 | 52° | 23° | 37° | — | — |
| 1988 | 73° | 37° | 55° | — | — |
| 1987 | 63° | 44° | 53° | 0.48" | — |
| 1986 | 65° | 33° | 49° | 1.3" | — |
| 1985 | 61° | 41° | 51° | 0.25" | — |
| 1984 | 68° | 26° | 47° | — | — |
| 1983 | 74° | 43° | 58° | 0.15" | — |
| 1982 | 60° | 37° | 49° | 0.05" | — |
| 1981 | 50° | 28° | 39° | 0.64" | 1" |
| 1980 | 66° | 39° | 53° | — | — |
| 1979 | 38° | 19° | 28° | — | — |
| 1978 | 58° | 30° | 44° | — | — |
| 1977 | 55° | 42° | 49° | — | — |
| 1976 | 61° | 28° | 44° | — | — |
| 1975 | 62° | 43° | 52° | — | — |
| 1974 | 52° | 34° | 43° | — | — |
| 1973 | 57° | 39° | 48° | — | — |
| 1972 | 36° | 12° | 24° | 0.13" | 0.8" |
| 1971 | 46° | 26° | 36° | — | — |
55 years of data from BOULDER MUNI AP