Weather on October 31
Boulder, CO
55 Years of Data
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° | — | — |
Boulder, CO Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Boulder, CO Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Boulder, 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 Boulder, CO
Boulder, CO has no months that meet our "pleasant" threshold — every season has tradeoffs.