Weather on July 31
Boulder, CO
55 Years of Data
About This Date
July 31st in Boulder, CO typically brings warm summer weather, with average highs around 87°F and lows near 58°F — a 29°F daily swing. Over 55 years of records, the warmest July 31st was in 2002 (82°F average), while the coldest was 1973 (63°F) — a 19°F range across recorded history. Rain or other precipitation has occurred on about 42% of July 31st dates historically, with the wettest July 31st recording 1.45" of rain. The last decade has been 1.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.2°F warmer on this date compared to 20-30 years ago.
Planning for July 31st in Boulder, CO? Stay hydrated and seek shade during peak afternoon hours. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 82° | 59° | 71° | — | — |
| 2024 | 97° | 64° | 80° | — | — |
| 2023 | 90° | 61° | 75° | — | — |
| 2022 | 91° | 64° | 78° | — | — |
| 2021 | 73° | 61° | 67° | 0.61" | — |
| 2020 | 88° | 70° | 79° | 0.25" | — |
| 2019 | 87° | 63° | 75° | 0.03" | — |
| 2018 | 84° | 52° | 68° | — | — |
| 2017 | 88° | 54° | 71° | — | — |
| 2016 | 93° | 61° | 77° | 0.03" | — |
| 2015 | 90° | 57° | 73° | — | — |
| 2014 | 76° | 52° | 64° | 1.24" | — |
| 2013 | 91° | 55° | 73° | 0.05" | — |
| 2012 | 91° | 57° | 74° | — | — |
| 2011 | 96° | 60° | 78° | — | — |
| 2010 | 89° | 58° | 73° | — | — |
| 2009 | 80° | 47° | 63° | — | — |
| 2008 | 96° | 59° | 78° | — | — |
| 2007 | 92° | 56° | 74° | — | — |
| 2006 | 93° | 67° | 80° | — | — |
| 2005 | 89° | 62° | 76° | — | — |
| 2004 | 90° | 57° | 73° | — | — |
| 2003 | 96° | 55° | 76° | 0.84" | — |
| 2002warmest | 100° | 64° | 82° | — | — |
| 2001 | 93° | 66° | 80° | 0.05" | — |
| 2000 | 89° | 55° | 72° | — | — |
| 1999 | 76° | 55° | 65° | 1.45" | — |
| 1998 | 74° | 58° | 66° | 0.18" | — |
| 1997 | 80° | 57° | 69° | 0.36" | — |
| 1996 | 85° | 55° | 70° | — | — |
| 1995 | 83° | 52° | 67° | 0.18" | — |
| 1994 | 90° | 62° | 76° | — | — |
| 1993 | 94° | 60° | 77° | — | — |
| 1992 | 85° | 48° | 66° | 0.08" | — |
| 1991 | 90° | 58° | 74° | — | — |
| 1990 | 79° | 61° | 70° | — | — |
| 1989 | 82° | 53° | 68° | — | — |
| 1988 | 90° | 59° | 74° | — | — |
| 1987 | 90° | 64° | 77° | 0.53" | — |
| 1986 | 82° | 55° | 69° | — | — |
| 1985 | 90° | 59° | 74° | 0.2" | — |
| 1984 | 78° | 61° | 69° | 1.32" | — |
| 1983 | 88° | 53° | 70° | — | — |
| 1982 | 86° | 55° | 71° | — | — |
| 1981 | 88° | 61° | 74° | 0.28" | — |
| 1980 | 91° | 59° | 75° | 0.08" | — |
| 1979 | 84° | 52° | 68° | 1.27" | — |
| 1978 | 85° | 57° | 71° | — | — |
| 1977 | 85° | 54° | 69° | — | — |
| 1976 | 87° | 60° | 74° | — | — |
| 1975 | 85° | 56° | 70° | 0.64" | — |
| 1974 | 83° | 58° | 70° | 0.03" | — |
| 1973coldest | 79° | 48° | 63° | 0.05" | — |
| 1972 | 93° | 63° | 78° | 0.84" | — |
| 1971 | 83° | 56° | 69° | — | — |
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.