Weather on August 17
Boulder, CO
55 Years of Data
Avg High
86°F
Avg Low
56°F
Warmest
1973
80°F avg
Coldest
2008
58°F avg
About This Date
August 17th in Boulder, CO typically brings warm summer weather, with average highs around 86°F and lows near 56°F — a 30°F daily swing. Over 55 years of records, the warmest August 17th was in 1973 (80°F average), while the coldest was 2008 (58°F) — a 22°F range across recorded history. Rain or other precipitation has occurred on about 36% of August 17th dates historically, with the wettest August 17th recording 2.24" of rain. The last decade has been 4.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.7°F warmer on this date compared to 20-30 years ago.
Planning for August 17th in Boulder, CO? Stay hydrated and seek shade during peak afternoon hours. Consider bringing rain gear or an umbrella.
Warming Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 91° | 64° | 78° | — | — |
| 2024 | 97° | 59° | 78° | — | — |
| 2023 | 90° | 63° | 76° | — | — |
| 2022 | 82° | 57° | 70° | — | — |
| 2021 | 95° | 61° | 78° | — | — |
| 2020 | 93° | 61° | 77° | — | — |
| 2019 | 90° | 59° | 74° | — | — |
| 2018 | 86° | 61° | 73° | — | — |
| 2017 | 86° | 50° | 68° | 0.03" | — |
| 2016 | 90° | 54° | 72° | 0.71" | — |
| 2015 | 76° | 56° | 66° | 0.03" | — |
| 2014 | 92° | 58° | 75° | — | — |
| 2013 | 92° | 55° | 73° | — | — |
| 2012 | 84° | 46° | 65° | — | — |
| 2011 | 90° | 53° | 71° | — | — |
| 2010 | 85° | 50° | 67° | — | — |
| 2009 | 75° | 46° | 61° | 0.28" | — |
| 2008coldest | 71° | 45° | 58° | 0.97" | — |
| 2007 | 87° | 58° | 72° | 0.38" | — |
| 2006 | 90° | 57° | 73° | — | — |
| 2005 | 86° | 55° | 71° | — | — |
| 2004 | 85° | 52° | 68° | — | — |
| 2003 | 85° | 65° | 75° | — | — |
| 2002 | 92° | 47° | 69° | — | — |
| 2001 | 83° | 50° | 66° | 0.05" | — |
| 2000 | 75° | 60° | 68° | 0.15" | — |
| 1999 | 85° | 60° | 72° | 0.81" | — |
| 1998 | 91° | 56° | 73° | — | — |
| 1997 | 75° | 55° | 65° | 2.24" | — |
| 1996 | 88° | 52° | 70° | — | — |
| 1995 | 89° | 62° | 76° | — | — |
| 1994 | 87° | 57° | 72° | — | — |
| 1993 | 93° | 50° | 72° | — | — |
| 1992 | 73° | 50° | 62° | 0.38" | — |
| 1991 | 80° | 54° | 67° | — | — |
| 1990 | 80° | 57° | 69° | 0.05" | — |
| 1989 | 85° | 49° | 67° | — | — |
| 1988 | 76° | 55° | 65° | 0.03" | — |
| 1987 | 91° | 53° | 72° | — | — |
| 1986 | 89° | 57° | 73° | — | — |
| 1985 | 79° | 48° | 63° | — | — |
| 1984 | 88° | 61° | 74° | 0.03" | — |
| 1983 | 91° | 63° | 77° | — | — |
| 1982 | 84° | 58° | 71° | 0.08" | — |
| 1981 | 80° | 50° | 65° | 0.48" | — |
| 1980 | 88° | 50° | 69° | — | — |
| 1979 | 76° | 57° | 66° | — | — |
| 1978 | 93° | 50° | 72° | — | — |
| 1977 | 72° | 58° | 65° | 0.08" | — |
| 1976 | 88° | 59° | 73° | — | — |
| 1975 | 84° | 54° | 69° | 0.03" | — |
| 1974 | 89° | 58° | 73° | — | — |
| 1973warmest | 93° | 67° | 80° | 0.03" | — |
| 1972 | 87° | 53° | 70° | 0.43" | — |
| 1971 | 90° | 59° | 74° | — | — |
55 years of data from BOULDER MUNI AP