Weather on August 13
Boulder, CO
55 Years of Data
Avg High
85°F
Avg Low
56°F
Warmest
2025
81°F avg
Coldest
1979
60°F avg
About This Date
August 13th in Boulder, CO typically brings warm summer weather, with average highs around 85°F and lows near 56°F — a 29°F daily swing. Over 55 years of records, the warmest August 13th was in 2025 (81°F average), while the coldest was 1979 (60°F) — a 21°F range across recorded history. Rain or other precipitation has occurred on about 25% of August 13th dates historically, with the wettest August 13th recording 2.08" of rain. The last decade has been 4.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.9°F warmer on this date compared to 20-30 years ago.
Planning for August 13th in Boulder, CO? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025warmest | 102° | 59° | 81° | — | — |
| 2024 | 86° | 61° | 73° | — | — |
| 2023 | 77° | 61° | 69° | — | — |
| 2022 | 88° | 66° | 77° | — | — |
| 2021 | 82° | 61° | 71° | — | — |
| 2020 | 95° | 59° | 77° | — | — |
| 2019 | 88° | 59° | 73° | — | — |
| 2018 | 86° | 55° | 71° | — | — |
| 2017 | 85° | 55° | 70° | 0.08" | — |
| 2016 | 88° | 51° | 69° | — | — |
| 2015 | 94° | 61° | 77° | 0.03" | — |
| 2014 | 90° | 58° | 74° | — | — |
| 2013 | 78° | 51° | 65° | 0.69" | — |
| 2012 | 83° | 57° | 70° | — | — |
| 2011 | 85° | 53° | 69° | — | — |
| 2010 | 86° | 66° | 76° | — | — |
| 2009 | 91° | 54° | 72° | — | — |
| 2008 | 91° | 56° | 73° | — | — |
| 2007 | 97° | 62° | 79° | — | — |
| 2006 | 84° | 58° | 71° | — | — |
| 2005 | 74° | 54° | 64° | 0.05" | — |
| 2004 | 80° | 44° | 62° | — | — |
| 2003 | 91° | 59° | 75° | — | — |
| 2002 | 75° | 44° | 60° | — | — |
| 2001 | 81° | 56° | 68° | — | — |
| 2000 | 92° | 57° | 74° | — | — |
| 1999 | 82° | 50° | 66° | — | — |
| 1998 | 86° | 53° | 70° | — | — |
| 1997 | 83° | 50° | 66° | — | — |
| 1996 | 95° | 59° | 77° | — | — |
| 1995 | 92° | 66° | 79° | — | — |
| 1994 | 81° | 61° | 71° | 0.1" | — |
| 1993 | 80° | 54° | 67° | — | — |
| 1992 | 79° | 48° | 63° | — | — |
| 1991 | 74° | 52° | 63° | 0.15" | — |
| 1990 | 78° | 48° | 63° | — | — |
| 1989 | 87° | 54° | 70° | 0.69" | — |
| 1988 | 91° | 63° | 77° | — | — |
| 1987 | 76° | 52° | 64° | 0.03" | — |
| 1986 | 89° | 63° | 76° | — | — |
| 1985 | 81° | 49° | 65° | — | — |
| 1984 | 90° | 52° | 71° | — | — |
| 1983 | 80° | 63° | 71° | 0.2" | — |
| 1982 | 79° | 59° | 69° | 0.18" | — |
| 1981 | 78° | 53° | 66° | 0.25" | — |
| 1980 | 85° | 58° | 71° | — | — |
| 1979coldest | 65° | 55° | 60° | — | — |
| 1978 | 90° | 55° | 72° | 0.3" | — |
| 1977 | 84° | 56° | 70° | — | — |
| 1976 | 85° | 54° | 69° | — | — |
| 1975 | 79° | 56° | 67° | 2.08" | — |
| 1974 | 84° | 56° | 70° | 0.03" | — |
| 1973 | 83° | 61° | 72° | — | — |
| 1972 | 94° | 62° | 78° | — | — |
| 1971 | 88° | 58° | 73° | — | — |
55 years of data from BOULDER MUNI AP