Weather on August 20
Longmont, CO
55 Years of Data
Avg High
86°F
Avg Low
54°F
Warmest
2007
79°F avg
Coldest
2004
59°F avg
About This Date
August 20th in Longmont, CO typically brings warm summer weather, with average highs around 86°F and lows near 54°F — a 32°F daily swing. Over 55 years of records, the warmest August 20th was in 2007 (79°F average), while the coldest was 2004 (59°F) — a 20°F range across recorded history. Rain or other precipitation has occurred on about 22% of August 20th dates historically, with the wettest August 20th recording 2.18" of rain. The last decade has been 2.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.0°F warmer on this date compared to 20-30 years ago.
Planning for August 20th in Longmont, CO? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 92° | 58° | 75° | — | — |
| 2024 | 87° | 59° | 73° | 0.08" | — |
| 2023 | 93° | 61° | 77° | 0.18" | — |
| 2022 | 84° | 58° | 71° | — | — |
| 2021 | 78° | 49° | 63° | 2.03" | — |
| 2020 | 92° | 57° | 74° | — | — |
| 2019 | 96° | 58° | 77° | — | — |
| 2018 | 73° | 49° | 61° | 0.03" | — |
| 2017 | 89° | 61° | 75° | — | — |
| 2016 | 76° | 43° | 59° | — | — |
| 2015 | 89° | 47° | 68° | — | — |
| 2014 | 89° | 57° | 73° | 0.03" | — |
| 2013 | 97° | 61° | 79° | — | — |
| 2012 | 84° | 52° | 68° | — | — |
| 2011 | 86° | 53° | 70° | 0.38" | — |
| 2010 | 87° | 58° | 72° | 0.08" | — |
| 2009 | 82° | 48° | 65° | — | — |
| 2008 | 85° | 51° | 68° | — | — |
| 2007warmest | 96° | 63° | 79° | — | — |
| 2006 | 84° | 53° | 69° | — | — |
| 2005 | 85° | 54° | 69° | 0.03" | — |
| 2004coldest | 69° | 48° | 59° | — | — |
| 2003 | 85° | 54° | 69° | — | — |
| 2002 | 86° | 56° | 71° | — | — |
| 2001 | 97° | 53° | 75° | — | — |
| 2000 | 91° | 55° | 73° | — | — |
| 1999 | 91° | 47° | 69° | 0.13" | — |
| 1998 | 92° | 54° | 73° | — | — |
| 1997 | 79° | 51° | 65° | — | — |
| 1996 | 79° | 45° | 62° | — | — |
| 1995 | 85° | 57° | 71° | — | — |
| 1994 | 84° | 51° | 68° | — | — |
| 1993 | 88° | 55° | 71° | — | — |
| 1992 | 90° | 50° | 70° | — | — |
| 1991 | 85° | 52° | 68° | — | — |
| 1990 | 83° | 51° | 67° | — | — |
| 1989 | 76° | 48° | 62° | 0.41" | — |
| 1988 | 89° | 51° | 70° | — | — |
| 1987 | 95° | 53° | 74° | — | — |
| 1986 | 97° | 58° | 77° | — | — |
| 1985 | 92° | 53° | 72° | — | — |
| 1984 | 82° | 58° | 70° | — | — |
| 1983 | 90° | 59° | 74° | — | — |
| 1982 | 90° | 62° | 76° | — | — |
| 1981 | 88° | 61° | 74° | — | — |
| 1980 | 90° | 53° | 71° | — | — |
| 1979 | 75° | 48° | 62° | 2.18" | — |
| 1978 | 84° | 49° | 66° | — | — |
| 1977 | 73° | 52° | 62° | 0.13" | — |
| 1976 | 85° | 54° | 69° | — | — |
| 1975 | 89° | 54° | 71° | — | — |
| 1974 | 92° | 60° | 76° | — | — |
| 1973 | 93° | 57° | 75° | — | — |
| 1972 | 84° | 58° | 71° | — | — |
| 1971 | 83° | 56° | 69° | — | — |
55 years of data from LONGMONT 2 ESE