Weather on August 17
Longmont, CO
55 Years of Data
Avg High
87°F
Avg Low
53°F
Warmest
1995
78°F avg
Coldest
2008
58°F avg
About This Date
August 17th in Longmont, CO typically brings warm summer weather, with average highs around 87°F and lows near 53°F — a 34°F daily swing. Over 55 years of records, the warmest August 17th was in 1995 (78°F average), while the coldest was 2008 (58°F) — a 20°F range across recorded history. Rain or other precipitation has occurred on about 31% of August 17th dates historically, with the wettest August 17th recording 4.19" of rain. The last decade has been 1.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.8°F warmer on this date compared to 20-30 years ago.
Planning for August 17th in Longmont, CO? Stay hydrated and seek shade during peak afternoon hours. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 87° | 58° | 72° | — | — |
| 2024 | 91° | 56° | 73° | — | — |
| 2023 | 96° | 59° | 78° | — | — |
| 2022 | 73° | 59° | 66° | 0.25" | — |
| 2021 | 91° | 56° | 73° | — | — |
| 2020 | 94° | 59° | 76° | — | — |
| 2019 | 82° | 55° | 69° | — | — |
| 2018 | 84° | 56° | 70° | — | — |
| 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 | 87° | 55° | 71° | — | — |
| 2003 | 91° | 58° | 74° | — | — |
| 2002 | 104° | 45° | 74° | — | — |
| 2001 | 80° | 42° | 61° | 0.05" | — |
| 2000 | 91° | 58° | 74° | 0.36" | — |
| 1999 | 92° | 50° | 71° | — | — |
| 1998 | 92° | 49° | 70° | — | — |
| 1997 | 79° | 54° | 66° | 0.15" | — |
| 1996 | 82° | 51° | 67° | — | — |
| 1995warmest | 99° | 57° | 78° | — | — |
| 1994 | 97° | 56° | 76° | — | — |
| 1993 | 93° | 50° | 72° | — | — |
| 1992 | 79° | 50° | 64° | — | — |
| 1991 | 86° | 54° | 70° | 0.51" | — |
| 1990 | 88° | 53° | 70° | 4.19" | — |
| 1989 | 85° | 49° | 67° | — | — |
| 1988 | 90° | 53° | 71° | 1.4" | — |
| 1987 | 92° | 54° | 73° | — | — |
| 1986 | 95° | 55° | 75° | — | — |
| 1985 | 74° | 50° | 62° | — | — |
| 1984 | 91° | 58° | 74° | — | — |
| 1983 | 97° | 58° | 77° | — | — |
| 1982 | 92° | 59° | 75° | 2.16" | — |
| 1981 | 83° | 50° | 66° | — | — |
| 1980 | 85° | 49° | 67° | — | — |
| 1979 | 82° | 50° | 66° | 2.29" | — |
| 1978 | 91° | 51° | 71° | — | — |
| 1977 | 75° | 60° | 68° | — | — |
| 1976 | 88° | 55° | 71° | — | — |
| 1975 | 77° | 50° | 64° | 0.25" | — |
| 1974 | 88° | 52° | 70° | — | — |
| 1973 | 95° | 59° | 77° | — | — |
| 1972 | 86° | 52° | 69° | 0.2" | — |
| 1971 | 90° | 55° | 72° | — | — |
55 years of data from LONGMONT 2 ESE