Weather on August 11
Longmont, CO
55 Years of Data
Avg High
86°F
Avg Low
55°F
Warmest
1995
80°F avg
Coldest
1979
56°F avg
About This Date
August 11th in Longmont, CO typically brings warm summer weather, with average highs around 86°F and lows near 55°F — a 31°F daily swing. Over 55 years of records, the warmest August 11th was in 1995 (80°F average), while the coldest was 1979 (56°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 24% of August 11th dates historically, with the wettest August 11th recording 1.98" of rain. The last decade has been 2.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.1°F warmer on this date compared to 20-30 years ago.
Planning for August 11th in Longmont, CO? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 78° | 54° | 66° | 1.45" | — |
| 2024 | 79° | 59° | 69° | 0.18" | — |
| 2023 | 87° | 58° | 72° | — | — |
| 2022 | 95° | 64° | 80° | — | — |
| 2021 | 91° | 57° | 74° | — | — |
| 2020 | 87° | 58° | 72° | — | — |
| 2019 | 84° | 63° | 73° | — | — |
| 2018 | 90° | 56° | 73° | — | — |
| 2017 | 77° | 51° | 64° | 0.03" | — |
| 2016 | 88° | 60° | 74° | — | — |
| 2015 | 83° | 61° | 72° | — | — |
| 2014 | 85° | 52° | 68° | — | — |
| 2013 | 83° | 55° | 69° | — | — |
| 2012 | 90° | 67° | 78° | — | — |
| 2011 | 93° | 52° | 72° | — | — |
| 2010 | 92° | 56° | 74° | — | — |
| 2009 | 89° | 52° | 70° | — | — |
| 2008 | 86° | 52° | 69° | 0.1" | — |
| 2007 | 93° | 61° | 77° | — | — |
| 2006 | 94° | 62° | 78° | — | — |
| 2005 | 80° | 57° | 69° | 0.18" | — |
| 2004 | 86° | 55° | 71° | 0.38" | — |
| 2003 | 93° | 58° | 75° | — | — |
| 2002 | 93° | 53° | 73° | — | — |
| 2001 | 81° | 52° | 66° | 0.1" | — |
| 2000 | 91° | 56° | 73° | — | — |
| 1999 | 85° | 51° | 68° | 0.05" | — |
| 1998 | 83° | 54° | 68° | — | — |
| 1997 | 66° | 50° | 58° | 0.1" | — |
| 1996 | 92° | 58° | 75° | — | — |
| 1995warmest | 99° | 62° | 80° | — | — |
| 1994 | 91° | 56° | 73° | 1.98" | — |
| 1993 | 85° | 51° | 68° | — | — |
| 1992 | 84° | 51° | 68° | — | — |
| 1991 | 82° | 54° | 68° | — | — |
| 1990 | 92° | 54° | 73° | — | — |
| 1989 | 91° | 57° | 74° | — | — |
| 1988 | 94° | 50° | 72° | — | — |
| 1987 | 90° | 55° | 72° | — | — |
| 1986 | 84° | 52° | 68° | — | — |
| 1985 | 87° | 59° | 73° | 0.08" | — |
| 1984 | 89° | 52° | 70° | — | — |
| 1983 | 95° | 59° | 77° | — | — |
| 1982 | 77° | 56° | 66° | 0.15" | — |
| 1981 | 66° | 53° | 60° | — | — |
| 1980 | 86° | 61° | 73° | — | — |
| 1979coldest | 65° | 47° | 56° | 0.05" | — |
| 1978 | 90° | 57° | 73° | — | — |
| 1977 | 81° | 50° | 65° | — | — |
| 1976 | 89° | 52° | 70° | — | — |
| 1975 | 92° | 53° | 72° | — | — |
| 1974 | 75° | 46° | 61° | — | — |
| 1973 | 95° | 57° | 76° | — | — |
| 1972 | 93° | 58° | 75° | — | — |
| 1971 | 89° | 54° | 71° | — | — |
55 years of data from LONGMONT 2 ESE