Weather on June 18
Longmont, CO
55 Years of Data
Avg High
83°F
Avg Low
51°F
Warmest
2012
81°F avg
Coldest
1993
51°F avg
About This Date
June 18th in Longmont, CO typically brings warm summer weather, with average highs around 83°F and lows near 51°F — a 32°F daily swing. Over 55 years of records, the warmest June 18th was in 2012 (81°F average), while the coldest was 1993 (51°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 33% of June 18th dates historically, with the wettest June 18th recording 3.18" of rain. The last decade has been 4.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.2°F warmer on this date compared to 20-30 years ago.
Planning for June 18th in Longmont, CO? Stay hydrated and seek shade during peak afternoon hours. Consider bringing rain gear or an umbrella.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 71° | 48° | 60° | 0.51" | — |
| 2024 | 88° | 55° | 71° | — | — |
| 2023 | 74° | 47° | 60° | — | — |
| 2022 | 93° | 61° | 77° | — | — |
| 2021 | 98° | 61° | 79° | — | — |
| 2020 | 92° | 51° | 71° | — | — |
| 2019 | 74° | 55° | 64° | 0.51" | — |
| 2018 | 69° | 55° | 62° | 0.51" | — |
| 2017 | 85° | 53° | 69° | — | — |
| 2016 | 91° | 58° | 74° | — | — |
| 2015 | 80° | 54° | 67° | 0.03" | — |
| 2014 | 86° | 51° | 69° | 0.38" | — |
| 2013 | 82° | 51° | 67° | — | — |
| 2012warmest | 98° | 65° | 81° | — | — |
| 2011 | 84° | 49° | 66° | — | — |
| 2010 | 81° | 49° | 65° | — | — |
| 2009 | 80° | 51° | 66° | 0.03" | — |
| 2008 | 86° | 53° | 70° | — | — |
| 2007 | 92° | 54° | 73° | — | — |
| 2006 | 93° | 57° | 75° | — | — |
| 2005 | 87° | 54° | 70° | — | — |
| 2004 | 60° | 48° | 54° | 1.91" | — |
| 2003 | 80° | 55° | 68° | 0.69" | — |
| 2002 | 97° | 49° | 73° | — | — |
| 2001 | 97° | 48° | 72° | — | — |
| 2000 | 66° | 40° | 53° | 0.05" | — |
| 1999 | 82° | 44° | 63° | — | — |
| 1998 | 67° | 47° | 57° | 0.23" | — |
| 1997 | 80° | 48° | 64° | — | — |
| 1996 | 89° | 54° | 71° | — | — |
| 1995 | 81° | 46° | 63° | 1.42" | — |
| 1994 | 85° | 57° | 71° | — | — |
| 1993coldest | 58° | 45° | 51° | 3.18" | — |
| 1992 | 83° | 45° | 64° | — | — |
| 1991 | 92° | 53° | 72° | — | — |
| 1990 | 86° | 51° | 69° | — | — |
| 1989 | 83° | 47° | 65° | — | — |
| 1988 | 89° | 48° | 69° | — | — |
| 1987 | 90° | 56° | 73° | 1.37" | — |
| 1986 | 91° | 53° | 72° | — | — |
| 1985 | 73° | 54° | 63° | — | — |
| 1984 | 79° | 40° | 59° | — | — |
| 1983 | 80° | 52° | 66° | — | — |
| 1982 | 73° | 50° | 62° | 2.44" | — |
| 1981 | 90° | 46° | 68° | — | — |
| 1980 | 88° | 54° | 71° | — | — |
| 1979 | 77° | 57° | 67° | 0.18" | — |
| 1978 | 88° | 56° | 72° | — | — |
| 1977 | 83° | 57° | 70° | 0.33" | — |
| 1976 | 60° | 44° | 52° | 1.65" | — |
| 1975 | 71° | 50° | 61° | — | — |
| 1974 | 89° | 52° | 70° | 0.03" | — |
| 1973 | 88° | 46° | 67° | — | — |
| 1972 | 83° | 54° | 68° | — | — |
| 1971 | 94° | 52° | 73° | — | — |
55 years of data from LONGMONT 2 ESE