Weather on June 18
Boulder, CO
55 Years of Data
About This Date
June 18th in Boulder, CO typically brings warm summer weather, with average highs around 82°F and lows near 53°F — a 29°F daily swing. Over 55 years of records, the warmest June 18th was in 2012 (81°F average), while the coldest was 1976 (50°F) — a 31°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 4.8" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for June 18th in Boulder, CO? Stay hydrated and seek shade during peak afternoon hours. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 82° | 48° | 65° | — | — |
| 2024 | 73° | 57° | 65° | — | — |
| 2023 | 82° | 52° | 67° | — | — |
| 2022 | 90° | 63° | 76° | — | — |
| 2021 | 90° | 64° | 77° | — | — |
| 2020 | 68° | 52° | 60° | — | — |
| 2019 | 72° | 55° | 63° | — | — |
| 2018 | 72° | 54° | 63° | — | — |
| 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 | 53° | 46° | 50° | 2.82" | — |
| 2003 | 72° | 52° | 62° | 0.71" | — |
| 2002 | 94° | 60° | 77° | — | — |
| 2001 | 92° | 69° | 80° | — | — |
| 2000 | 76° | 69° | 72° | 0.05" | — |
| 1999 | 81° | 48° | 64° | — | — |
| 1998 | 74° | 46° | 60° | — | — |
| 1997 | 86° | 52° | 69° | 0.03" | — |
| 1996 | 89° | 53° | 71° | — | — |
| 1995 | 77° | 45° | 61° | 0.56" | — |
| 1994 | 82° | 58° | 70° | 0.33" | — |
| 1993 | 54° | 46° | 50° | 4.8" | — |
| 1992 | 83° | 47° | 65° | — | — |
| 1991 | 84° | 53° | 69° | — | — |
| 1990 | 95° | 51° | 73° | — | — |
| 1989 | 90° | 50° | 70° | — | — |
| 1988 | 91° | 58° | 74° | — | — |
| 1987 | 81° | 54° | 67° | 0.15" | — |
| 1986 | 87° | 51° | 69° | — | — |
| 1985 | 73° | 50° | 62° | — | — |
| 1984 | 79° | 52° | 65° | 0.1" | — |
| 1983 | 93° | 49° | 71° | — | — |
| 1982 | 63° | 48° | 55° | 2.11" | — |
| 1981 | 80° | 45° | 62° | — | — |
| 1980 | 93° | 56° | 74° | — | — |
| 1979 | 77° | 57° | 67° | 0.18" | — |
| 1978 | 85° | 48° | 66° | — | — |
| 1977 | 79° | 56° | 67° | 0.13" | — |
| 1976coldest | 57° | 43° | 50° | 2.13" | — |
| 1975 | 66° | 51° | 59° | 0.15" | — |
| 1974 | 90° | 57° | 73° | — | — |
| 1973 | 85° | 47° | 66° | — | — |
| 1972 | 81° | 57° | 69° | 0.1" | — |
| 1971 | 90° | 56° | 73° | — | — |