Weather on May 18
Longmont, CO
55 Years of Data
Avg High
73°F
Avg Low
44°F
Warmest
1988
70°F avg
Coldest
1983
34°F avg
About This Date
May 18th in Longmont, CO typically brings pleasant spring weather, with average highs around 73°F and lows near 44°F — a 29°F daily swing. Over 54 years of records, the warmest May 18th was in 1988 (70°F average), while the coldest was 1983 (34°F) — a 36°F range across recorded history. Precipitation has occurred on 37% of recorded May 18th dates, with snow falling 4% of the time (heaviest snowfall: 5.3"). 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 May 18th in Longmont, CO? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Warming Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 70° | 47° | 58° | — | — |
| 2024 | 85° | 50° | 67° | — | — |
| 2023 | 82° | 48° | 65° | 1.14" | — |
| 2022 | 82° | 45° | 63° | 0.08" | — |
| 2021 | 66° | 47° | 56° | 2.21" | — |
| 2020 | 75° | 47° | 61° | — | — |
| 2019 | 72° | 37° | 54° | 0.51" | — |
| 2018 | 85° | 54° | 69° | — | — |
| 2017 | 60° | 31° | 45° | 7.9" | 5.3" |
| 2016 | 65° | 40° | 52° | — | — |
| 2015 | 58° | 41° | 49° | 0.38" | — |
| 2014 | 82° | 40° | 61° | — | — |
| 2013 | 80° | 61° | 70° | — | — |
| 2012 | 80° | 47° | 63° | — | — |
| 2011 | 58° | 42° | 50° | 1.8" | — |
| 2010 | 74° | 51° | 62° | — | — |
| 2008 | 82° | 47° | 64° | — | — |
| 2007 | 80° | 46° | 63° | — | — |
| 2006 | 85° | 52° | 68° | — | — |
| 2005 | 74° | 54° | 64° | — | — |
| 2004 | 71° | 54° | 62° | — | — |
| 2003 | 88° | 50° | 69° | — | — |
| 2002 | 61° | 42° | 51° | — | — |
| 2001 | 62° | 39° | 51° | 0.53" | — |
| 2000 | 64° | 40° | 52° | 2.01" | — |
| 1999 | 63° | 32° | 47° | — | — |
| 1998 | 87° | 42° | 65° | — | — |
| 1997 | 88° | 43° | 65° | — | — |
| 1996 | 85° | 52° | 68° | — | — |
| 1995 | 48° | 34° | 41° | 3.3" | — |
| 1994 | 88° | 46° | 67° | — | — |
| 1993 | 63° | 43° | 53° | 0.74" | — |
| 1992 | 83° | 44° | 63° | 0.13" | — |
| 1991 | 68° | 48° | 58° | 0.13" | — |
| 1990 | 88° | 32° | 60° | — | — |
| 1989 | 72° | 44° | 58° | — | — |
| 1988warmest | 88° | 53° | 70° | — | — |
| 1987 | 75° | 45° | 60° | 0.1" | — |
| 1986 | 71° | 40° | 55° | — | — |
| 1985 | 72° | 41° | 56° | 0.3" | — |
| 1984 | 72° | 44° | 58° | — | — |
| 1983coldest | 37° | 31° | 34° | 4.6" | 2" |
| 1982 | 71° | 41° | 56° | — | — |
| 1981 | 51° | 41° | 46° | 0.53" | — |
| 1980 | 46° | 39° | 43° | 0.89" | — |
| 1979 | 82° | 47° | 64° | — | — |
| 1978 | 70° | 38° | 54° | 3.94" | — |
| 1977 | 82° | 43° | 62° | — | — |
| 1976 | 76° | 42° | 59° | — | — |
| 1975 | 80° | 46° | 63° | — | — |
| 1974 | 70° | 52° | 61° | — | — |
| 1973 | 82° | 45° | 63° | — | — |
| 1972 | 84° | 44° | 64° | — | — |
| 1971 | 53° | 36° | 44° | 0.28" | — |
54 years of data from LONGMONT 2 ESE