Weather on April 18
Boulder, CO
55 Years of Data
Avg High
64°F
Avg Low
37°F
Warmest
1987
67°F avg
Coldest
2013
22°F avg
About This Date
April 18th in Boulder, CO typically brings mild spring weather, with average highs around 64°F and lows near 37°F — a 27°F daily swing. Over 55 years of records, the warmest April 18th was in 1987 (67°F average), while the coldest was 2013 (22°F) — a 45°F range across recorded history. Precipitation has occurred on 29% of recorded April 18th dates, with snow falling 11% of the time (heaviest snowfall: 8.2"). The last decade has been 9.8°F cooler on this date compared to 20-30 years ago.
The last decade has been 9.8°F cooler on this date compared to 20-30 years ago.
Planning for April 18th in Boulder, CO? Great weather for outdoor activities.
Cooling Trend
1.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 32° | 30° | 31° | — | — |
| 2024 | 36° | 32° | 34° | — | — |
| 2023 | 77° | 43° | 60° | — | — |
| 2022 | 59° | 30° | 45° | — | — |
| 2021 | 57° | 34° | 45° | — | — |
| 2020 | 52° | 28° | 40° | — | — |
| 2019 | 63° | 36° | 49° | — | — |
| 2018 | 55° | 34° | 44° | — | — |
| 2017 | 77° | 42° | 60° | — | — |
| 2016 | 44° | 31° | 37° | 0.03" | 0.1" |
| 2015 | 54° | 36° | 45° | 0.05" | — |
| 2014 | 76° | 38° | 57° | — | — |
| 2013coldest | 33° | 10° | 22° | 0.08" | 1.1" |
| 2012 | 70° | 37° | 53° | — | — |
| 2011 | 65° | 40° | 52° | — | — |
| 2010 | 69° | 34° | 51° | — | — |
| 2009 | 42° | 32° | 37° | 2.9" | 1.8" |
| 2008 | 68° | 29° | 48° | — | — |
| 2007 | 64° | 34° | 49° | — | — |
| 2006 | 75° | 37° | 56° | — | — |
| 2005 | 75° | 40° | 57° | — | — |
| 2004 | 69° | 50° | 60° | — | — |
| 2003 | 63° | 41° | 52° | 0.08" | — |
| 2002 | 70° | 31° | 50° | — | — |
| 2001 | 79° | 39° | 59° | — | — |
| 2000 | 79° | 46° | 62° | — | — |
| 1999 | 70° | 38° | 54° | — | — |
| 1998 | 45° | 30° | 37° | 1.47" | 5.7" |
| 1997 | 73° | 44° | 59° | — | — |
| 1996 | 64° | 43° | 53° | 0.03" | — |
| 1995 | 52° | 26° | 39° | 0.81" | 1.3" |
| 1994 | 77° | 41° | 59° | — | — |
| 1993 | 68° | 44° | 56° | 0.15" | — |
| 1992 | 68° | 42° | 55° | 0.1" | — |
| 1991 | 57° | 40° | 48° | 0.23" | — |
| 1990 | 66° | 32° | 49° | — | — |
| 1989 | 67° | 33° | 50° | — | — |
| 1988 | 72° | 33° | 52° | 0.2" | — |
| 1987warmest | 84° | 50° | 67° | — | — |
| 1986 | 53° | 33° | 43° | — | — |
| 1985 | 78° | 51° | 65° | — | — |
| 1984 | 61° | 41° | 51° | — | — |
| 1983 | 70° | 34° | 52° | — | — |
| 1982 | 71° | 42° | 57° | — | — |
| 1981 | 73° | 44° | 59° | — | — |
| 1980 | 79° | 37° | 58° | — | — |
| 1979 | 81° | 46° | 63° | — | — |
| 1978 | 58° | 34° | 46° | — | — |
| 1977 | 63° | 35° | 49° | 0.1" | — |
| 1976 | 54° | 27° | 40° | — | — |
| 1975 | 55° | 25° | 40° | 2.46" | 8.2" |
| 1974 | 71° | 35° | 53° | — | — |
| 1973 | 63° | 39° | 51° | 0.08" | — |
| 1972 | 70° | 35° | 52° | 0.3" | — |
| 1971 | 73° | 42° | 58° | — | — |
55 years of data from BOULDER MUNI AP