Weather on October 4
Longmont, CO
55 Years of Data
Avg High
70°F
Avg Low
39°F
Warmest
2025
67°F avg
Coldest
1999
37°F avg
About This Date
October 4th in Longmont, CO typically brings pleasant fall weather, with average highs around 70°F and lows near 39°F — a 31°F daily swing. Over 55 years of records, the warmest October 4th was in 2025 (67°F average), while the coldest was 1999 (37°F) — a 30°F range across recorded history. Precipitation has occurred on 22% of recorded October 4th dates, with snow falling 2% of the time. The last decade has been 4.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.3°F warmer on this date compared to 20-30 years ago.
Planning for October 4th in Longmont, CO? Great weather for outdoor activities.
Warming Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025warmest | 86° | 48° | 67° | — | — |
| 2024 | 68° | 41° | 55° | — | — |
| 2023 | 69° | 46° | 58° | — | — |
| 2022 | 73° | 44° | 59° | 0.71" | — |
| 2021 | 80° | 41° | 61° | — | — |
| 2020 | 68° | 39° | 54° | — | — |
| 2019 | 65° | 38° | 51° | — | — |
| 2018 | 86° | 45° | 65° | 0.15" | — |
| 2017 | 57° | 34° | 45° | 0.05" | — |
| 2016 | 65° | 46° | 55° | — | — |
| 2015 | 57° | 47° | 52° | 0.3" | — |
| 2014 | 73° | 35° | 54° | — | — |
| 2013 | 56° | 32° | 44° | 2.59" | 0.7" |
| 2012 | 59° | 37° | 48° | — | — |
| 2011 | 82° | 49° | 65° | — | — |
| 2010 | 76° | 45° | 60° | 0.08" | — |
| 2009 | 54° | 37° | 45° | 0.03" | — |
| 2008 | 69° | 46° | 58° | — | — |
| 2007 | 82° | 48° | 65° | — | — |
| 2006 | 68° | 41° | 55° | — | — |
| 2005 | 69° | 43° | 56° | 0.28" | — |
| 2004 | 76° | 40° | 58° | — | — |
| 2003 | 71° | 39° | 55° | — | — |
| 2002 | 54° | 31° | 42° | — | — |
| 2001 | 82° | 37° | 60° | — | — |
| 2000 | 77° | 40° | 58° | — | — |
| 1999coldest | 52° | 22° | 37° | — | — |
| 1998 | 54° | 39° | 46° | 0.64" | — |
| 1997 | 79° | 36° | 57° | — | — |
| 1996 | 70° | 46° | 58° | — | — |
| 1995 | 74° | 34° | 54° | — | — |
| 1994 | 57° | 48° | 53° | — | — |
| 1993 | 83° | 38° | 60° | — | — |
| 1992 | 85° | 40° | 62° | — | — |
| 1991 | 82° | 31° | 56° | 0.18" | — |
| 1990 | 62° | 40° | 51° | — | — |
| 1989 | 57° | 35° | 46° | — | — |
| 1988 | 72° | 36° | 54° | — | — |
| 1987 | — | 40° | — | — | — |
| 1986 | 45° | 33° | 39° | 0.64" | — |
| 1985 | 58° | 32° | 45° | — | — |
| 1984 | 71° | 43° | 57° | 1.09" | — |
| 1983 | 72° | 36° | 54° | — | — |
| 1982 | 75° | 36° | 55° | — | — |
| 1981 | 75° | 43° | 59° | — | — |
| 1980 | 82° | — | — | — | — |
| 1979 | 65° | 31° | 48° | — | — |
| 1978 | 68° | 34° | 51° | — | — |
| 1977 | 79° | 37° | 58° | — | — |
| 1976 | 74° | 44° | 59° | — | — |
| 1975 | 83° | 37° | 60° | — | — |
| 1974 | 84° | 43° | 63° | — | — |
| 1973 | 51° | 30° | 41° | — | — |
| 1972 | 75° | 42° | 59° | — | — |
| 1971 | 64° | 32° | 48° | — | — |
55 years of data from LONGMONT 2 ESE