Weather on September 13
Longmont, CO
55 Years of Data
Avg High
79°F
Avg Low
46°F
Warmest
1994
73°F avg
Coldest
1989
35°F avg
About This Date
September 13th in Longmont, CO typically brings pleasant fall weather, with average highs around 79°F and lows near 46°F — a 33°F daily swing. Over 55 years of records, the warmest September 13th was in 1994 (73°F average), while the coldest was 1989 (35°F) — a 38°F range across recorded history. Precipitation has occurred on 24% of recorded September 13th dates, with snow falling 2% of the time. The last decade has been 2.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.0°F warmer on this date compared to 20-30 years ago.
Planning for September 13th in Longmont, CO? Great weather for outdoor activities.
Warming Trend
1.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 81° | 54° | 67° | 0.08" | — |
| 2024 | 90° | 50° | 70° | — | — |
| 2023 | 74° | 48° | 61° | — | — |
| 2022 | 87° | 44° | 66° | — | — |
| 2021 | 82° | 56° | 69° | 0.13" | — |
| 2020 | 82° | 43° | 62° | — | — |
| 2019 | 75° | 46° | 61° | — | — |
| 2018 | 94° | 52° | 73° | — | — |
| 2017 | 91° | 54° | 72° | — | — |
| 2016 | 71° | 47° | 59° | 0.64" | — |
| 2015 | 92° | 53° | 72° | — | — |
| 2014 | 76° | 32° | 54° | — | — |
| 2013 | 71° | 57° | 64° | 6.2" | — |
| 2012 | 70° | 47° | 58° | — | — |
| 2011 | 78° | 52° | 65° | — | — |
| 2010 | 89° | 49° | 69° | — | — |
| 2009 | 73° | 41° | 57° | 0.15" | — |
| 2008 | 75° | 45° | 60° | — | — |
| 2007 | 81° | 48° | 64° | — | — |
| 2006 | 84° | 46° | 65° | — | — |
| 2005 | 79° | 52° | 65° | 0.03" | — |
| 2004 | 90° | 49° | 69° | — | — |
| 2003 | 82° | 45° | 63° | — | — |
| 2002 | 76° | 45° | 60° | 0.18" | — |
| 2001 | 89° | 42° | 66° | — | — |
| 2000 | 88° | 42° | 65° | — | — |
| 1999 | 64° | 35° | 50° | — | — |
| 1998 | 85° | 57° | 71° | 0.25" | — |
| 1997 | 92° | 55° | 73° | — | — |
| 1996 | 71° | 45° | 58° | 0.08" | — |
| 1995 | 83° | 43° | 63° | — | — |
| 1994warmest | 92° | 54° | 73° | — | — |
| 1993 | 93° | 30° | 62° | 0.89" | — |
| 1992 | 91° | — | — | — | — |
| 1991 | 75° | 51° | 63° | — | — |
| 1990 | 91° | 48° | 70° | — | — |
| 1989coldest | 39° | 31° | 35° | 0.48" | 0.3" |
| 1988 | 48° | 37° | 43° | 0.23" | — |
| 1987 | 89° | 41° | 65° | — | — |
| 1986 | 80° | 48° | 64° | — | — |
| 1985 | 75° | 46° | 61° | — | — |
| 1984 | 92° | 51° | 71° | — | — |
| 1983 | 78° | 46° | 62° | — | — |
| 1982 | 61° | 43° | 52° | 0.3" | — |
| 1981 | 88° | 54° | 71° | — | — |
| 1980 | 80° | 47° | 63° | — | — |
| 1979 | 63° | 42° | 52° | — | — |
| 1978 | 75° | 45° | 60° | — | — |
| 1977 | 77° | 49° | 63° | — | — |
| 1976 | 82° | 50° | 66° | — | — |
| 1975 | 56° | 42° | 49° | — | — |
| 1974 | 45° | 36° | 40° | — | — |
| 1973 | 74° | 45° | 59° | — | — |
| 1972 | 84° | 47° | 65° | — | — |
| 1971 | 80° | 46° | 63° | — | — |
55 years of data from LONGMONT 2 ESE