Weather on September 21
Lancaster, CA
55 Years of Data
Avg High
88°F
Avg Low
53°F
Warmest
1995
81°F avg
Coldest
1986
58°F avg
About This Date
September 21st in Lancaster, CA typically brings warm fall weather, with average highs around 88°F and lows near 53°F — a 35°F daily swing. Over 55 years of records, the warmest September 21st was in 1995 (81°F average), while the coldest was 1986 (58°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 2% of September 21st dates historically. 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 September 21st in Lancaster, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 87° | 55° | 71° | — | — |
| 2024 | 94° | 57° | 75° | — | — |
| 2023 | 73° | 57° | 65° | — | — |
| 2022 | 82° | 52° | 67° | — | — |
| 2021 | 95° | 51° | 73° | — | — |
| 2020 | 96° | 55° | 76° | — | — |
| 2019 | 87° | 47° | 67° | — | — |
| 2018 | 94° | 54° | 74° | — | — |
| 2017 | 72° | 53° | 62° | — | — |
| 2016 | 90° | 61° | 75° | — | — |
| 2015 | 98° | 61° | 79° | — | — |
| 2014 | 89° | 59° | 74° | — | — |
| 2013 | 77° | 56° | 66° | — | — |
| 2012 | 98° | 59° | 79° | — | — |
| 2011 | 99° | 58° | 78° | — | — |
| 2010 | 84° | 48° | 66° | — | — |
| 2009 | 100° | 59° | 80° | — | — |
| 2008 | 83° | 58° | 70° | — | — |
| 2007 | 77° | 41° | 59° | 0.08" | — |
| 2006 | 88° | 47° | 67° | — | — |
| 2005 | 80° | 56° | 68° | — | — |
| 2004 | 79° | 39° | 59° | — | — |
| 2003 | 100° | 52° | 76° | — | — |
| 2002 | 99° | 53° | 76° | — | — |
| 2001 | 94° | 60° | 77° | — | — |
| 2000 | 72° | 59° | 65° | — | — |
| 1999 | 91° | 55° | 73° | — | — |
| 1998 | 73° | 58° | 65° | — | — |
| 1997 | 87° | 50° | 69° | — | — |
| 1996 | 89° | 52° | 70° | — | — |
| 1995warmest | 94° | 68° | 81° | — | — |
| 1994 | 91° | 53° | 72° | — | — |
| 1993 | 85° | 48° | 66° | — | — |
| 1992 | 94° | 54° | 74° | — | — |
| 1991 | 91° | 59° | 75° | — | — |
| 1990 | 81° | 57° | 69° | — | — |
| 1989 | 90° | 47° | 68° | — | — |
| 1988 | 68° | 51° | 60° | — | — |
| 1987 | 97° | 55° | 76° | — | — |
| 1986coldest | 76° | 41° | 58° | — | — |
| 1985 | 85° | 47° | 66° | — | — |
| 1984 | 88° | 63° | 75° | — | — |
| 1983 | 89° | 62° | 76° | — | — |
| 1982 | 91° | 49° | 70° | — | — |
| 1981 | 90° | 68° | 79° | — | — |
| 1980 | 84° | 55° | 70° | — | — |
| 1979 | 96° | 52° | 74° | — | — |
| 1978 | 80° | 38° | 59° | — | — |
| 1977 | 82° | 44° | 63° | — | — |
| 1976 | 89° | 54° | 71° | — | — |
| 1975 | 92° | 54° | 73° | — | — |
| 1974 | 95° | 57° | 76° | — | — |
| 1973 | 91° | 49° | 70° | — | — |
| 1972 | 91° | 45° | 68° | — | — |
| 1971 | 83° | 50° | 66° | — | — |
55 years of data from LANCASTER