Weather on September 21
Santa Clarita, CA
55 Years of Data
Avg High
87°F
Avg Low
55°F
Warmest
2003
87°F avg
Coldest
1986
57°F avg
About This Date
September 21st in Santa Clarita, CA typically brings warm fall weather, with average highs around 87°F and lows near 55°F — a 32°F daily swing. Over 54 years of records, the warmest September 21st was in 2003 (87°F average), while the coldest was 1986 (57°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 2% of September 21st dates historically. The last decade has been 3.9°F cooler on this date compared to 20-30 years ago.
The last decade has been 3.9°F cooler on this date compared to 20-30 years ago.
Planning for September 21st in Santa Clarita, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 83° | 60° | 71° | — | — |
| 2024 | 80° | 54° | 67° | — | — |
| 2023 | 71° | 57° | 64° | — | — |
| 2022 | 80° | 54° | 67° | — | — |
| 2021 | 98° | 68° | 83° | — | — |
| 2020 | 88° | 60° | 74° | — | — |
| 2019 | 94° | 61° | 77° | — | — |
| 2018 | 89° | 60° | 75° | — | — |
| 2017 | 68° | 56° | 62° | — | — |
| 2016 | 75° | 57° | 66° | — | — |
| 2015 | 96° | 68° | 82° | — | — |
| 2014 | 87° | 57° | 72° | — | — |
| 2013 | 81° | 55° | 68° | — | — |
| 2012 | 99° | 67° | 83° | — | — |
| 2011 | 93° | 58° | 75° | — | — |
| 2010 | 75° | 54° | 64° | — | — |
| 2009 | 103° | 61° | 82° | — | — |
| 2008 | 80° | 55° | 68° | — | — |
| 2007 | 74° | 46° | 60° | — | — |
| 2006 | 83° | 54° | 68° | — | — |
| 2005 | 90° | 61° | 75° | — | — |
| 2004 | 84° | 55° | 70° | — | — |
| 2003warmest | 106° | 68° | 87° | — | — |
| 2002 | 99° | 63° | 81° | — | — |
| 2001 | 95° | 59° | 77° | — | — |
| 2000 | 62° | 61° | 61° | — | — |
| 1999 | 95° | 63° | 79° | — | — |
| 1998 | 70° | 60° | 65° | — | — |
| 1997 | 97° | 58° | 77° | — | — |
| 1996 | 90° | 56° | 73° | — | — |
| 1995 | 91° | 58° | 74° | — | — |
| 1994 | 89° | 56° | 72° | — | — |
| 1993 | 77° | 54° | 65° | — | — |
| 1992 | 96° | 56° | 76° | — | — |
| 1991 | 88° | 56° | 72° | — | — |
| 1990 | 81° | 61° | 71° | — | — |
| 1989 | 87° | 42° | 65° | — | — |
| 1988 | 66° | 51° | 59° | 0.38" | — |
| 1987 | 103° | 52° | 77° | — | — |
| 1986coldest | 77° | 38° | 57° | — | — |
| 1985 | 89° | 44° | 67° | — | — |
| 1984 | 98° | 54° | 76° | — | — |
| 1983 | 86° | 60° | 73° | — | — |
| 1982 | 92° | 43° | 67° | — | — |
| 1981 | 94° | 52° | 73° | — | — |
| 1980 | 83° | 45° | 64° | — | — |
| 1978 | 85° | 41° | 63° | — | — |
| 1977 | 80° | 48° | 64° | — | — |
| 1976 | 78° | 59° | 69° | — | — |
| 1975 | 95° | 52° | 73° | — | — |
| 1974 | 103° | 49° | 76° | — | — |
| 1973 | 84° | 47° | 65° | — | — |
| 1972 | 94° | 50° | 72° | — | — |
| 1971 | 85° | 46° | 65° | — | — |
54 years of data from SAUGUS CALIFORNIA