Weather on September 21
Ventura, CA
55 Years of Data
Avg High
84°F
Avg Low
52°F
Warmest
2015
80°F avg
Coldest
1988
57°F avg
About This Date
September 21st in Ventura, CA typically brings warm fall weather, with average highs around 84°F and lows near 52°F — a 32°F daily swing. Over 55 years of records, the warmest September 21st was in 2015 (80°F average), while the coldest was 1988 (57°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 2% of September 21st dates historically. The last decade has been 2.7°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.7°F cooler on this date compared to 20-30 years ago.
Planning for September 21st in Ventura, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 88° | 54° | 71° | — | — |
| 2024 | 77° | 46° | 62° | — | — |
| 2023 | 70° | 56° | 63° | 0.05" | — |
| 2022 | 81° | 47° | 64° | — | — |
| 2021 | 87° | 49° | 68° | — | — |
| 2020 | 92° | 44° | 68° | — | — |
| 2019 | 83° | 46° | 64° | — | — |
| 2018 | 88° | 56° | 72° | — | — |
| 2017 | 74° | 52° | 63° | — | — |
| 2016 | 93° | 58° | 75° | — | — |
| 2015warmest | 102° | 57° | 80° | — | — |
| 2014 | 83° | 53° | 68° | — | — |
| 2013 | 78° | 53° | 66° | — | — |
| 2012 | 95° | 59° | 77° | — | — |
| 2011 | 81° | 55° | 68° | — | — |
| 2010 | 68° | 50° | 59° | — | — |
| 2009 | 88° | 52° | 70° | — | — |
| 2008 | 73° | 50° | 62° | — | — |
| 2007 | 73° | 45° | 59° | — | — |
| 2006 | 77° | 50° | 64° | — | — |
| 2005 | 82° | 52° | 67° | — | — |
| 2004 | 84° | 54° | 69° | — | — |
| 2003 | 99° | 54° | 76° | — | — |
| 2002 | 91° | 54° | 72° | — | — |
| 2001 | 86° | 50° | 68° | — | — |
| 2000 | 68° | 61° | 64° | — | — |
| 1999 | 85° | 52° | 68° | — | — |
| 1998 | 75° | 62° | 69° | — | — |
| 1997 | 95° | 52° | 73° | — | — |
| 1996 | 88° | 55° | 71° | — | — |
| 1995 | 87° | 53° | 70° | — | — |
| 1994 | 84° | 49° | 66° | — | — |
| 1993 | 73° | 51° | 62° | — | — |
| 1992 | 100° | 49° | 74° | — | — |
| 1991 | 92° | 52° | 72° | — | — |
| 1990 | 76° | 59° | 67° | — | — |
| 1989 | 100° | 53° | 77° | — | — |
| 1988coldest | 68° | 47° | 57° | — | — |
| 1987 | 92° | 55° | 73° | — | — |
| 1986 | 71° | 48° | 60° | — | — |
| 1985 | 90° | 44° | 67° | — | — |
| 1984 | 80° | 59° | 70° | — | — |
| 1983 | 85° | 71° | 78° | — | — |
| 1982 | 89° | 49° | 69° | — | — |
| 1981 | 87° | 49° | 68° | — | — |
| 1980 | 75° | 42° | 59° | — | — |
| 1979 | 91° | 49° | 70° | — | — |
| 1978 | 90° | 42° | 66° | — | — |
| 1977 | 84° | 49° | 66° | — | — |
| 1976 | 79° | 57° | 68° | — | — |
| 1975 | 96° | 61° | 78° | — | — |
| 1974 | 83° | 53° | 68° | — | — |
| 1973 | 73° | 54° | 63° | — | — |
| 1972 | 98° | 53° | 76° | — | — |
| 1971 | 77° | 56° | 66° | — | — |
55 years of data from OJAI CALIFORNIA