Weather on September 1
Downey, CA
55 Years of Data
Avg High
89°F
Avg Low
65°F
Warmest
1998
92°F avg
Coldest
1999
67°F avg
About This Date
September 1st in Downey, CA typically brings warm fall weather, with average highs around 89°F and lows near 65°F. Over 55 years of records, the warmest September 1st was in 1998 (92°F average), while the coldest was 1999 (67°F) — a 25°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 1.7°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.7°F cooler on this date compared to 20-30 years ago.
Planning for September 1st in Downey, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 91° | 67° | 79° | — | — |
| 2024 | 90° | 62° | 76° | — | — |
| 2023 | 89° | 63° | 76° | — | — |
| 2022 | 98° | 72° | 85° | — | — |
| 2021 | 76° | 62° | 69° | — | — |
| 2020 | 84° | 59° | 72° | — | — |
| 2019 | 91° | 65° | 78° | — | — |
| 2018 | 79° | 62° | 70° | — | — |
| 2017 | 104° | 72° | 88° | — | — |
| 2016 | 79° | 66° | 72° | — | — |
| 2015 | 83° | 64° | 73° | — | — |
| 2014 | 87° | 61° | 74° | — | — |
| 2013 | 90° | 68° | 79° | — | — |
| 2012 | 89° | 65° | 77° | — | — |
| 2011 | 91° | 55° | 73° | — | — |
| 2010 | 90° | 58° | 74° | — | — |
| 2009 | 95° | 71° | 83° | — | — |
| 2008 | 85° | 62° | 73° | — | — |
| 2007 | 105° | 72° | 88° | — | — |
| 2006 | 92° | 61° | 76° | — | — |
| 2005 | 93° | 61° | 77° | — | — |
| 2004 | 97° | — | — | — | — |
| 2003 | 91° | 63° | 77° | — | — |
| 2002 | 107° | 62° | 85° | — | — |
| 2001 | 92° | 59° | 75° | — | — |
| 2000 | 78° | 62° | 70° | — | — |
| 1999coldest | 77° | 57° | 67° | — | — |
| 1998warmest | 106° | 78° | 92° | — | — |
| 1997 | 93° | 65° | 79° | — | — |
| 1996 | 96° | 68° | 82° | — | — |
| 1995 | 97° | 68° | 82° | — | — |
| 1994 | 85° | 65° | 75° | — | — |
| 1993 | 89° | 66° | 78° | — | — |
| 1992 | 80° | 61° | 70° | — | — |
| 1991 | 93° | 60° | 77° | — | — |
| 1990 | 88° | 62° | 75° | — | — |
| 1989 | 86° | 60° | 73° | — | — |
| 1988 | 88° | 64° | 76° | — | — |
| 1987 | 102° | 66° | 84° | — | — |
| 1986 | 84° | 68° | 76° | — | — |
| 1985 | 96° | 70° | 83° | — | — |
| 1984 | 92° | 68° | 80° | — | — |
| 1983 | 92° | 70° | 81° | — | — |
| 1982 | 98° | 68° | 83° | — | — |
| 1981 | 88° | 61° | 74° | — | — |
| 1980 | 78° | 65° | 71° | — | — |
| 1979 | 85° | 66° | 75° | — | — |
| 1978 | 80° | 64° | 72° | — | — |
| 1977 | 79° | 66° | 72° | — | — |
| 1976 | 80° | 69° | 75° | — | — |
| 1975 | 80° | 63° | 71° | — | — |
| 1974 | 90° | 61° | 75° | — | — |
| 1973 | 75° | 61° | 68° | — | — |
| 1972 | 78° | 66° | 72° | — | — |
| 1971 | 81° | 65° | 73° | — | — |
55 years of data from MONTEBELLO