Weather on September 20
El Monte, CA
55 Years of Data
Avg High
85°F
Avg Low
60°F
Warmest
2015
89°F avg
Coldest
1986
64°F avg
About This Date
September 20th in El Monte, CA typically brings warm fall weather, with average highs around 85°F and lows near 60°F — a 25°F daily swing. Over 55 years of records, the warmest September 20th was in 2015 (89°F average), while the coldest was 1986 (64°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 4% of September 20th dates historically, with the wettest September 20th recording 0.97" of rain. 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 20th in El Monte, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 88° | 63° | 75° | — | — |
| 2024 | 75° | 58° | 66° | — | — |
| 2023 | 78° | 60° | 69° | — | — |
| 2022 | 83° | 62° | 72° | — | — |
| 2021 | 86° | 58° | 72° | — | — |
| 2020 | 88° | 60° | 74° | — | — |
| 2019 | 83° | 60° | 71° | — | — |
| 2018 | 82° | 59° | 71° | — | — |
| 2017 | 83° | 61° | 72° | — | — |
| 2016 | 91° | 71° | 81° | — | — |
| 2015warmest | 104° | 73° | 89° | — | — |
| 2014 | 80° | 66° | 73° | — | — |
| 2013 | 73° | 66° | 70° | — | — |
| 2012 | 94° | 63° | 78° | — | — |
| 2011 | 90° | 57° | 73° | — | — |
| 2010 | 83° | 59° | 71° | — | — |
| 2009 | 90° | 60° | 75° | — | — |
| 2008 | 79° | 59° | 69° | — | — |
| 2007 | 71° | 57° | 64° | — | — |
| 2006 | 81° | 57° | 69° | — | — |
| 2005 | 79° | 62° | 70° | 0.97" | — |
| 2004 | 82° | 58° | 70° | — | — |
| 2003 | 96° | 61° | 78° | — | — |
| 2002 | 90° | 61° | 75° | — | — |
| 2001 | 83° | 57° | 70° | — | — |
| 2000 | 84° | 64° | 74° | — | — |
| 1999 | 88° | 51° | 69° | — | — |
| 1998 | 72° | 65° | 68° | — | — |
| 1997 | 86° | 58° | 72° | — | — |
| 1996 | 90° | 61° | 75° | — | — |
| 1995 | 88° | 62° | 75° | — | — |
| 1994 | 84° | 57° | 71° | — | — |
| 1993 | 83° | 56° | 69° | — | — |
| 1992 | 94° | 58° | 76° | — | — |
| 1991 | 95° | 63° | 79° | — | — |
| 1990 | 81° | 65° | 73° | — | — |
| 1989 | 84° | 51° | 68° | — | — |
| 1988 | 76° | 64° | 70° | 0.3" | — |
| 1987 | 91° | 57° | 74° | — | — |
| 1986coldest | 76° | 52° | 64° | — | — |
| 1985 | 87° | 53° | 70° | — | — |
| 1984 | 92° | 68° | 80° | — | — |
| 1983 | 90° | 68° | 79° | — | — |
| 1982 | 88° | 55° | 71° | — | — |
| 1981 | 93° | 63° | 78° | — | — |
| 1980 | 81° | 58° | 69° | — | — |
| 1979 | 98° | 62° | 80° | — | — |
| 1978 | 90° | 51° | 70° | — | — |
| 1977 | 81° | 55° | 68° | — | — |
| 1976 | 80° | 64° | 72° | — | — |
| 1975 | 90° | 59° | 74° | — | — |
| 1974 | 88° | 60° | 74° | — | — |
| 1973 | 79° | 55° | 67° | — | — |
| 1972 | 93° | 53° | 73° | — | — |
| 1971 | 88° | 58° | 73° | — | — |
55 years of data from SAN GABRIEL FIRE DEPT