Weather on September 15
El Monte, CA
55 Years of Data
Avg High
87°F
Avg Low
61°F
Warmest
2012
89°F avg
Coldest
1977
66°F avg
About This Date
September 15th in El Monte, CA typically brings warm fall weather, with average highs around 87°F and lows near 61°F — a 26°F daily swing. Over 55 years of records, the warmest September 15th was in 2012 (89°F average), while the coldest was 1977 (66°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 2% of September 15th dates historically. The last decade has been 1.5°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.5°F cooler on this date compared to 20-30 years ago.
Planning for September 15th in El Monte, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 90° | 62° | 76° | — | — |
| 2024 | 76° | 60° | 68° | — | — |
| 2023 | 79° | 61° | 70° | — | — |
| 2022 | 81° | 62° | 71° | — | — |
| 2021 | 83° | 56° | 69° | — | — |
| 2020 | 95° | 69° | 82° | — | — |
| 2019 | 92° | 64° | 78° | — | — |
| 2018 | 88° | 63° | 75° | — | — |
| 2017 | 74° | 60° | 67° | — | — |
| 2016 | 89° | 52° | 70° | — | — |
| 2015 | 77° | 63° | 70° | — | — |
| 2014 | 100° | 73° | 87° | — | — |
| 2013 | 94° | 65° | 79° | — | — |
| 2012warmest | 102° | 75° | 89° | — | — |
| 2011 | 88° | 60° | 74° | — | — |
| 2010 | 86° | 57° | 72° | — | — |
| 2009 | 83° | 60° | 71° | — | — |
| 2008 | 91° | 60° | 76° | — | — |
| 2007 | 83° | 57° | 70° | — | — |
| 2006 | 73° | 62° | 68° | — | — |
| 2005 | 76° | 56° | 66° | — | — |
| 2004 | 83° | 67° | 75° | — | — |
| 2003 | 89° | 64° | 77° | — | — |
| 2002 | 92° | 59° | 75° | — | — |
| 2001 | 91° | 58° | 74° | — | — |
| 2000 | 97° | 63° | 80° | — | — |
| 1999 | 85° | 54° | 69° | — | — |
| 1998 | 85° | 63° | 74° | — | — |
| 1997 | 91° | 69° | 80° | — | — |
| 1996 | 79° | 64° | 71° | — | — |
| 1995 | 98° | 63° | 80° | — | — |
| 1994 | 95° | 56° | 75° | — | — |
| 1993 | 80° | 58° | 69° | — | — |
| 1992 | 88° | 59° | 73° | — | — |
| 1991 | 82° | 64° | 73° | — | — |
| 1990 | 92° | 60° | 76° | — | — |
| 1989 | 98° | 63° | 80° | — | — |
| 1988 | 85° | 55° | 70° | — | — |
| 1987 | 87° | 57° | 72° | — | — |
| 1986 | 80° | 52° | 66° | — | — |
| 1985 | 88° | 56° | 72° | — | — |
| 1984 | 102° | 67° | 84° | — | — |
| 1983 | 91° | 64° | 78° | — | — |
| 1982 | 75° | 61° | 68° | — | — |
| 1981 | 91° | 60° | 76° | — | — |
| 1980 | 78° | 54° | 66° | — | — |
| 1979 | 105° | 65° | 85° | — | — |
| 1978 | 80° | 54° | 67° | — | — |
| 1977coldest | 79° | 54° | 66° | — | — |
| 1976 | 78° | 63° | 70° | 0.08" | — |
| 1975 | 92° | 60° | 76° | — | — |
| 1974 | 86° | 54° | 70° | — | — |
| 1973 | 80° | 60° | 70° | — | — |
| 1972 | 82° | 52° | 67° | — | — |
| 1971 | 96° | 68° | 82° | — | — |
55 years of data from SAN GABRIEL FIRE DEPT