Weather on August 21
El Monte, CA
55 Years of Data
Avg High
89°F
Avg Low
62°F
Warmest
1982
87°F avg
Coldest
2021
67°F avg
About This Date
August 21st in El Monte, CA typically brings warm summer weather, with average highs around 89°F and lows near 62°F — a 27°F daily swing. Over 55 years of records, the warmest August 21st was in 1982 (87°F average), while the coldest was 2021 (67°F) — a 20°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 1.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.1°F warmer on this date compared to 20-30 years ago.
Planning for August 21st in El Monte, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 97° | 69° | 83° | — | — |
| 2024 | 95° | 64° | 80° | — | — |
| 2023 | 81° | 61° | 71° | — | — |
| 2022 | 83° | 62° | 72° | — | — |
| 2021coldest | 73° | 61° | 67° | — | — |
| 2020 | 94° | 69° | 81° | — | — |
| 2019 | 94° | 65° | 79° | — | — |
| 2018 | 86° | 66° | 76° | — | — |
| 2017 | 84° | 62° | 73° | — | — |
| 2016 | 93° | 59° | 76° | — | — |
| 2015 | 86° | 64° | 75° | — | — |
| 2014 | 83° | 66° | 74° | — | — |
| 2013 | 88° | 63° | 75° | — | — |
| 2012 | 86° | 70° | 78° | — | — |
| 2011 | 88° | 58° | 73° | — | — |
| 2010 | 88° | 57° | 72° | — | — |
| 2009 | 83° | 62° | 72° | — | — |
| 2008 | 84° | 65° | 74° | — | — |
| 2007 | 98° | 66° | 82° | — | — |
| 2006 | 86° | 60° | 73° | — | — |
| 2005 | 87° | 61° | 74° | — | — |
| 2004 | 81° | 64° | 72° | — | — |
| 2003 | 93° | 68° | 81° | — | — |
| 2002 | 79° | 59° | 69° | — | — |
| 2001 | 83° | 53° | 68° | — | — |
| 2000 | 88° | 63° | 75° | — | — |
| 1999 | 92° | 59° | 75° | — | — |
| 1998 | 96° | 60° | 78° | — | — |
| 1997 | 92° | 67° | 79° | — | — |
| 1996 | 96° | 56° | 76° | — | — |
| 1995 | 90° | 66° | 78° | — | — |
| 1994 | 90° | 68° | 79° | — | — |
| 1993 | 92° | 56° | 74° | — | — |
| 1992 | 97° | 65° | 81° | — | — |
| 1991 | 92° | 59° | 75° | — | — |
| 1990 | 86° | 62° | 74° | — | — |
| 1989 | 81° | 60° | 70° | — | — |
| 1988 | 84° | 58° | 71° | — | — |
| 1987 | 88° | 57° | 72° | — | — |
| 1986 | 99° | 67° | 83° | — | — |
| 1985 | 89° | 59° | 74° | — | — |
| 1984 | 90° | 69° | 79° | — | — |
| 1983 | 81° | 62° | 71° | — | — |
| 1982warmest | 103° | 71° | 87° | — | — |
| 1981 | 99° | 59° | 79° | — | — |
| 1980 | 87° | 57° | 72° | — | — |
| 1979 | 86° | 58° | 72° | — | — |
| 1978 | 88° | 58° | 73° | — | — |
| 1977 | 91° | 64° | 78° | — | — |
| 1976 | 85° | 58° | 71° | — | — |
| 1975 | 79° | 60° | 69° | — | — |
| 1974 | 85° | 59° | 72° | — | — |
| 1973 | 91° | 69° | 80° | — | — |
| 1972 | 97° | 57° | 77° | — | — |
| 1971 | 86° | 66° | 76° | — | — |
55 years of data from SAN GABRIEL FIRE DEPT