Weather on August 21
Pomona, CA
55 Years of Data
Avg High
89°F
Avg Low
60°F
Warmest
1982
85°F avg
Coldest
1993
66°F avg
About This Date
August 21st in Pomona, CA typically brings warm summer weather, with average highs around 89°F and lows near 60°F — a 29°F daily swing. Over 50 years of records, the warmest August 21st was in 1982 (85°F average), while the coldest was 1993 (66°F) — a 19°F range across recorded history. This date has historically been dry, with little recorded precipitation. 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 August 21st in Pomona, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 99° | 70° | 84° | — | — |
| 2024 | 96° | 63° | 79° | — | — |
| 2023 | 80° | 60° | 70° | — | — |
| 2022 | 85° | 61° | 73° | — | — |
| 2021 | 73° | 59° | 66° | — | — |
| 2020 | 99° | 72° | 85° | — | — |
| 2019 | 95° | 63° | 79° | — | — |
| 2018 | 87° | 63° | 75° | — | — |
| 2017 | 85° | 57° | 71° | — | — |
| 2016 | 89° | 64° | 77° | — | — |
| 2015 | 86° | 59° | 73° | — | — |
| 2014 | 88° | 60° | 74° | — | — |
| 2013 | 97° | 64° | 80° | — | — |
| 2012 | 91° | 68° | 80° | — | — |
| 2011 | 86° | 59° | 73° | — | — |
| 2010 | 96° | 63° | 79° | — | — |
| 2009 | 89° | 52° | 70° | — | — |
| 2008 | 88° | 62° | 75° | — | — |
| 2007 | 99° | 62° | 80° | — | — |
| 2006 | 95° | 59° | 77° | — | — |
| 2005 | 97° | 63° | 80° | — | — |
| 2004 | 85° | 63° | 74° | — | — |
| 2003 | 90° | 66° | 78° | — | — |
| 2002 | 82° | 59° | 71° | — | — |
| 2001 | 87° | 63° | 75° | — | — |
| 2000 | 86° | 57° | 72° | — | — |
| 1998 | 97° | 62° | 79° | — | — |
| 1993coldest | 80° | 52° | 66° | — | — |
| 1992 | 82° | 53° | 68° | — | — |
| 1991 | 90° | 57° | 73° | — | — |
| 1990 | 84° | 55° | 70° | — | — |
| 1989 | 85° | 57° | 71° | — | — |
| 1988 | 84° | 56° | 70° | — | — |
| 1987 | 84° | 50° | 67° | — | — |
| 1986 | 97° | 61° | 79° | — | — |
| 1985 | 89° | 56° | 72° | — | — |
| 1984 | 88° | 68° | 78° | — | — |
| 1983 | 79° | 55° | 67° | — | — |
| 1982warmest | 100° | 70° | 85° | — | — |
| 1981 | 100° | 59° | 80° | — | — |
| 1980 | 87° | 54° | 70° | — | — |
| 1979 | 80° | 55° | 68° | — | — |
| 1978 | 90° | 56° | 73° | — | — |
| 1977 | 94° | 62° | 78° | — | — |
| 1976 | 86° | 55° | 71° | — | — |
| 1975 | 80° | 57° | 69° | — | — |
| 1974 | 82° | 57° | 70° | — | — |
| 1973 | 87° | 68° | 78° | — | — |
| 1972 | 90° | 62° | 76° | — | — |
| 1971 | 85° | 64° | 74° | — | — |
50 years of data from POMONA/FAIRPLEX