Weather on August 21
Pomona, CA
55 Years of Data
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.
| 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° | — | — |
Pomona, CA Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Pomona, CA Monthly Precipitation
Average rainfall per month, in inches.
Pomona, CA Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Pomona, CA
Pomona, CA has no months that meet our "pleasant" threshold — every season has tradeoffs.