Weather on August 21
Oceanside, CA
55 Years of Data
Avg High
76°F
Avg Low
62°F
Warmest
2018
77°F avg
Coldest
1975
63°F avg
About This Date
August 21st in Oceanside, CA typically brings pleasant summer weather, with average highs around 76°F and lows near 62°F. Over 55 years of records, the warmest August 21st was in 2018 (77°F average), while the coldest was 1975 (63°F) — a 14°F range across recorded history. Rain or other precipitation has occurred on about 2% of August 21st dates historically. The last decade has been 3.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.3°F warmer on this date compared to 20-30 years ago.
Planning for August 21st in Oceanside, CA? Great weather for outdoor activities.
Warming Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 84° | 61° | 72° | — | — |
| 2024 | 86° | 63° | 74° | — | — |
| 2023 | 79° | 63° | 71° | — | — |
| 2022 | 78° | 63° | 70° | — | — |
| 2021 | 76° | 66° | 71° | 0.08" | — |
| 2020 | 90° | 65° | 77° | — | — |
| 2019 | 80° | 54° | 67° | — | — |
| 2018warmest | 82° | 71° | 77° | — | — |
| 2017 | 78° | 61° | 69° | — | — |
| 2016 | 77° | 59° | 68° | — | — |
| 2015 | 78° | 67° | 72° | — | — |
| 2014 | 80° | 65° | 72° | — | — |
| 2013 | 77° | 62° | 70° | — | — |
| 2012 | 81° | 66° | 73° | — | — |
| 2011 | 72° | 62° | 67° | — | — |
| 2010 | 79° | 57° | 68° | — | — |
| 2009 | 74° | 57° | 65° | — | — |
| 2008 | 78° | 64° | 71° | — | — |
| 2007 | 83° | 62° | 72° | — | — |
| 2006 | 74° | 59° | 66° | — | — |
| 2005 | 73° | 63° | 68° | — | — |
| 2004 | 76° | 57° | 66° | — | — |
| 2003 | 78° | 66° | 72° | — | — |
| 2002 | 74° | 59° | 66° | — | — |
| 2001 | 74° | 65° | 69° | — | — |
| 2000 | 77° | 61° | 69° | — | — |
| 1999 | 70° | 61° | 65° | — | — |
| 1998 | 73° | 61° | 67° | — | — |
| 1997 | 84° | 64° | 74° | — | — |
| 1996 | 73° | 61° | 67° | — | — |
| 1995 | 70° | 64° | 67° | — | — |
| 1994 | 72° | 65° | 68° | — | — |
| 1993 | 69° | 59° | 64° | — | — |
| 1992 | 75° | 72° | 73° | — | — |
| 1991 | 68° | 62° | 65° | — | — |
| 1990 | 71° | 58° | 64° | — | — |
| 1989 | 71° | 64° | 68° | — | — |
| 1988 | 67° | 63° | 65° | — | — |
| 1987 | 69° | 58° | 63° | — | — |
| 1986 | 72° | 66° | 69° | — | — |
| 1985 | 69° | 61° | 65° | — | — |
| 1984 | 78° | 70° | 74° | — | — |
| 1983 | 78° | 66° | 72° | — | — |
| 1982 | 77° | 66° | 72° | — | — |
| 1981 | 76° | 63° | 69° | — | — |
| 1980 | 74° | 59° | 66° | — | — |
| 1979 | 74° | 58° | 66° | — | — |
| 1978 | 71° | 60° | 66° | — | — |
| 1977 | 76° | 66° | 71° | — | — |
| 1976 | 75° | 59° | 67° | — | — |
| 1975coldest | 75° | 50° | 63° | — | — |
| 1974 | 76° | 62° | 69° | — | — |
| 1973 | 78° | 65° | 71° | — | — |
| 1972 | 82° | 59° | 71° | — | — |
| 1971 | 79° | 66° | 72° | — | — |
55 years of data from OCEANSIDE MUNI AP