Weather on August 21
Santa Clara, CA
55 Years of Data
Avg High
80°F
Avg Low
58°F
Warmest
2025
76°F avg
Coldest
2001
63°F avg
About This Date
August 21st in Santa Clara, CA typically brings warm summer weather, with average highs around 80°F and lows near 58°F. Over 55 years of records, the warmest August 21st was in 2025 (76°F average), while the coldest was 2001 (63°F) — a 13°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 3.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.5°F warmer on this date compared to 20-30 years ago.
Planning for August 21st in Santa Clara, 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 |
|---|---|---|---|---|---|
| 2025warmest | 91° | 61° | 76° | — | — |
| 2024 | 83° | 61° | 72° | — | — |
| 2023 | 76° | 69° | 72° | — | — |
| 2022 | 85° | 59° | 72° | — | — |
| 2021 | 77° | 60° | 69° | — | — |
| 2020 | 89° | 61° | 75° | — | — |
| 2019 | 85° | 58° | 71° | — | — |
| 2018 | 75° | 60° | 68° | — | — |
| 2017 | 82° | 64° | 73° | — | — |
| 2016 | 78° | 60° | 69° | — | — |
| 2015 | 79° | 60° | 69° | — | — |
| 2014 | 80° | 59° | 70° | — | — |
| 2013 | 77° | 57° | 67° | — | — |
| 2012 | 78° | 55° | 67° | — | — |
| 2011 | 75° | 59° | 67° | — | — |
| 2010 | 71° | 56° | 63° | — | — |
| 2009 | 91° | 59° | 75° | — | — |
| 2008 | 80° | 62° | 71° | — | — |
| 2007 | 86° | 62° | 74° | — | — |
| 2006 | 73° | 56° | 64° | — | — |
| 2005 | 73° | 56° | 64° | — | — |
| 2004 | 76° | 63° | 69° | — | — |
| 2003 | 77° | 63° | 70° | — | — |
| 2002 | 77° | 55° | 66° | — | — |
| 2001coldest | 73° | 54° | 63° | — | — |
| 2000 | 86° | 54° | 70° | — | — |
| 1999 | 85° | 56° | 70° | — | — |
| 1998 | 83° | 54° | 68° | — | — |
| 1997 | 84° | 60° | 72° | — | — |
| 1996 | 85° | 56° | 70° | — | — |
| 1995 | 79° | 62° | 70° | — | — |
| 1994 | 79° | 55° | 67° | — | — |
| 1993 | 88° | 58° | 73° | — | — |
| 1992 | 82° | 59° | 71° | — | — |
| 1991 | 76° | 59° | 67° | — | — |
| 1990 | 79° | 64° | 71° | — | — |
| 1989 | 80° | 57° | 69° | — | — |
| 1988 | 78° | 56° | 67° | — | — |
| 1987 | 77° | 54° | 65° | — | — |
| 1986 | 77° | 58° | 67° | — | — |
| 1985 | 77° | 54° | 65° | — | — |
| 1984 | 80° | 54° | 67° | — | — |
| 1983 | 76° | 61° | 68° | — | — |
| 1982 | 88° | 56° | 72° | — | — |
| 1981 | 83° | 52° | 67° | — | — |
| 1980 | 78° | 58° | 68° | — | — |
| 1979 | 76° | 56° | 66° | — | — |
| 1978 | 77° | 55° | 66° | — | — |
| 1977 | 75° | 53° | 64° | — | — |
| 1976 | 81° | 60° | 70° | — | — |
| 1975 | 79° | 53° | 66° | — | — |
| 1974 | 88° | 51° | 69° | — | — |
| 1973 | 82° | 51° | 67° | — | — |
| 1972 | 88° | 57° | 72° | — | — |
| 1971 | 80° | 58° | 69° | — | — |
55 years of data from SANTA CLARA UNIV