Weather on August 21
Santa Clara, CA
55 Years of Data
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.
| 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° | — | — |
Santa Clara, CA Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Santa Clara, CA Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Santa Clara, 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 Santa Clara, CA
Santa Clara, CA has no months that meet our "pleasant" threshold — every season has tradeoffs.