Weather on August 20
Sunnyvale, CA
55 Years of Data
Avg High
77°F
Avg Low
59°F
Warmest
2023
79°F avg
Coldest
2001
62°F avg
About This Date
August 20th in Sunnyvale, CA typically brings pleasant summer weather, with average highs around 77°F and lows near 59°F. Over 55 years of records, the warmest August 20th was in 2023 (79°F average), while the coldest was 2001 (62°F) — a 17°F range across recorded history. Rain or other precipitation has occurred on about 2% of August 20th dates historically, with the wettest August 20th recording 1.27" of rain. The last decade has been 5.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.0°F warmer on this date compared to 20-30 years ago.
Planning for August 20th in Sunnyvale, CA? Great weather for outdoor activities.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 84° | 59° | 72° | — | — |
| 2024 | 89° | 59° | 74° | — | — |
| 2023warmest | 93° | 64° | 79° | — | — |
| 2022 | 89° | 60° | 75° | — | — |
| 2021 | 76° | 59° | 67° | — | — |
| 2020 | 85° | 60° | 72° | — | — |
| 2019 | 75° | 60° | 68° | — | — |
| 2018 | 73° | 58° | 65° | — | — |
| 2017 | 78° | 60° | 69° | — | — |
| 2016 | 72° | 60° | 66° | — | — |
| 2015 | 72° | 63° | 67° | — | — |
| 2014 | 79° | 60° | 69° | — | — |
| 2013 | 78° | 61° | 69° | — | — |
| 2012 | 70° | 58° | 64° | — | — |
| 2011 | 76° | 59° | 67° | — | — |
| 2010 | 72° | 59° | 65° | — | — |
| 2009 | 73° | 60° | 67° | — | — |
| 2008 | 79° | 61° | 70° | — | — |
| 2007 | 80° | 64° | 72° | — | — |
| 2006 | 69° | 58° | 63° | — | — |
| 2005 | 69° | 59° | 64° | — | — |
| 2004 | 78° | 59° | 69° | — | — |
| 2003 | 79° | 59° | 69° | — | — |
| 2002 | 82° | 55° | 69° | — | — |
| 2001coldest | 71° | 54° | 62° | — | — |
| 2000 | 76° | 51° | 63° | — | — |
| 1999 | 73° | 57° | 65° | — | — |
| 1998 | 70° | 58° | 64° | — | — |
| 1997 | 77° | 60° | 69° | 1.27" | — |
| 1996 | 74° | 53° | 63° | — | — |
| 1995 | 88° | 65° | 76° | — | — |
| 1994 | 82° | 55° | 69° | — | — |
| 1993 | 75° | 61° | 68° | — | — |
| 1992 | 73° | 61° | 67° | — | — |
| 1991 | 70° | 60° | 65° | — | — |
| 1990 | 76° | 60° | 68° | — | — |
| 1989 | 77° | 58° | 67° | — | — |
| 1988 | 76° | 59° | 67° | — | — |
| 1987 | 74° | 59° | 66° | — | — |
| 1986 | 72° | 59° | 65° | — | — |
| 1985 | 75° | 59° | 67° | — | — |
| 1984 | 78° | 58° | 68° | — | — |
| 1983 | 76° | 63° | 69° | — | — |
| 1982 | 72° | 59° | 65° | — | — |
| 1981 | 74° | 57° | 65° | — | — |
| 1980 | 76° | 60° | 68° | — | — |
| 1979 | 73° | 61° | 67° | — | — |
| 1978 | 80° | 58° | 69° | — | — |
| 1977 | 71° | 58° | 64° | — | — |
| 1976 | 84° | 61° | 72° | — | — |
| 1975 | 75° | 54° | 64° | — | — |
| 1974 | 88° | 58° | 73° | — | — |
| 1973 | 76° | 58° | 67° | — | — |
| 1972 | 76° | 62° | 69° | — | — |
| 1971 | 77° | 60° | 69° | — | — |
55 years of data from MOFFETT FED AIRFIELD