Weather on June 21
Sunnyvale, CA
55 Years of Data
Avg High
78°F
Avg Low
57°F
Warmest
1981
81°F avg
Coldest
1975
56°F avg
About This Date
June 21st in Sunnyvale, CA typically brings pleasant summer weather, with average highs around 78°F and lows near 57°F. Over 55 years of records, the warmest June 21st was in 1981 (81°F average), while the coldest was 1975 (56°F) — a 25°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 June 21st in Sunnyvale, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 75° | 54° | 64° | — | — |
| 2024 | 84° | 57° | 71° | — | — |
| 2023 | 73° | 49° | 61° | — | — |
| 2022 | 102° | 60° | 81° | — | — |
| 2021 | 78° | 57° | 68° | — | — |
| 2020 | 82° | 58° | 70° | — | — |
| 2019 | 76° | 56° | 66° | — | — |
| 2018 | 73° | 54° | 63° | — | — |
| 2017 | 84° | 59° | 72° | — | — |
| 2016 | 85° | 58° | 71° | — | — |
| 2015 | 70° | 56° | 63° | — | — |
| 2014 | 71° | 56° | 63° | — | — |
| 2013 | 79° | 53° | 66° | — | — |
| 2012 | 68° | 53° | 61° | — | — |
| 2011 | 91° | 64° | 78° | — | — |
| 2010 | 80° | 54° | 67° | — | — |
| 2009 | 75° | 52° | 63° | — | — |
| 2008 | 95° | 65° | 80° | — | — |
| 2007 | 77° | 55° | 66° | — | — |
| 2006 | 94° | 59° | 76° | — | — |
| 2005 | 74° | 55° | 64° | — | — |
| 2004 | 72° | 54° | 63° | — | — |
| 2003 | 74° | 55° | 64° | — | — |
| 2002 | 65° | 54° | 59° | — | — |
| 2001 | 86° | 62° | 74° | — | — |
| 2000 | 80° | 61° | 70° | — | — |
| 1999 | 70° | 57° | 63° | — | — |
| 1998 | 78° | 55° | 67° | — | — |
| 1997 | 78° | 54° | 66° | — | — |
| 1996 | 73° | 52° | 62° | — | — |
| 1995 | 88° | 55° | 71° | — | — |
| 1994 | 72° | 53° | 62° | — | — |
| 1993 | 74° | 58° | 66° | — | — |
| 1992 | 83° | 61° | 72° | — | — |
| 1991 | 69° | 52° | 60° | — | — |
| 1990 | 77° | 61° | 69° | — | — |
| 1989 | 98° | 61° | 79° | — | — |
| 1988 | 74° | 58° | 66° | — | — |
| 1987 | 74° | 60° | 67° | — | — |
| 1986 | 86° | 57° | 72° | — | — |
| 1985 | 74° | 62° | 68° | — | — |
| 1984 | 80° | 53° | 67° | — | — |
| 1983 | 78° | 54° | 66° | — | — |
| 1982 | 68° | 58° | 63° | — | — |
| 1981warmest | 96° | 66° | 81° | — | — |
| 1980 | 73° | 53° | 63° | — | — |
| 1979 | 69° | 53° | 61° | — | — |
| 1978 | 69° | 56° | 62° | — | — |
| 1977 | 92° | 60° | 76° | — | — |
| 1976 | 71° | 54° | 62° | — | — |
| 1975coldest | 62° | 50° | 56° | — | — |
| 1974 | 75° | 56° | 65° | — | — |
| 1973 | 91° | 63° | 77° | — | — |
| 1972 | 70° | 59° | 64° | — | — |
| 1971 | 75° | 59° | 67° | — | — |
55 years of data from MOFFETT FED AIRFIELD