Weather on August 20
Hayward, CA
55 Years of Data
Avg High
74°F
Avg Low
57°F
Warmest
2023
75°F avg
Coldest
1998
59°F avg
About This Date
August 20th in Hayward, CA typically brings pleasant summer weather, with average highs around 74°F and lows near 57°F. Over 52 years of records, the warmest August 20th was in 2023 (75°F average), while the coldest was 1998 (59°F) — a 16°F range across recorded history. Rain or other precipitation has occurred on about 4% of August 20th dates historically. The last decade has been 4.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.7°F warmer on this date compared to 20-30 years ago.
Planning for August 20th in Hayward, CA? Great weather for outdoor activities.
Warming Trend
1.0°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 85° | 57° | 71° | — | — |
| 2024 | 83° | 59° | 71° | — | — |
| 2023warmest | 90° | 61° | 75° | — | — |
| 2022 | 83° | 58° | 70° | — | — |
| 2021 | 74° | 60° | 67° | — | — |
| 2020 | 79° | 59° | 69° | — | — |
| 2019 | 71° | 62° | 67° | — | — |
| 2018 | 71° | 58° | 64° | — | — |
| 2017 | 77° | 63° | 70° | — | — |
| 2016 | 72° | 58° | 65° | — | — |
| 2015 | 70° | 62° | 66° | — | — |
| 2014 | 76° | 63° | 69° | — | — |
| 2013 | 78° | 58° | 68° | — | — |
| 2012 | 69° | 55° | 62° | — | — |
| 2011 | 70° | 59° | 64° | — | — |
| 2010 | 72° | 56° | 64° | — | — |
| 2009 | 72° | 58° | 65° | — | — |
| 2008 | 75° | 60° | 68° | — | — |
| 2007 | 78° | 63° | 70° | — | — |
| 2006 | 68° | 56° | 62° | — | — |
| 2005 | 67° | 56° | 61° | — | — |
| 2004 | 77° | 62° | 70° | — | — |
| 2003 | 79° | 61° | 70° | — | — |
| 2002 | 70° | 57° | 63° | — | — |
| 2001 | 64° | 57° | 61° | — | — |
| 2000 | 76° | 56° | 66° | — | — |
| 1999 | 71° | 58° | 64° | — | — |
| 1998coldest | 66° | 52° | 59° | — | — |
| 1997 | 73° | 57° | 65° | — | — |
| 1996 | 74° | 52° | 63° | — | — |
| 1995 | 77° | 59° | 68° | — | — |
| 1994 | 76° | 54° | 65° | — | — |
| 1993 | 70° | 55° | 62° | — | — |
| 1989 | 70° | 56° | 63° | — | — |
| 1988 | 76° | 56° | 66° | — | — |
| 1987 | 73° | 52° | 62° | — | — |
| 1986 | 84° | 53° | 69° | — | — |
| 1985 | 69° | 56° | 62° | — | — |
| 1984 | 69° | 54° | 61° | — | — |
| 1983 | 70° | 56° | 63° | 0.18" | — |
| 1982 | 74° | 55° | 64° | — | — |
| 1981 | 71° | 55° | 63° | — | — |
| 1980 | 72° | 55° | 63° | — | — |
| 1979 | 73° | 60° | 67° | — | — |
| 1978 | 84° | 53° | 69° | — | — |
| 1977 | 70° | 56° | 63° | — | — |
| 1976 | 77° | 57° | 67° | 0.03" | — |
| 1975 | 71° | 50° | 61° | — | — |
| 1974 | 79° | 51° | 65° | — | — |
| 1973 | 77° | 45° | 61° | — | — |
| 1972 | 72° | 55° | 63° | — | — |
| 1971 | 70° | 58° | 64° | — | — |
52 years of data from HAYWARD AIR TERMINAL