Weather on September 20
Hayward, CA
55 Years of Data
Avg High
77°F
Avg Low
56°F
Warmest
1983
79°F avg
Coldest
1975
55°F avg
About This Date
September 20th in Hayward, CA typically brings pleasant fall weather, with average highs around 77°F and lows near 56°F. Over 53 years of records, the warmest September 20th was in 1983 (79°F average), while the coldest was 1975 (55°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 6% of September 20th dates historically, with the wettest September 20th recording 1.32" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for September 20th in Hayward, CA? Great weather for outdoor activities.
Warming Trend
1.2°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 75° | 60° | 68° | — | — |
| 2024 | 74° | 58° | 66° | — | — |
| 2023 | 74° | 61° | 67° | — | — |
| 2022 | 76° | 56° | 66° | — | — |
| 2021 | 86° | 55° | 71° | — | — |
| 2020 | 89° | 60° | 75° | — | — |
| 2019 | 81° | 55° | 68° | — | — |
| 2018 | 88° | 56° | 72° | — | — |
| 2017 | 71° | 59° | 65° | — | — |
| 2016 | 79° | 58° | 68° | — | — |
| 2015 | 96° | 59° | 78° | — | — |
| 2014 | 77° | 66° | 72° | — | — |
| 2013 | 69° | 53° | 61° | — | — |
| 2012 | 66° | 55° | 61° | — | — |
| 2011 | 92° | 63° | 77° | — | — |
| 2010 | 75° | 60° | 68° | — | — |
| 2009 | 84° | 59° | 72° | — | — |
| 2008 | 70° | 61° | 65° | — | — |
| 2007 | 70° | 52° | 61° | — | — |
| 2006 | 81° | 54° | 67° | — | — |
| 2005 | 68° | 55° | 62° | 0.03" | — |
| 2004 | 74° | 53° | 63° | — | — |
| 2003 | 92° | 58° | 75° | — | — |
| 2002 | 90° | 63° | 76° | — | — |
| 2001 | 70° | 56° | 63° | — | — |
| 2000 | 86° | 64° | 75° | — | — |
| 1999 | 71° | 57° | 64° | — | — |
| 1998 | 67° | 56° | 61° | — | — |
| 1997 | 88° | 62° | 75° | — | — |
| 1996 | 85° | 61° | 73° | — | — |
| 1995 | 79° | 56° | 67° | — | — |
| 1994 | 75° | 54° | 64° | — | — |
| 1993 | 74° | 53° | 63° | — | — |
| 1992 | 77° | 54° | 65° | — | — |
| 1989 | 70° | 50° | 60° | — | — |
| 1988 | 75° | 53° | 64° | — | — |
| 1987 | 85° | 50° | 67° | — | — |
| 1986 | 69° | 50° | 60° | — | — |
| 1985 | 74° | 52° | 63° | — | — |
| 1984 | 86° | 60° | 73° | — | — |
| 1983warmest | 89° | 69° | 79° | — | — |
| 1982 | 73° | 51° | 62° | — | — |
| 1981 | 79° | 55° | 67° | — | — |
| 1980 | 71° | 57° | 64° | — | — |
| 1979 | 79° | 56° | 67° | — | — |
| 1978 | 80° | 53° | 67° | — | — |
| 1977 | 73° | 57° | 65° | 1.32" | — |
| 1976 | 70° | 52° | 61° | — | — |
| 1975coldest | 61° | 50° | 55° | — | — |
| 1974 | 69° | 54° | 61° | — | — |
| 1973 | 73° | 56° | 64° | 1.19" | — |
| 1972 | 70° | 47° | 58° | — | — |
| 1971 | 84° | 49° | 66° | — | — |
53 years of data from HAYWARD AIR TERMINAL