Weather on September 11
Hayward, CA
55 Years of Data
Avg High
76°F
Avg Low
56°F
Warmest
1979
78°F avg
Coldest
1989
53°F avg
About This Date
September 11th in Hayward, CA typically brings pleasant fall weather, with average highs around 76°F and lows near 56°F. Over 53 years of records, the warmest September 11th was in 1979 (78°F average), while the coldest was 1989 (53°F) — a 25°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 1.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.4°F warmer on this date compared to 20-30 years ago.
Planning for September 11th in Hayward, CA? Great weather for outdoor activities.
Warming Trend
1.1°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 72° | 62° | 67° | — | — |
| 2024 | 74° | 60° | 67° | — | — |
| 2023 | 78° | 56° | 67° | — | — |
| 2022 | 82° | 65° | 73° | — | — |
| 2021 | 75° | 56° | 65° | — | — |
| 2020 | 77° | 58° | 67° | — | — |
| 2019 | 83° | 57° | 70° | — | — |
| 2018 | 72° | 55° | 63° | — | — |
| 2017 | 89° | 67° | 78° | — | — |
| 2016 | 71° | 59° | 65° | — | — |
| 2015 | 81° | 59° | 70° | — | — |
| 2014 | 87° | 60° | 74° | — | — |
| 2013 | 74° | 61° | 67° | — | — |
| 2012 | 75° | 53° | 64° | — | — |
| 2011 | 76° | 60° | 68° | — | — |
| 2010 | 85° | 57° | 71° | — | — |
| 2009 | 86° | 59° | 73° | — | — |
| 2008 | 74° | 58° | 66° | — | — |
| 2007 | 70° | 60° | 65° | — | — |
| 2006 | 83° | 55° | 69° | — | — |
| 2005 | 65° | 55° | 60° | — | — |
| 2004 | 82° | 59° | 71° | — | — |
| 2003 | 91° | 61° | 76° | — | — |
| 2002 | 78° | 56° | 67° | — | — |
| 2001 | 74° | 59° | 66° | — | — |
| 2000 | 80° | 54° | 67° | — | — |
| 1999 | 70° | 59° | 64° | — | — |
| 1998 | 84° | 60° | 72° | — | — |
| 1997 | 77° | 59° | 68° | — | — |
| 1996 | 62° | 52° | 57° | — | — |
| 1995 | 77° | 54° | 65° | — | — |
| 1994 | 67° | 53° | 60° | — | — |
| 1993 | 63° | 52° | 57° | — | — |
| 1992 | 72° | 55° | 63° | — | — |
| 1989coldest | 60° | 47° | 53° | — | — |
| 1988 | 72° | 52° | 62° | — | — |
| 1987 | 72° | 56° | 64° | — | — |
| 1986 | 84° | 50° | 67° | — | — |
| 1985 | 68° | 52° | 60° | — | — |
| 1984 | 75° | 55° | 65° | — | — |
| 1983 | 89° | 55° | 72° | — | — |
| 1982 | 78° | 57° | 68° | — | — |
| 1981 | 76° | 56° | 66° | — | — |
| 1980 | 68° | 56° | 62° | — | — |
| 1979warmest | 98° | 58° | 78° | — | — |
| 1978 | 73° | 52° | 62° | — | — |
| 1977 | 69° | 53° | 61° | — | — |
| 1976 | 76° | 57° | 66° | — | — |
| 1975 | 66° | 52° | 59° | — | — |
| 1974 | 85° | 55° | 70° | — | — |
| 1973 | 70° | 52° | 61° | — | — |
| 1972 | 71° | 51° | 61° | — | — |
| 1971 | 81° | 53° | 67° | — | — |
53 years of data from HAYWARD AIR TERMINAL