Weather on September 12
Hayward, CA
55 Years of Data
Avg High
76°F
Avg Low
57°F
Warmest
1979
83°F avg
Coldest
1989
57°F avg
About This Date
September 12th in Hayward, CA typically brings pleasant fall weather, with average highs around 76°F and lows near 57°F. Over 53 years of records, the warmest September 12th was in 1979 (83°F average), while the coldest was 1989 (57°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 2% of September 12th dates historically. The last decade has been 1.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.9°F warmer on this date compared to 20-30 years ago.
Planning for September 12th in Hayward, CA? Great weather for outdoor activities.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 70° | 62° | 66° | — | — |
| 2024 | 80° | 61° | 70° | — | — |
| 2023 | 77° | 60° | 69° | — | — |
| 2022 | 72° | 61° | 66° | — | — |
| 2021 | 82° | 56° | 69° | — | — |
| 2020 | 82° | 56° | 69° | — | — |
| 2019 | 92° | 60° | 76° | — | — |
| 2018 | 69° | 56° | 62° | — | — |
| 2017 | 88° | 64° | 76° | — | — |
| 2016 | 68° | 58° | 63° | — | — |
| 2015 | 75° | 58° | 66° | — | — |
| 2014 | 82° | 60° | 71° | — | — |
| 2013 | 72° | 58° | 65° | — | — |
| 2012 | 71° | 55° | 63° | — | — |
| 2011 | 74° | 61° | 67° | — | — |
| 2010 | 71° | 54° | 62° | — | — |
| 2009 | 67° | 60° | 63° | 0.05" | — |
| 2008 | 68° | 56° | 62° | — | — |
| 2007 | 68° | 60° | 64° | — | — |
| 2006 | 90° | 60° | 75° | — | — |
| 2005 | 65° | 55° | 60° | — | — |
| 2004 | 71° | 60° | 66° | — | — |
| 2003 | 94° | 66° | 80° | — | — |
| 2002 | 70° | 55° | 62° | — | — |
| 2001 | 66° | 58° | 62° | — | — |
| 2000 | 82° | 57° | 70° | — | — |
| 1999 | 71° | 59° | 65° | — | — |
| 1998 | 87° | 65° | 76° | — | — |
| 1997 | 71° | 58° | 64° | — | — |
| 1996 | 72° | 53° | 62° | — | — |
| 1995 | 73° | 53° | 63° | — | — |
| 1994 | 69° | 53° | 61° | — | — |
| 1993 | 72° | 52° | 62° | — | — |
| 1992 | 76° | 54° | 65° | — | — |
| 1989coldest | 60° | 53° | 57° | — | — |
| 1988 | 88° | 51° | 69° | — | — |
| 1987 | 73° | 56° | 64° | — | — |
| 1986 | 78° | 65° | 71° | — | — |
| 1985 | 68° | 51° | 60° | — | — |
| 1984 | 74° | 53° | 63° | — | — |
| 1983 | 99° | 65° | 82° | — | — |
| 1982 | 88° | 56° | 72° | — | — |
| 1981 | 74° | 56° | 65° | — | — |
| 1980 | 71° | 53° | 62° | — | — |
| 1979warmest | 104° | 63° | 83° | — | — |
| 1978 | 78° | 52° | 65° | — | — |
| 1977 | 68° | 55° | 62° | — | — |
| 1976 | 68° | 53° | 61° | — | — |
| 1975 | 67° | 50° | 58° | — | — |
| 1974 | 92° | 52° | 72° | — | — |
| 1973 | 70° | 50° | 60° | — | — |
| 1972 | 67° | 51° | 59° | — | — |
| 1971 | 83° | 55° | 69° | — | — |
53 years of data from HAYWARD AIR TERMINAL