Weather on September 23
Hayward, CA
55 Years of Data
Avg High
78°F
Avg Low
55°F
Warmest
1997
81°F avg
Coldest
1996
57°F avg
About This Date
September 23rd in Hayward, CA typically brings pleasant fall weather, with average highs around 78°F and lows near 55°F. Over 53 years of records, the warmest September 23rd was in 1997 (81°F average), while the coldest was 1996 (57°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 2% of September 23rd dates historically. The last decade has been 2.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.6°F warmer on this date compared to 20-30 years ago.
Planning for September 23rd 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 | 95° | 62° | 79° | — | — |
| 2024 | 93° | 57° | 75° | — | — |
| 2023 | 71° | 56° | 63° | — | — |
| 2022 | 86° | 57° | 72° | — | — |
| 2021 | 84° | 53° | 69° | — | — |
| 2020 | 79° | 59° | 69° | — | — |
| 2019 | 81° | 60° | 70° | — | — |
| 2018 | 76° | 53° | 64° | — | — |
| 2017 | 77° | 51° | 64° | — | — |
| 2016 | 76° | 52° | 64° | — | — |
| 2015 | 77° | 55° | 66° | — | — |
| 2014 | 79° | 65° | 72° | — | — |
| 2013 | 75° | 52° | 63° | — | — |
| 2012 | 77° | 53° | 65° | — | — |
| 2011 | 87° | 59° | 73° | — | — |
| 2010 | 78° | 53° | 66° | — | — |
| 2009 | 72° | 57° | 64° | — | — |
| 2008 | 87° | 54° | 70° | — | — |
| 2007 | 68° | 55° | 62° | — | — |
| 2006 | 77° | 56° | 66° | — | — |
| 2005 | 64° | 53° | 59° | — | — |
| 2004 | 87° | 58° | 72° | — | — |
| 2003 | 75° | 61° | 68° | — | — |
| 2002 | 84° | 59° | 72° | — | — |
| 2001 | 67° | 55° | 61° | — | — |
| 2000 | 75° | 55° | 65° | — | — |
| 1999 | 72° | 58° | 65° | — | — |
| 1998 | 70° | 56° | 63° | — | — |
| 1997warmest | 96° | 66° | 81° | — | — |
| 1996coldest | 66° | 49° | 57° | — | — |
| 1995 | 71° | 54° | 62° | — | — |
| 1994 | 76° | 55° | 65° | — | — |
| 1993 | 78° | 49° | 63° | — | — |
| 1992 | 76° | 56° | 66° | — | — |
| 1989 | 90° | 54° | 72° | — | — |
| 1988 | 75° | 47° | 61° | — | — |
| 1987 | 73° | 55° | 64° | — | — |
| 1986 | 75° | 54° | 64° | — | — |
| 1985 | 87° | 54° | 70° | — | — |
| 1984 | 82° | 52° | 67° | — | — |
| 1983 | 70° | 63° | 66° | — | — |
| 1982 | 75° | 54° | 64° | — | — |
| 1981 | 83° | 53° | 68° | — | — |
| 1980 | 86° | 53° | 70° | — | — |
| 1979 | 75° | 57° | 66° | — | — |
| 1978 | 89° | 49° | 69° | — | — |
| 1977 | 77° | 52° | 64° | — | — |
| 1976 | 70° | 52° | 61° | — | — |
| 1975 | 70° | 48° | 59° | — | — |
| 1974 | 67° | 51° | 59° | — | — |
| 1973 | 73° | 54° | 63° | 0.23" | — |
| 1972 | 73° | 46° | 60° | — | — |
| 1971 | 74° | 51° | 62° | — | — |
53 years of data from HAYWARD AIR TERMINAL