Weather on September 18
Hayward, CA
55 Years of Data
Avg High
75°F
Avg Low
56°F
Warmest
1984
83°F avg
Coldest
1972
59°F avg
About This Date
September 18th in Hayward, CA typically brings pleasant fall weather, with average highs around 75°F and lows near 56°F. Over 53 years of records, the warmest September 18th was in 1984 (83°F average), while the coldest was 1972 (59°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 15% of September 18th dates historically, with the wettest September 18th recording 1.04" 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 18th 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 | 72° | 60° | 66° | 0.1" | — |
| 2024 | 74° | 61° | 67° | — | — |
| 2023 | 75° | 63° | 69° | — | — |
| 2022 | 71° | 62° | 67° | 0.53" | — |
| 2021 | 71° | 58° | 64° | — | — |
| 2020 | 76° | 64° | 70° | — | — |
| 2019 | 74° | 60° | 67° | 0.03" | — |
| 2018 | 72° | 56° | 64° | — | — |
| 2017 | 73° | 60° | 67° | — | — |
| 2016 | 89° | 57° | 73° | — | — |
| 2015 | 79° | 54° | 66° | — | — |
| 2014 | 80° | 66° | 73° | — | — |
| 2013 | 77° | 52° | 64° | — | — |
| 2012 | 67° | 54° | 60° | — | — |
| 2011 | 87° | 55° | 71° | — | — |
| 2010 | 74° | 62° | 68° | 0.13" | — |
| 2009 | 91° | 63° | 77° | — | — |
| 2008 | 69° | 51° | 60° | — | — |
| 2007 | 68° | 57° | 63° | — | — |
| 2006 | 82° | 58° | 70° | — | — |
| 2005 | 74° | 53° | 63° | — | — |
| 2004 | 66° | 57° | 62° | — | — |
| 2003 | 88° | 57° | 72° | — | — |
| 2002 | 84° | 58° | 71° | — | — |
| 2001 | 68° | 55° | 62° | — | — |
| 2000 | 93° | 66° | 80° | — | — |
| 1999 | 67° | 55° | 61° | — | — |
| 1998 | 75° | 54° | 64° | — | — |
| 1997 | 74° | 56° | 65° | — | — |
| 1996 | 81° | 61° | 71° | — | — |
| 1995 | 88° | 61° | 74° | — | — |
| 1994 | 71° | 52° | 61° | — | — |
| 1993 | 68° | 51° | 60° | — | — |
| 1992 | 75° | 52° | 63° | — | — |
| 1989 | 67° | 56° | 61° | 0.38" | — |
| 1988 | 82° | 50° | 66° | — | — |
| 1987 | 78° | 52° | 65° | — | — |
| 1986 | 70° | 53° | 61° | 1.04" | — |
| 1985 | 67° | 51° | 59° | 0.48" | — |
| 1984warmest | 98° | 68° | 83° | — | — |
| 1983 | 75° | 56° | 65° | — | — |
| 1982 | 70° | 58° | 64° | 0.05" | — |
| 1981 | 74° | 58° | 66° | — | — |
| 1980 | 77° | 55° | 66° | — | — |
| 1979 | 76° | 58° | 67° | — | — |
| 1978 | 72° | 47° | 59° | — | — |
| 1977 | 72° | 56° | 64° | — | — |
| 1976 | 76° | 53° | 64° | — | — |
| 1975 | 70° | 50° | 60° | — | — |
| 1974 | 78° | 52° | 65° | — | — |
| 1973 | 66° | 53° | 60° | — | — |
| 1972coldest | 67° | 51° | 59° | — | — |
| 1971 | 70° | 54° | 62° | — | — |
53 years of data from HAYWARD AIR TERMINAL