Weather on September 18
Hayward, CA
55 Years of Data
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.
| 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° | — | — |
Hayward, CA Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Hayward, CA Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Hayward, CA Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Hayward, CA
Most pleasant months in Hayward, CA: August.