Weather on May 18
Hayward, CA
55 Years of Data
Avg High
70°F
Avg Low
51°F
Warmest
1978
71°F avg
Coldest
1974
46°F avg
About This Date
May 18th in Hayward, CA typically brings pleasant spring weather, with average highs around 70°F and lows near 51°F. Over 52 years of records, the warmest May 18th was in 1978 (71°F average), while the coldest was 1974 (46°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 10% of May 18th dates historically, with the wettest May 18th recording 1.5" of rain. The last decade has been 1.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.2°F warmer on this date compared to 20-30 years ago.
Planning for May 18th in Hayward, CA? Great weather for outdoor activities.
Warming Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 72° | 52° | 62° | — | — |
| 2024 | 72° | 58° | 65° | — | — |
| 2023 | 64° | 54° | 59° | — | — |
| 2022 | 79° | 50° | 64° | — | — |
| 2021 | 68° | 53° | 61° | — | — |
| 2020 | 67° | 57° | 62° | 0.56" | — |
| 2019 | 57° | 51° | 54° | 1.5" | — |
| 2018 | 63° | 55° | 59° | — | — |
| 2017 | 78° | 50° | 64° | — | — |
| 2016 | 81° | 58° | 69° | — | — |
| 2015 | 60° | 54° | 57° | — | — |
| 2014 | 66° | 51° | 59° | — | — |
| 2013 | 68° | 54° | 61° | — | — |
| 2012 | 72° | 49° | 60° | — | — |
| 2011 | 65° | 52° | 58° | 0.03" | — |
| 2010 | 69° | 55° | 62° | 0.15" | — |
| 2009 | 68° | 54° | 61° | — | — |
| 2008 | 72° | 52° | 62° | — | — |
| 2007 | 65° | 51° | 58° | — | — |
| 2006 | 70° | 53° | 61° | — | — |
| 2005 | 69° | 59° | 64° | — | — |
| 2004 | 65° | 54° | 59° | — | — |
| 2003 | 71° | 50° | 61° | — | — |
| 2002 | 61° | 51° | 56° | — | — |
| 2001 | 74° | 54° | 64° | — | — |
| 2000 | 76° | 53° | 64° | — | — |
| 1999 | 63° | 52° | 57° | — | — |
| 1998 | 67° | 47° | 57° | — | — |
| 1997 | 82° | 56° | 69° | — | — |
| 1996 | 63° | 50° | 56° | — | — |
| 1995 | 73° | 56° | 64° | — | — |
| 1994 | 63° | 49° | 56° | — | — |
| 1993 | 73° | 50° | 62° | — | — |
| 1989 | 62° | 50° | 56° | — | — |
| 1988 | 68° | 45° | 56° | — | — |
| 1987 | 68° | 53° | 61° | — | — |
| 1986 | 87° | 40° | 63° | — | — |
| 1985 | 67° | 50° | 58° | — | — |
| 1984 | 70° | 48° | 59° | — | — |
| 1983 | 84° | 51° | 68° | — | — |
| 1982 | 65° | 44° | 54° | — | — |
| 1981 | 68° | 50° | 59° | 0.23" | — |
| 1980 | 77° | 48° | 63° | — | — |
| 1979 | 78° | 50° | 64° | — | — |
| 1978warmest | 86° | 56° | 71° | — | — |
| 1977 | 65° | 42° | 53° | — | — |
| 1976 | 62° | 42° | 52° | — | — |
| 1975 | 80° | 47° | 63° | — | — |
| 1974coldest | 58° | 35° | 46° | — | — |
| 1973 | 65° | 53° | 59° | — | — |
| 1972 | 65° | 47° | 56° | — | — |
| 1971 | 73° | 46° | 60° | — | — |
52 years of data from HAYWARD AIR TERMINAL