Weather on May 21
Hayward, CA
55 Years of Data
Avg High
70°F
Avg Low
51°F
Warmest
2000
78°F avg
Coldest
1974
52°F avg
About This Date
May 21st 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 21st was in 2000 (78°F average), while the coldest was 1974 (52°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 10% of May 21st dates historically, with the wettest May 21st recording 0.99" of rain. The last decade has been 1.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.0°F warmer on this date compared to 20-30 years ago.
Planning for May 21st in Hayward, CA? Great weather for outdoor activities.
Warming Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 81° | 53° | 67° | — | — |
| 2024 | 80° | 52° | 66° | — | — |
| 2023 | 72° | 54° | 63° | — | — |
| 2022 | 77° | 49° | 63° | — | — |
| 2021 | 64° | 49° | 56° | — | — |
| 2020 | 75° | 55° | 65° | — | — |
| 2019 | 64° | 53° | 59° | 0.99" | — |
| 2018 | 66° | 52° | 59° | — | — |
| 2017 | 85° | 56° | 70° | — | — |
| 2016 | 67° | 54° | 60° | 0.1" | — |
| 2015 | 65° | 55° | 60° | 0.03" | — |
| 2014 | 71° | 53° | 62° | — | — |
| 2013 | 66° | 53° | 60° | — | — |
| 2012 | 64° | 54° | 59° | — | — |
| 2011 | 64° | 54° | 59° | — | — |
| 2010 | 62° | 51° | 57° | — | — |
| 2009 | 72° | 49° | 60° | — | — |
| 2008 | 66° | 49° | 57° | — | — |
| 2007 | 72° | 52° | 62° | — | — |
| 2006 | 69° | 55° | 62° | 0.64" | — |
| 2005 | 71° | 52° | 61° | — | — |
| 2004 | 61° | 56° | 58° | — | — |
| 2003 | 78° | 55° | 67° | — | — |
| 2002 | 62° | 52° | 57° | 0.15" | — |
| 2001 | 83° | 56° | 69° | — | — |
| 2000warmest | 94° | 63° | 78° | — | — |
| 1999 | 70° | 47° | 58° | — | — |
| 1998 | 61° | 45° | 53° | — | — |
| 1997 | 73° | 50° | 62° | — | — |
| 1996 | 60° | 50° | 55° | — | — |
| 1995 | 59° | 56° | 57° | — | — |
| 1994 | 64° | 50° | 57° | — | — |
| 1993 | 67° | 52° | 59° | — | — |
| 1989 | 60° | 49° | 54° | — | — |
| 1988 | 91° | 58° | 74° | — | — |
| 1987 | 68° | 52° | 60° | — | — |
| 1986 | 67° | 45° | 56° | — | — |
| 1985 | 68° | 51° | 60° | — | — |
| 1984 | 70° | 50° | 60° | — | — |
| 1983 | 83° | 53° | 68° | — | — |
| 1982 | 68° | 48° | 58° | — | — |
| 1981 | 64° | 50° | 57° | — | — |
| 1980 | 75° | 52° | 63° | — | — |
| 1979 | 72° | 53° | 62° | — | — |
| 1978 | 69° | 52° | 60° | — | — |
| 1977 | 67° | 50° | 58° | — | — |
| 1976 | 72° | 42° | 57° | — | — |
| 1975 | 69° | 43° | 56° | — | — |
| 1974coldest | 62° | 42° | 52° | — | — |
| 1973 | 68° | 53° | 61° | — | — |
| 1972 | 65° | 50° | 57° | — | — |
| 1971 | 64° | 45° | 54° | — | — |
52 years of data from HAYWARD AIR TERMINAL