Weather on May 21
Hayward, CA
55 Years of Data
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 53 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 9% of May 21st dates historically, with the wettest May 21st recording 0.99" 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 21st in Hayward, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 79° | 51° | 65° | — | — |
| 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° | — | — |
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.