Weather on May 20
San Mateo, CA
55 Years of Data
Avg High
69°F
Avg Low
51°F
Warmest
1988
72°F avg
Coldest
1999
54°F avg
About This Date
May 20th in San Mateo, CA typically brings mild spring weather, with average highs around 69°F and lows near 51°F. Over 55 years of records, the warmest May 20th was in 1988 (72°F average), while the coldest was 1999 (54°F) — a 18°F range across recorded history. Rain or other precipitation has occurred on about 7% of May 20th dates historically, with the wettest May 20th recording 0.81" 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 May 20th in San Mateo, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 65° | 51° | 58° | — | — |
| 2024 | 72° | 52° | 62° | — | — |
| 2023 | 63° | 54° | 58° | — | — |
| 2022 | 73° | 50° | 62° | — | — |
| 2021 | 65° | 50° | 57° | — | — |
| 2020 | 67° | 55° | 61° | — | — |
| 2019 | 64° | 48° | 56° | 0.05" | — |
| 2018 | 62° | 54° | 58° | — | — |
| 2017 | 87° | 52° | 69° | — | — |
| 2016 | 62° | 52° | 57° | — | — |
| 2015 | 62° | 55° | 59° | — | — |
| 2014 | 71° | 56° | 63° | — | — |
| 2013 | 83° | 52° | 67° | — | — |
| 2012 | 72° | 52° | 62° | — | — |
| 2011 | 64° | 50° | 57° | — | — |
| 2010 | 65° | 50° | 57° | — | — |
| 2009 | 64° | 50° | 57° | — | — |
| 2008 | 66° | 51° | 59° | — | — |
| 2007 | 64° | 51° | 58° | — | — |
| 2006 | 73° | 53° | 63° | — | — |
| 2005 | 69° | 56° | 62° | — | — |
| 2004 | 63° | 53° | 58° | — | — |
| 2003 | 81° | 53° | 67° | — | — |
| 2002 | 61° | 52° | 56° | 0.81" | — |
| 2001 | 77° | 53° | 65° | — | — |
| 2000 | 79° | 53° | 66° | — | — |
| 1999coldest | 60° | 49° | 54° | — | — |
| 1998 | 63° | 50° | 56° | — | — |
| 1997 | 69° | 56° | 62° | — | — |
| 1996 | 65° | 52° | 58° | — | — |
| 1995 | 63° | 48° | 55° | — | — |
| 1994 | 64° | 52° | 58° | — | — |
| 1993 | 73° | 60° | 67° | — | — |
| 1992 | 71° | 55° | 63° | — | — |
| 1991 | 66° | 50° | 58° | — | — |
| 1990 | 64° | 56° | 60° | 0.25" | — |
| 1989 | 62° | 48° | 55° | — | — |
| 1988warmest | 93° | 52° | 72° | — | — |
| 1987 | 68° | 54° | 61° | 0.05" | — |
| 1986 | 64° | 51° | 58° | — | — |
| 1985 | 67° | 52° | 59° | — | — |
| 1984 | 67° | 52° | 59° | — | — |
| 1983 | 81° | 53° | 67° | — | — |
| 1982 | 65° | 45° | 55° | — | — |
| 1981 | 67° | 51° | 59° | — | — |
| 1980 | 67° | 51° | 59° | — | — |
| 1979 | 68° | 53° | 61° | — | — |
| 1978 | 84° | 52° | 68° | — | — |
| 1977 | 67° | 45° | 56° | — | — |
| 1976 | 78° | 41° | 60° | — | — |
| 1975 | 70° | 47° | 58° | — | — |
| 1974 | — | 50° | — | — | — |
| 1973 | 64° | 51° | 58° | — | — |
| 1972 | 63° | 48° | 55° | — | — |
| 1971 | 68° | 43° | 55° | — | — |
55 years of data from BURLINGAME