Weather on May 20
Mission Viejo, CA
55 Years of Data
Avg High
74°F
Avg Low
55°F
Warmest
2017
77°F avg
Coldest
1975
54°F avg
About This Date
May 20th in Mission Viejo, CA typically brings pleasant spring weather, with average highs around 74°F and lows near 55°F. Over 55 years of records, the warmest May 20th was in 2017 (77°F average), while the coldest was 1975 (54°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 9% of May 20th dates historically. The last decade has been 3.1°F cooler on this date compared to 20-30 years ago.
The last decade has been 3.1°F cooler on this date compared to 20-30 years ago.
Planning for May 20th in Mission Viejo, CA? Great weather for outdoor activities.
Warming Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 89° | 57° | 73° | — | — |
| 2024 | 69° | 54° | 61° | — | — |
| 2023 | 67° | 57° | 62° | — | — |
| 2022 | 63° | 55° | 59° | — | — |
| 2021 | 68° | 53° | 61° | — | — |
| 2020 | 74° | 50° | 62° | — | — |
| 2019 | 65° | 51° | 58° | — | — |
| 2018 | 62° | 56° | 59° | — | — |
| 2017warmest | 92° | 63° | 77° | — | — |
| 2016 | 67° | 56° | 61° | — | — |
| 2015 | 70° | 53° | 61° | — | — |
| 2014 | 69° | 55° | 62° | — | — |
| 2013 | 80° | 54° | 67° | — | — |
| 2012 | 82° | 55° | 69° | — | — |
| 2011 | 70° | 49° | 59° | — | — |
| 2010 | 77° | 48° | 63° | — | — |
| 2009 | 85° | 52° | 68° | — | — |
| 2008 | 76° | 58° | 67° | — | — |
| 2007 | 72° | 55° | 63° | — | — |
| 2006 | 81° | 58° | 69° | — | — |
| 2005 | 89° | 56° | 72° | — | — |
| 2004 | 71° | 56° | 63° | — | — |
| 2003 | 86° | 53° | 70° | — | — |
| 2002 | 68° | 51° | 60° | — | — |
| 2001 | 78° | 55° | 67° | — | — |
| 2000 | 88° | 56° | 72° | — | — |
| 1999 | 70° | 56° | 63° | — | — |
| 1998 | 71° | 54° | 62° | — | — |
| 1997 | 75° | 63° | 69° | — | — |
| 1996 | 75° | 58° | 66° | — | — |
| 1995 | 68° | 56° | 62° | 0.05" | — |
| 1994 | 73° | 50° | 62° | — | — |
| 1993 | 74° | 63° | 68° | — | — |
| 1992 | 78° | 61° | 69° | — | — |
| 1991 | 71° | 52° | 61° | — | — |
| 1990 | 70° | 54° | 62° | — | — |
| 1989 | 77° | 56° | 66° | — | — |
| 1988 | 82° | 57° | 70° | — | — |
| 1987 | 61° | 52° | 56° | — | — |
| 1986 | 72° | 57° | 64° | — | — |
| 1985 | 72° | 59° | 65° | — | — |
| 1984 | 78° | 59° | 69° | — | — |
| 1983 | 82° | 58° | 70° | — | — |
| 1982 | 73° | 56° | 64° | — | — |
| 1981 | 68° | 53° | 61° | — | — |
| 1980 | 62° | 57° | 60° | — | — |
| 1979 | 66° | 57° | 62° | 0.05" | — |
| 1978 | 78° | 56° | 67° | — | — |
| 1977 | 78° | 53° | 66° | — | — |
| 1976 | 73° | 56° | 64° | — | — |
| 1975coldest | 59° | 49° | 54° | 0.38" | — |
| 1974 | 72° | 41° | 56° | — | — |
| 1973 | 64° | 54° | 59° | 0.03" | — |
| 1972 | 66° | 45° | 55° | 0.05" | — |
| 1971 | 80° | 53° | 67° | — | — |
55 years of data from EL TORO MCAS