Weather on March 21
Oceanside, CA
55 Years of Data
Avg High
66°F
Avg Low
48°F
Warmest
2026
65°F avg
Coldest
1999
49°F avg
About This Date
March 21st in Oceanside, CA typically brings mild spring weather, with average highs around 66°F and lows near 48°F. Over 56 years of records, the warmest March 21st was in 2026 (65°F average), while the coldest was 1999 (49°F) — a 16°F range across recorded history. Rain or other precipitation has occurred on about 23% of March 21st dates historically, with the wettest March 21st recording 4.22" 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 March 21st in Oceanside, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026warmest | 80° | 50° | 65° | — | — |
| 2025 | 66° | 39° | 53° | — | — |
| 2024 | 68° | 49° | 58° | — | — |
| 2023 | 63° | 53° | 58° | 4.22" | — |
| 2022 | 67° | 42° | 54° | — | — |
| 2021 | 63° | 41° | 52° | — | — |
| 2020 | 66° | 48° | 57° | — | — |
| 2019 | 63° | 44° | 53° | 0.05" | — |
| 2018 | 74° | 46° | 60° | — | — |
| 2017 | 70° | 48° | 59° | — | — |
| 2016 | 67° | 49° | 58° | — | — |
| 2015 | 70° | 58° | 64° | — | — |
| 2014 | 68° | 51° | 60° | — | — |
| 2013 | 68° | 48° | 58° | — | — |
| 2012 | 69° | 38° | 53° | — | — |
| 2011 | 60° | 45° | 52° | 0.43" | — |
| 2010 | 69° | 43° | 56° | 0.03" | — |
| 2009 | 64° | 54° | 59° | — | — |
| 2008 | 69° | 40° | 54° | — | — |
| 2007 | 63° | 49° | 56° | 0.2" | — |
| 2006 | 57° | 42° | 50° | 0.51" | — |
| 2005 | 66° | 48° | 57° | — | — |
| 2004 | 65° | 57° | 61° | — | — |
| 2003 | 64° | 46° | 55° | — | — |
| 2002 | 70° | 39° | 54° | — | — |
| 2001 | 62° | 54° | 58° | — | — |
| 2000 | 68° | 43° | 55° | — | — |
| 1999coldest | 58° | 41° | 49° | — | — |
| 1998 | 63° | 52° | 57° | — | — |
| 1997 | 69° | 48° | 59° | — | — |
| 1996 | 62° | 56° | 59° | — | — |
| 1995 | 63° | 51° | 57° | 0.89" | — |
| 1994 | 69° | 47° | 58° | — | — |
| 1993 | 64° | 58° | 61° | — | — |
| 1992 | 62° | 58° | 60° | 0.97" | — |
| 1991 | 56° | 45° | 50° | 0.94" | — |
| 1990 | 83° | 46° | 64° | — | — |
| 1989 | 68° | 47° | 57° | — | — |
| 1988 | 68° | 48° | 58° | — | — |
| 1987 | 58° | 43° | 50° | 0.89" | — |
| 1986 | 70° | 50° | 60° | — | — |
| 1985 | 60° | 44° | 52° | — | — |
| 1984 | 69° | 49° | 59° | — | — |
| 1983 | 63° | 45° | 54° | 1.88" | — |
| 1982 | 66° | 44° | 55° | — | — |
| 1981 | 63° | 44° | 53° | — | — |
| 1980 | 64° | 54° | 59° | — | — |
| 1979 | 61° | 49° | 55° | 0.2" | — |
| 1978 | 66° | 58° | 62° | — | — |
| 1977 | 68° | 49° | 58° | — | — |
| 1976 | 77° | 42° | 60° | — | — |
| 1975 | 64° | 43° | 53° | — | — |
| 1974 | 67° | 51° | 59° | — | — |
| 1973 | 63° | 49° | 56° | 0.03" | — |
| 1972 | 68° | 55° | 62° | — | — |
| 1971 | 63° | — | — | — | — |
56 years of data from OCEANSIDE MUNI AP