Weather on December 21
Oceanside, CA
55 Years of Data
About This Date
December 21st in Oceanside, CA typically brings mild winter weather, with average highs around 65°F and lows near 42°F. Over 53 years of records, the warmest December 21st was in 1972 (63°F average), while the coldest was 2012 (45°F) — a 18°F range across recorded history. Rain or other precipitation has occurred on about 21% of December 21st dates historically, with the wettest December 21st recording 7.54" of rain. The last decade has been 2.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.5°F warmer on this date compared to 20-30 years ago.
Planning for December 21st in Oceanside, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 67° | 51° | 59° | — | — |
| 2024 | 65° | 36° | 50° | — | — |
| 2023 | 71° | 53° | 62° | 0.51" | — |
| 2022 | 69° | 33° | 51° | — | — |
| 2021 | 66° | 44° | 55° | — | — |
| 2020 | 78° | 41° | 60° | — | — |
| 2019 | 73° | 40° | 56° | — | — |
| 2018 | 66° | 43° | 54° | — | — |
| 2017 | 60° | 32° | 46° | — | — |
| 2016 | 68° | 55° | 62° | 1.83" | — |
| 2015 | 63° | 36° | 49° | 0.18" | — |
| 2014 | 67° | 46° | 56° | — | — |
| 2013 | 62° | 38° | 50° | — | — |
| 2012coldest | 61° | 29° | 45° | — | — |
| 2011 | 62° | 35° | 49° | — | — |
| 2010 | 61° | 54° | 57° | 7.54" | — |
| 2009 | 66° | 43° | 54° | — | — |
| 2008 | 61° | 38° | 49° | 0.03" | — |
| 2007 | 64° | 38° | 51° | 0.05" | — |
| 2006 | 62° | 36° | 49° | — | — |
| 2005 | 80° | 44° | 62° | — | — |
| 2004 | 65° | 42° | 53° | — | — |
| 2003 | 66° | 43° | 54° | — | — |
| 2002 | 57° | 44° | 51° | 0.56" | — |
| 2001 | 59° | 42° | 51° | 0.41" | — |
| 2000 | 62° | 31° | 46° | — | — |
| 1999 | 74° | 31° | 52° | — | — |
| 1998 | 60° | 38° | 49° | — | — |
| 1997 | 73° | 44° | 59° | 0.43" | — |
| 1996 | 59° | 47° | 53° | — | — |
| 1995 | 62° | 42° | 52° | — | — |
| 1994 | 62° | 40° | 51° | — | — |
| 1993 | 64° | 46° | 55° | — | — |
| 1992 | 61° | 37° | 49° | — | — |
| 1991 | 71° | 46° | 59° | — | — |
| 1990 | 53° | 40° | 46° | — | — |
| 1989 | 61° | 42° | 51° | — | — |
| 1988 | 59° | 53° | 56° | — | — |
| 1987 | 61° | 40° | 50° | — | — |
| 1985 | 70° | 46° | 58° | — | — |
| 1984 | 60° | 41° | 51° | — | — |
| 1983 | 61° | 46° | 53° | — | — |
| 1982 | 65° | 50° | 57° | — | — |
| 1981 | 63° | 43° | 53° | — | — |
| 1980 | 62° | 43° | 52° | — | — |
| 1979 | 62° | 52° | 57° | 0.41" | — |
| 1977 | 68° | 40° | 54° | — | — |
| 1976 | 74° | 40° | 57° | — | — |
| 1975 | 62° | 44° | 53° | 0.18" | — |
| 1974 | 61° | 42° | 51° | — | — |
| 1973 | 66° | 44° | 55° | — | — |
| 1972warmest | 76° | 50° | 63° | — | — |
| 1971 | 59° | 40° | 49° | — | — |
Oceanside, CA Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Oceanside, CA Monthly Precipitation
Average rainfall per month, in inches.
Oceanside, 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 Oceanside, CA
Most pleasant months in Oceanside, CA: June, July.