Weather on March 21
Riverside, CA
55 Years of Data
Avg High
72°F
Avg Low
48°F
Warmest
2026
77°F avg
Coldest
1987
47°F avg
About This Date
March 21st in Riverside, CA typically brings pleasant spring weather, with average highs around 72°F and lows near 48°F. Over 56 years of records, the warmest March 21st was in 2026 (77°F average), while the coldest was 1987 (47°F) — a 30°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 2.74" of rain. The last decade has been 1.9°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.9°F cooler on this date compared to 20-30 years ago.
Planning for March 21st in Riverside, CA? Great weather for outdoor activities.
Warming Trend
1.0°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026warmest | 93° | 61° | 77° | — | — |
| 2025 | 80° | 46° | 63° | — | — |
| 2024 | 73° | 51° | 62° | — | — |
| 2023 | 61° | 46° | 53° | 2.74" | — |
| 2022 | 83° | 47° | 65° | — | — |
| 2021 | 66° | 43° | 54° | — | — |
| 2020 | 67° | 46° | 56° | — | — |
| 2019 | 59° | 45° | 52° | — | — |
| 2018 | 70° | 52° | 61° | — | — |
| 2017 | 68° | 53° | 61° | 0.28" | — |
| 2016 | 74° | 51° | 62° | — | — |
| 2015 | 81° | 52° | 66° | — | — |
| 2014 | 83° | 46° | 64° | — | — |
| 2013 | 74° | 51° | 62° | — | — |
| 2012 | 80° | 44° | 62° | — | — |
| 2011 | 54° | 42° | 48° | 0.48" | — |
| 2010 | 79° | 51° | 65° | — | — |
| 2009 | 69° | 52° | 60° | — | — |
| 2008 | 81° | 46° | 63° | — | — |
| 2007 | 69° | 50° | 60° | — | — |
| 2006 | 60° | 43° | 51° | 0.58" | — |
| 2005 | 67° | 49° | 58° | — | — |
| 2004 | 83° | 50° | 66° | — | — |
| 2003 | 78° | 46° | 62° | — | — |
| 2002 | 87° | 45° | 66° | — | — |
| 2001 | 76° | 47° | 61° | — | — |
| 2000 | 71° | 53° | 62° | — | — |
| 1999 | 68° | 40° | 54° | — | — |
| 1998 | 72° | 50° | 61° | — | — |
| 1997 | 89° | 54° | 71° | — | — |
| 1996 | 75° | 51° | 63° | — | — |
| 1995 | 58° | 49° | 53° | 1.04" | — |
| 1994 | 72° | 47° | 59° | — | — |
| 1993 | 75° | 49° | 62° | — | — |
| 1992 | 63° | 51° | 57° | 0.48" | — |
| 1991 | 58° | 42° | 50° | 0.15" | — |
| 1990 | 87° | 50° | 69° | — | — |
| 1989 | 84° | 45° | 64° | — | — |
| 1988 | 82° | 46° | 64° | — | — |
| 1987coldest | 54° | 40° | 47° | 1.27" | — |
| 1986 | 86° | 49° | 67° | — | — |
| 1985 | 68° | 46° | 57° | — | — |
| 1984 | 79° | 49° | 64° | — | — |
| 1983 | 58° | 47° | 52° | 0.81" | — |
| 1982 | 65° | 40° | 52° | — | — |
| 1981 | 63° | 46° | 54° | — | — |
| 1980 | 65° | 45° | 55° | 0.23" | — |
| 1979 | 58° | 48° | 53° | 0.2" | — |
| 1978 | 68° | 54° | 61° | 0.23" | — |
| 1977 | 70° | 43° | 56° | — | — |
| 1976 | 78° | 42° | 60° | — | — |
| 1975 | 70° | 49° | 59° | — | — |
| 1974 | 61° | 52° | 56° | — | — |
| 1973 | 56° | 43° | 49° | 0.69" | — |
| 1972 | 73° | 48° | 61° | — | — |
| 1971 | 74° | 41° | 57° | — | — |
56 years of data from RIVERSIDE CITRUS EXP