Weather on April 21
Riverside, CA
55 Years of Data
Avg High
78°F
Avg Low
50°F
Warmest
2009
82°F avg
Coldest
2001
52°F avg
About This Date
April 21st in Riverside, CA typically brings pleasant spring weather, with average highs around 78°F and lows near 50°F — a 28°F daily swing. Over 55 years of records, the warmest April 21st was in 2009 (82°F average), while the coldest was 2001 (52°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 9% of April 21st dates historically, with the wettest April 21st recording 0.86" of rain. The last decade has been 4.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.5°F warmer on this date compared to 20-30 years ago.
Planning for April 21st in Riverside, CA? Great weather for outdoor activities.
Warming Trend
0.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 79° | 50° | 64° | — | — |
| 2024 | 84° | 52° | 68° | — | — |
| 2023 | 91° | 53° | 72° | — | — |
| 2022 | 73° | 47° | 60° | — | — |
| 2021 | 68° | 55° | 62° | — | — |
| 2020 | 74° | 53° | 63° | — | — |
| 2019 | 72° | 53° | 62° | — | — |
| 2018 | 91° | 49° | 70° | — | — |
| 2017 | 95° | 55° | 75° | — | — |
| 2016 | 87° | 55° | 71° | — | — |
| 2015 | 67° | 56° | 61° | — | — |
| 2014 | 89° | 55° | 72° | — | — |
| 2013 | 88° | 55° | 71° | — | — |
| 2012 | 92° | 57° | 74° | — | — |
| 2011 | 71° | 55° | 63° | — | — |
| 2010 | 61° | 46° | 53° | 0.15" | — |
| 2009warmest | 101° | 63° | 82° | — | — |
| 2008 | 69° | 48° | 59° | — | — |
| 2007 | 63° | 42° | 52° | — | — |
| 2006 | 73° | 52° | 62° | — | — |
| 2005 | 84° | 44° | 64° | — | — |
| 2004 | 73° | 49° | 61° | — | — |
| 2003 | 66° | 49° | 57° | — | — |
| 2002 | 83° | 42° | 62° | — | — |
| 2001coldest | 62° | 42° | 52° | 0.58" | — |
| 2000 | 68° | 50° | 59° | — | — |
| 1999 | 70° | 53° | 61° | — | — |
| 1998 | 95° | 54° | 74° | — | — |
| 1997 | 87° | 55° | 71° | — | — |
| 1996 | 75° | 47° | 61° | — | — |
| 1995 | 70° | 42° | 56° | — | — |
| 1994 | 77° | 58° | 67° | — | — |
| 1993 | 89° | 53° | 71° | — | — |
| 1992 | 84° | 54° | 69° | — | — |
| 1991 | 69° | 53° | 61° | 0.18" | — |
| 1990 | 77° | 57° | 67° | — | — |
| 1989 | 84° | 56° | 70° | — | — |
| 1988 | 64° | 48° | 56° | 0.03" | — |
| 1987 | 95° | 57° | 76° | — | — |
| 1986 | 90° | 49° | 69° | — | — |
| 1985 | 62° | 48° | 55° | — | — |
| 1984 | 88° | 47° | 67° | — | — |
| 1983 | 68° | 52° | 60° | 0.86" | — |
| 1982 | 78° | 48° | 63° | — | — |
| 1981 | 83° | 45° | 64° | — | — |
| 1980 | 70° | 57° | 63° | — | — |
| 1979 | 83° | 45° | 64° | — | — |
| 1978 | 71° | 47° | 59° | — | — |
| 1977 | 85° | 45° | 65° | — | — |
| 1976 | 86° | 50° | 68° | — | — |
| 1975 | 76° | 45° | 60° | — | — |
| 1974 | 85° | 44° | 64° | — | — |
| 1973 | 79° | 43° | 61° | — | — |
| 1972 | 83° | 36° | 59° | — | — |
| 1971 | 64° | 46° | 55° | — | — |
55 years of data from RIVERSIDE MUNI AP