Weather on October 21
Riverside, CA
55 Years of Data
Avg High
81°F
Avg Low
54°F
Warmest
2003
79°F avg
Coldest
1972
58°F avg
About This Date
October 21st in Riverside, CA typically brings warm fall weather, with average highs around 81°F and lows near 54°F — a 27°F daily swing. Over 55 years of records, the warmest October 21st was in 2003 (79°F average), while the coldest was 1972 (58°F) — a 21°F range across recorded history. Rain or other precipitation has occurred on about 9% of October 21st dates historically. The last decade has been 5.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.9°F warmer on this date compared to 20-30 years ago.
Planning for October 21st in Riverside, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 91° | 55° | 73° | — | — |
| 2024 | 90° | 55° | 72° | — | — |
| 2023 | 90° | 61° | 75° | — | — |
| 2022 | 85° | 59° | 72° | — | — |
| 2021 | 84° | 48° | 66° | — | — |
| 2020 | 79° | 60° | 69° | — | — |
| 2019 | 94° | 56° | 75° | — | — |
| 2018 | 85° | 57° | 71° | — | — |
| 2017 | 85° | 53° | 69° | — | — |
| 2016 | 96° | 58° | 77° | — | — |
| 2015 | 86° | 58° | 72° | — | — |
| 2014 | 82° | 58° | 70° | — | — |
| 2013 | 84° | 51° | 68° | — | — |
| 2012 | 74° | 61° | 67° | — | — |
| 2011 | 78° | 58° | 68° | — | — |
| 2010 | 65° | 59° | 62° | 0.03" | — |
| 2009 | 85° | 52° | 68° | — | — |
| 2008 | 94° | 52° | 73° | — | — |
| 2007 | 83° | 53° | 68° | — | — |
| 2006 | 92° | 46° | 69° | — | — |
| 2005 | 77° | 57° | 67° | — | — |
| 2004 | 67° | 52° | 59° | 0.36" | — |
| 2003warmest | 103° | 56° | 79° | — | — |
| 2002 | 67° | 54° | 60° | — | — |
| 2001 | 74° | 56° | 65° | — | — |
| 2000 | 71° | 59° | 65° | 0.05" | — |
| 1999 | 96° | 50° | 73° | — | — |
| 1998 | 82° | 47° | 64° | — | — |
| 1997 | 75° | 57° | 66° | — | — |
| 1996 | 72° | 52° | 62° | — | — |
| 1995 | 72° | 55° | 63° | — | — |
| 1994 | 83° | 47° | 65° | — | — |
| 1993 | 87° | 51° | 69° | — | — |
| 1992 | 78° | 63° | 70° | — | — |
| 1991 | 84° | 61° | 72° | — | — |
| 1990 | 88° | 48° | 68° | — | — |
| 1989 | 74° | 59° | 66° | 0.03" | — |
| 1988 | 83° | 59° | 71° | — | — |
| 1987 | 83° | 56° | 69° | — | — |
| 1986 | 85° | 44° | 64° | — | — |
| 1985 | 73° | 56° | 64° | — | — |
| 1984 | 73° | 47° | 60° | — | — |
| 1983 | 91° | 53° | 72° | — | — |
| 1982 | 81° | 52° | 66° | — | — |
| 1981 | 82° | 49° | 65° | — | — |
| 1980 | 88° | 48° | 68° | — | — |
| 1979 | 75° | 46° | 61° | — | — |
| 1978 | 78° | 45° | 61° | 0.25" | — |
| 1977 | 72° | 57° | 64° | — | — |
| 1976 | 79° | 63° | 71° | — | — |
| 1975 | 73° | 51° | 62° | — | — |
| 1974 | 70° | 56° | 63° | — | — |
| 1973 | 78° | 53° | 66° | — | — |
| 1972coldest | 72° | 45° | 58° | — | — |
| 1971 | 81° | 42° | 61° | — | — |
55 years of data from RIVERSIDE MUNI AP