Weather on December 9
Riverside, CA
55 Years of Data
Avg High
69°F
Avg Low
42°F
Warmest
2025
66°F avg
Coldest
1972
40°F avg
About This Date
December 9th in Riverside, CA typically brings mild winter weather, with average highs around 69°F and lows near 42°F — a 27°F daily swing. Over 55 years of records, the warmest December 9th was in 2025 (66°F average), while the coldest was 1972 (40°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 13% of December 9th dates historically, with the wettest December 9th recording 0.76" of rain. The last decade has been 3.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.6°F warmer on this date compared to 20-30 years ago.
Planning for December 9th in Riverside, CA? Great weather for outdoor activities.
Warming Trend
1.1°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025warmest | 83° | 50° | 66° | — | — |
| 2024 | 74° | 44° | 59° | — | — |
| 2023 | 68° | 54° | 61° | — | — |
| 2022 | 63° | 38° | 50° | — | — |
| 2021 | 56° | 47° | 51° | 0.28" | — |
| 2020 | 76° | 47° | 61° | — | — |
| 2019 | 66° | 48° | 57° | — | — |
| 2018 | 72° | 47° | 59° | — | — |
| 2017 | 81° | 47° | 64° | — | — |
| 2016 | 65° | 44° | 54° | — | — |
| 2015 | 78° | 49° | 63° | — | — |
| 2014 | 80° | 50° | 65° | — | — |
| 2013 | 55° | 38° | 46° | — | — |
| 2012 | 71° | 43° | 57° | — | — |
| 2011 | 75° | 38° | 56° | — | — |
| 2010 | 72° | 44° | 58° | — | — |
| 2009 | 57° | 37° | 47° | — | — |
| 2008 | 68° | 47° | 57° | — | — |
| 2007 | 58° | 44° | 51° | 0.18" | — |
| 2006 | 66° | 45° | 55° | 0.53" | — |
| 2005 | 71° | 46° | 59° | 0.13" | — |
| 2004 | 70° | 46° | 58° | — | — |
| 2003 | 71° | 38° | 54° | — | — |
| 2002 | 69° | 43° | 56° | — | — |
| 2001 | 65° | 30° | 47° | — | — |
| 2000 | 66° | 52° | 59° | — | — |
| 1999 | 67° | 36° | 51° | — | — |
| 1998 | 62° | 48° | 55° | — | — |
| 1997 | 60° | 35° | 48° | — | — |
| 1996 | 72° | 46° | 59° | 0.76" | — |
| 1995 | 84° | 42° | 63° | — | — |
| 1994 | 69° | 34° | 51° | — | — |
| 1993 | 66° | 41° | 54° | — | — |
| 1992 | 62° | 39° | 51° | — | — |
| 1991 | 75° | 53° | 64° | 0.08" | — |
| 1990 | 85° | 39° | 62° | — | — |
| 1989 | 78° | 40° | 59° | — | — |
| 1988 | 73° | 56° | 64° | — | — |
| 1987 | 72° | 42° | 57° | — | — |
| 1986 | 68° | 34° | 51° | — | — |
| 1985 | 60° | 33° | 47° | — | — |
| 1984 | 70° | 40° | 55° | — | — |
| 1983 | 66° | 41° | 54° | 0.05" | — |
| 1982 | 62° | 52° | 57° | — | — |
| 1981 | 76° | 45° | 60° | — | — |
| 1980 | 67° | 35° | 51° | — | — |
| 1979 | 76° | 41° | 58° | — | — |
| 1978 | 61° | 27° | 44° | — | — |
| 1977 | 65° | 41° | 53° | — | — |
| 1976 | 67° | 34° | 50° | — | — |
| 1975 | 85° | 43° | 64° | — | — |
| 1974 | 69° | 40° | 54° | — | — |
| 1973 | 79° | 43° | 61° | — | — |
| 1972coldest | 51° | 28° | 40° | — | — |
| 1971 | 57° | 28° | 43° | — | — |
55 years of data from RIVERSIDE MUNI AP