Weather on May 15
Riverside, CA
55 Years of Data
Avg High
79°F
Avg Low
54°F
Warmest
2014
82°F avg
Coldest
1989
57°F avg
About This Date
May 15th in Riverside, CA typically brings pleasant spring weather, with average highs around 79°F and lows near 54°F — a 25°F daily swing. Over 55 years of records, the warmest May 15th was in 2014 (82°F average), while the coldest was 1989 (57°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 9% of May 15th dates historically, with the wettest May 15th recording 1.37" of rain. The last decade has been 1.4°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.4°F cooler on this date compared to 20-30 years ago.
Planning for May 15th in Riverside, CA? Great weather for outdoor activities.
Warming Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 81° | 53° | 67° | — | — |
| 2024 | 72° | 55° | 63° | — | — |
| 2023 | 84° | 57° | 71° | — | — |
| 2022 | 91° | 61° | 76° | — | — |
| 2021 | 72° | 57° | 64° | — | — |
| 2020 | 83° | 55° | 69° | — | — |
| 2019 | 74° | 57° | 65° | — | — |
| 2018 | 77° | 52° | 64° | — | — |
| 2017 | 68° | 51° | 60° | — | — |
| 2016 | 71° | 59° | 65° | — | — |
| 2015 | 64° | 51° | 58° | 1.37" | — |
| 2014warmest | 103° | 61° | 82° | — | — |
| 2013 | 83° | 56° | 69° | — | — |
| 2012 | 86° | 52° | 69° | — | — |
| 2011 | 66° | 50° | 58° | 0.1" | — |
| 2010 | 85° | 53° | 69° | — | — |
| 2009 | 90° | 54° | 72° | — | — |
| 2008 | 97° | 59° | 78° | — | — |
| 2007 | 80° | 53° | 67° | — | — |
| 2006 | 87° | 59° | 73° | — | — |
| 2005 | 88° | 58° | 73° | — | — |
| 2004 | 90° | 54° | 72° | — | — |
| 2003 | 80° | 49° | 64° | — | — |
| 2002 | 78° | 53° | 66° | — | — |
| 2001 | 83° | 52° | 67° | — | — |
| 2000 | 77° | 50° | 64° | — | — |
| 1999 | 72° | 54° | 63° | — | — |
| 1998 | 75° | 46° | 61° | — | — |
| 1997 | 96° | 57° | 77° | — | — |
| 1996 | 83° | 60° | 71° | — | — |
| 1995 | 72° | 49° | 60° | 0.03" | — |
| 1994 | 65° | 58° | 61° | — | — |
| 1993 | 89° | 59° | 74° | 0.08" | — |
| 1992 | 78° | 57° | 68° | — | — |
| 1991 | 87° | 47° | 67° | — | — |
| 1990 | 72° | 56° | 64° | — | — |
| 1989coldest | 60° | 54° | 57° | 0.28" | — |
| 1988 | 87° | 54° | 70° | — | — |
| 1987 | 79° | 60° | 69° | — | — |
| 1986 | 72° | 55° | 63° | — | — |
| 1985 | 85° | 51° | 68° | — | — |
| 1984 | 73° | 50° | 62° | — | — |
| 1983 | 79° | 50° | 64° | — | — |
| 1982 | 78° | 49° | 63° | — | — |
| 1981 | 70° | 58° | 64° | — | — |
| 1980 | 69° | 52° | 60° | — | — |
| 1979 | 85° | 53° | 69° | — | — |
| 1978 | 90° | 57° | 73° | — | — |
| 1977 | 64° | 55° | 60° | — | — |
| 1976 | 97° | 58° | 77° | — | — |
| 1975 | 69° | 55° | 62° | — | — |
| 1974 | 68° | 56° | 62° | — | — |
| 1973 | 72° | 53° | 62° | — | — |
| 1972 | 99° | 53° | 76° | — | — |
| 1971 | 77° | 54° | 65° | — | — |
55 years of data from RIVERSIDE CITRUS EXP