Weather on September 1
Riverside, CA
55 Years of Data
Avg High
95°F
Avg Low
63°F
Warmest
2017
94°F avg
Coldest
1999
67°F avg
About This Date
September 1st in Riverside, CA typically brings hot fall weather, with average highs around 95°F and lows near 63°F — a 32°F daily swing. Over 55 years of records, the warmest September 1st was in 2017 (94°F average), while the coldest was 1999 (67°F) — a 27°F range across recorded history. Rain or other precipitation has occurred on about 4% of September 1st dates historically, with the wettest September 1st recording 0.71" of rain. The last decade has been 2.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.7°F warmer on this date compared to 20-30 years ago.
Planning for September 1st in Riverside, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 98° | 69° | 84° | — | — |
| 2024 | 97° | 66° | 81° | — | — |
| 2023 | 92° | 67° | 79° | 0.71" | — |
| 2022 | 109° | 74° | 91° | — | — |
| 2021 | 80° | 63° | 71° | — | — |
| 2020 | 89° | 61° | 75° | — | — |
| 2019 | 100° | 68° | 84° | — | — |
| 2018 | 86° | 62° | 74° | — | — |
| 2017warmest | 112° | 76° | 94° | — | — |
| 2016 | 95° | 64° | 80° | — | — |
| 2015 | 88° | 66° | 77° | — | — |
| 2014 | 96° | 60° | 78° | — | — |
| 2013 | 99° | 71° | 85° | — | — |
| 2012 | 99° | 57° | 78° | — | — |
| 2011 | 96° | 59° | 78° | — | — |
| 2010 | 99° | 60° | 79° | — | — |
| 2009 | 102° | 73° | 88° | — | — |
| 2008 | 94° | 63° | 78° | — | — |
| 2007 | 112° | 74° | 93° | — | — |
| 2006 | 103° | 62° | 82° | — | — |
| 2005 | 95° | 55° | 75° | — | — |
| 2004 | 105° | 62° | 84° | — | — |
| 2003 | 95° | 64° | 80° | — | — |
| 2002 | 112° | 69° | 90° | — | — |
| 2001 | 96° | 61° | 78° | — | — |
| 2000 | 78° | 56° | 67° | — | — |
| 1999coldest | 79° | 56° | 67° | — | — |
| 1998 | 103° | 71° | 87° | — | — |
| 1997 | 98° | 63° | 80° | — | — |
| 1996 | 97° | 60° | 78° | — | — |
| 1995 | 100° | 65° | 82° | 0.03" | — |
| 1994 | 88° | 64° | 76° | — | — |
| 1993 | 94° | 65° | 79° | — | — |
| 1992 | 82° | 57° | 70° | — | — |
| 1991 | 101° | 61° | 81° | — | — |
| 1990 | 93° | 58° | 75° | — | — |
| 1989 | 94° | 50° | 72° | — | — |
| 1988 | 97° | 64° | 80° | — | — |
| 1987 | 106° | 67° | 86° | — | — |
| 1986 | 87° | 59° | 73° | — | — |
| 1985 | 101° | 64° | 82° | — | — |
| 1984 | 91° | 61° | 76° | — | — |
| 1983 | 94° | 67° | 80° | — | — |
| 1982 | 103° | 61° | 82° | — | — |
| 1981 | 94° | 59° | 76° | — | — |
| 1980 | 85° | 62° | 73° | — | — |
| 1979 | 90° | 60° | 75° | — | — |
| 1978 | 95° | 59° | 77° | — | — |
| 1977 | 87° | 57° | 72° | — | — |
| 1976 | 102° | 63° | 82° | — | — |
| 1975 | 95° | 54° | 74° | — | — |
| 1974 | 97° | 60° | 78° | — | — |
| 1973 | 85° | 53° | 69° | — | — |
| 1972 | 94° | — | — | — | — |
| 1971 | 87° | 57° | 72° | — | — |
55 years of data from RIVERSIDE CITRUS EXP