Weather on September 21
Temecula, CA
55 Years of Data
Avg High
86°F
Avg Low
58°F
Warmest
2021
85°F avg
Coldest
2000
60°F avg
About This Date
September 21st in Temecula, CA typically brings warm fall weather, with average highs around 86°F and lows near 58°F — a 28°F daily swing. Over 53 years of records, the warmest September 21st was in 2021 (85°F average), while the coldest was 2000 (60°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 6% of September 21st dates historically. The last decade has been 2.3°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.3°F cooler on this date compared to 20-30 years ago.
Planning for September 21st in Temecula, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 74° | 62° | 68° | 0.05" | — |
| 2024 | 82° | 58° | 70° | — | — |
| 2023 | 74° | 58° | 66° | — | — |
| 2022 | 86° | 59° | 73° | — | — |
| 2021warmest | 105° | 65° | 85° | — | — |
| 2020 | 87° | 56° | 71° | — | — |
| 2019 | 89° | 59° | 74° | — | — |
| 2018 | 87° | 58° | 72° | — | — |
| 2017 | 69° | 55° | 62° | 0.03" | — |
| 2016 | 83° | 65° | 74° | — | — |
| 2015 | 82° | 69° | 76° | — | — |
| 2014 | 85° | 62° | 73° | — | — |
| 2013 | 79° | 59° | 69° | — | — |
| 2012 | 95° | 64° | 80° | — | — |
| 2011 | 85° | 55° | 70° | — | — |
| 2010 | 74° | 53° | 64° | 0.02" | — |
| 2009 | 90° | 62° | 76° | — | — |
| 2008 | 78° | 55° | 67° | — | — |
| 2007 | 71° | 48° | 60° | — | — |
| 2006 | 79° | 55° | 67° | — | — |
| 2005 | 88° | 62° | 75° | — | — |
| 2004 | 86° | 56° | 71° | — | — |
| 2003 | 100° | 68° | 84° | — | — |
| 2002 | 94° | 70° | 82° | — | — |
| 2001 | 90° | 65° | 77° | — | — |
| 2000coldest | 63° | 58° | 60° | — | — |
| 1999 | 88° | 71° | 79° | — | — |
| 1998 | 69° | 56° | 62° | — | — |
| 1997 | 92° | 61° | 76° | — | — |
| 1996 | 84° | 59° | 72° | — | — |
| 1995 | 86° | 65° | 75° | — | — |
| 1994 | 84° | 60° | 72° | — | — |
| 1993 | 76° | 55° | 65° | — | — |
| 1992 | 102° | 50° | 76° | — | — |
| 1991 | 96° | 64° | 80° | — | — |
| 1990 | 78° | 59° | 69° | — | — |
| 1989 | 95° | 52° | 73° | — | — |
| 1988 | 78° | 54° | 66° | — | — |
| 1987 | 95° | 53° | 74° | — | — |
| 1986 | 78° | 45° | 61° | — | — |
| 1985 | 92° | 52° | 72° | — | — |
| 1984 | 83° | 64° | 73° | — | — |
| 1983 | 96° | 67° | 81° | — | — |
| 1982 | 99° | 50° | 74° | — | — |
| 1981 | 94° | 55° | 74° | — | — |
| 1980 | 82° | 58° | 70° | — | — |
| 1979 | 100° | 57° | 79° | — | — |
| 1978 | 90° | 42° | 66° | — | — |
| 1977 | 88° | 47° | 67° | — | — |
| 1976 | 80° | 61° | 70° | — | — |
| 1975 | 104° | 52° | 78° | — | — |
| 1974 | 100° | 58° | 79° | — | — |
| 1973 | 86° | 49° | 67° | — | — |
53 years of data from FALLBROOK 5 NE