Weather on September 18
Temecula, CA
55 Years of Data
Avg High
86°F
Avg Low
58°F
Warmest
2020
88°F avg
Coldest
1999
62°F avg
About This Date
September 18th 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 52 years of records, the warmest September 18th was in 2020 (88°F average), while the coldest was 1999 (62°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 4% of September 18th dates historically, with the wettest September 18th recording 0.78" of rain. The last decade has been 3.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.7°F warmer on this date compared to 20-30 years ago.
Planning for September 18th in Temecula, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 87° | 66° | 77° | 0.78" | — |
| 2024 | 79° | 54° | 67° | — | — |
| 2023 | 78° | 60° | 69° | — | — |
| 2022 | 81° | 59° | 70° | — | — |
| 2021 | 82° | 56° | 69° | — | — |
| 2020warmest | 103° | 72° | 88° | — | — |
| 2019 | 84° | 58° | 71° | — | — |
| 2018 | 89° | 59° | 74° | — | — |
| 2017 | 81° | 59° | 70° | — | — |
| 2016 | 101° | 68° | 84° | — | — |
| 2015 | 90° | 62° | 76° | — | — |
| 2014 | 84° | 65° | 74° | — | — |
| 2013 | 79° | 60° | 69° | — | — |
| 2012 | 88° | 57° | 72° | — | — |
| 2011 | 86° | 54° | 70° | — | — |
| 2010 | 86° | 48° | 67° | — | — |
| 2009 | 97° | 59° | 78° | — | — |
| 2008 | 91° | 61° | 76° | — | — |
| 2007 | 75° | 53° | 64° | — | — |
| 2006 | 93° | 63° | 78° | — | — |
| 2005 | 80° | 55° | 68° | — | — |
| 2004 | 81° | 58° | 69° | — | — |
| 2003 | 87° | 60° | 74° | — | — |
| 2002 | 78° | 54° | 66° | — | — |
| 2001 | 76° | 58° | 67° | — | — |
| 2000 | 92° | 68° | 80° | — | — |
| 1999coldest | 71° | 54° | 62° | — | — |
| 1998 | 82° | 62° | 72° | — | — |
| 1997 | 88° | 63° | 75° | — | — |
| 1996 | 79° | 60° | 69° | — | — |
| 1995 | 83° | 61° | 72° | — | — |
| 1994 | 87° | 59° | 73° | — | — |
| 1993 | 75° | 51° | 63° | — | — |
| 1992 | 96° | 62° | 79° | — | — |
| 1991 | 96° | 57° | 77° | — | — |
| 1990 | 88° | 59° | 73° | — | — |
| 1989 | 72° | 54° | 63° | — | — |
| 1988 | 81° | 55° | 68° | — | — |
| 1987 | 88° | 52° | 70° | — | — |
| 1986 | 88° | 57° | 72° | — | — |
| 1985 | 73° | 55° | 64° | — | — |
| 1984 | 107° | 67° | 87° | — | — |
| 1982 | 78° | 53° | 66° | 0.23" | — |
| 1981 | 99° | 62° | 80° | — | — |
| 1980 | 101° | 50° | 75° | — | — |
| 1979 | 103° | 59° | 81° | — | — |
| 1978 | 77° | 55° | 66° | — | — |
| 1977 | 86° | 50° | 68° | — | — |
| 1976 | 80° | 52° | 66° | — | — |
| 1975 | 94° | 60° | 77° | — | — |
| 1974 | 96° | 52° | 74° | — | — |
| 1973 | 88° | 44° | 66° | — | — |
52 years of data from FALLBROOK 5 NE