Weather on September 4
Costa Mesa, CA
55 Years of Data
Avg High
85°F
Avg Low
66°F
Warmest
2022
92°F avg
Coldest
1985
66°F avg
About This Date
September 4th in Costa Mesa, CA typically brings warm fall weather, with average highs around 85°F and lows near 66°F. Over 55 years of records, the warmest September 4th was in 2022 (92°F average), while the coldest was 1985 (66°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 2% of September 4th dates historically, with the wettest September 4th recording 0.66" of rain. The last decade has been 3.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.3°F warmer on this date compared to 20-30 years ago.
Planning for September 4th in Costa Mesa, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 84° | 68° | 76° | — | — |
| 2024 | 90° | 69° | 79° | — | — |
| 2023 | 78° | 66° | 72° | — | — |
| 2022warmest | 106° | 79° | 92° | — | — |
| 2021 | 90° | 65° | 77° | — | — |
| 2020 | 86° | 67° | 76° | — | — |
| 2019 | 94° | 73° | 83° | — | — |
| 2018 | 76° | 69° | 72° | — | — |
| 2017 | 76° | 70° | 73° | — | — |
| 2016 | 76° | 65° | 70° | — | — |
| 2015 | 77° | 66° | 72° | — | — |
| 2014 | 82° | 71° | 77° | — | — |
| 2013 | 95° | 76° | 85° | — | — |
| 2012 | 93° | 69° | 81° | — | — |
| 2011 | 77° | 62° | 70° | — | — |
| 2010 | 86° | 60° | 73° | — | — |
| 2009 | 91° | 71° | 81° | — | — |
| 2008 | 85° | 67° | 76° | — | — |
| 2007 | 85° | 70° | 77° | — | — |
| 2006 | 87° | 67° | 77° | — | — |
| 2005 | 79° | 61° | 70° | — | — |
| 2004 | 89° | 61° | 75° | — | — |
| 2003 | 86° | 65° | 75° | — | — |
| 2002 | 81° | 66° | 73° | — | — |
| 2001 | 79° | 67° | 73° | — | — |
| 2000 | 79° | 61° | 70° | — | — |
| 1999 | 74° | 63° | 68° | — | — |
| 1998 | 81° | 72° | 76° | — | — |
| 1997 | 96° | 72° | 84° | — | — |
| 1996 | 80° | 67° | 73° | — | — |
| 1995 | 90° | 66° | 78° | — | — |
| 1994 | 84° | 63° | 73° | — | — |
| 1993 | 88° | 66° | 77° | — | — |
| 1992 | 79° | 61° | 70° | — | — |
| 1991 | 80° | 64° | 72° | — | — |
| 1990 | 89° | 62° | 76° | — | — |
| 1989 | 85° | 58° | 71° | — | — |
| 1988 | 108° | 74° | 91° | — | — |
| 1987 | 83° | 65° | 74° | — | — |
| 1986 | 82° | 62° | 72° | — | — |
| 1985coldest | 72° | 60° | 66° | 0.66" | — |
| 1984 | 100° | 68° | 84° | — | — |
| 1983 | 82° | 63° | 72° | — | — |
| 1982 | 94° | 68° | 81° | — | — |
| 1981 | 79° | 64° | 71° | — | — |
| 1980 | 80° | 60° | 70° | — | — |
| 1979 | 85° | 60° | 72° | — | — |
| 1978 | 89° | 69° | 79° | — | — |
| 1977 | 87° | 60° | 74° | — | — |
| 1976 | 89° | 69° | 79° | — | — |
| 1975 | 86° | 61° | 73° | — | — |
| 1974 | 87° | 66° | 77° | — | — |
| 1973 | 74° | 62° | 68° | — | — |
| 1972 | 92° | 68° | 80° | — | — |
| 1971 | 83° | 61° | 72° | — | — |
55 years of data from SANTA ANA JOHN WAYNE AP