Weather on September 23
Costa Mesa, CA
55 Years of Data
About This Date
September 23rd in Costa Mesa, CA typically brings warm fall weather, with average highs around 82°F and lows near 63°F. Over 55 years of records, the warmest September 23rd was in 1992 (84°F average), while the coldest was 1986 (63°F) — a 21°F range across recorded history. Rain or other precipitation has occurred on about 4% of September 23rd dates historically. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for September 23rd in Costa Mesa, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 83° | 67° | 75° | — | — |
| 2024 | 76° | 63° | 69° | — | — |
| 2023 | 75° | 63° | 69° | — | — |
| 2022 | 88° | 65° | 76° | — | — |
| 2021 | 79° | 66° | 72° | — | — |
| 2020 | 85° | 64° | 74° | — | — |
| 2019 | 80° | 68° | 74° | — | — |
| 2018 | 78° | 66° | 72° | — | — |
| 2017 | 73° | 58° | 65° | — | — |
| 2016 | 78° | 60° | 69° | — | — |
| 2015 | 83° | 67° | 75° | — | — |
| 2014 | 85° | 67° | 76° | — | — |
| 2013 | 88° | 60° | 74° | — | — |
| 2012 | 91° | 70° | 80° | — | — |
| 2011 | 76° | 62° | 69° | — | — |
| 2010 | 79° | 60° | 69° | — | — |
| 2009 | 98° | 63° | 80° | — | — |
| 2008 | 78° | 63° | 70° | — | — |
| 2007 | 71° | 59° | 65° | — | — |
| 2006 | 75° | 60° | 68° | — | — |
| 2005 | 73° | 62° | 68° | — | — |
| 2004 | 85° | 62° | 73° | — | — |
| 2003 | 72° | 61° | 66° | — | — |
| 2002 | 85° | 64° | 74° | — | — |
| 2001 | 77° | 61° | 69° | — | — |
| 2000 | 75° | 64° | 70° | — | — |
| 1999 | 73° | 63° | 68° | — | — |
| 1998 | 77° | 62° | 70° | — | — |
| 1997 | 95° | 65° | 80° | — | — |
| 1996 | 80° | 64° | 72° | — | — |
| 1995 | 79° | 61° | 70° | — | — |
| 1994 | 82° | 64° | 73° | — | — |
| 1993 | 78° | 57° | 68° | — | — |
| 1992warmest | 99° | 69° | 84° | — | — |
| 1991 | 89° | 66° | 78° | — | — |
| 1990 | 80° | 61° | 70° | — | — |
| 1989 | 80° | 63° | 71° | — | — |
| 1988 | 78° | 56° | 67° | — | — |
| 1987 | 86° | 67° | 76° | 0.05" | — |
| 1986coldest | 68° | 58° | 63° | — | — |
| 1985 | 87° | 61° | 74° | — | — |
| 1984 | 79° | 65° | 72° | — | — |
| 1983 | 84° | 66° | 75° | 0.01" | — |
| 1982 | 96° | 60° | 78° | — | — |
| 1981 | 78° | 65° | 71° | — | — |
| 1980 | 75° | 59° | 67° | — | — |
| 1979 | 90° | 67° | 78° | — | — |
| 1978 | 104° | 62° | 83° | — | — |
| 1977 | 79° | 58° | 68° | — | — |
| 1976 | 76° | 68° | 72° | — | — |
| 1975 | 102° | 63° | 82° | — | — |
| 1974 | 87° | 62° | 75° | — | — |
| 1973 | 76° | 61° | 68° | — | — |
| 1972 | 88° | 63° | 75° | — | — |
| 1971 | 83° | 61° | 72° | — | — |
Costa Mesa, CA Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Costa Mesa, CA Monthly Precipitation
Average rainfall per month, in inches.
Costa Mesa, CA Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Costa Mesa, CA
Most pleasant months in Costa Mesa, CA: January, February, March, April, May, June, July, October, November, December.
What to expect on September 23rd
This page shows what actually happened each year. For the odds — typical high and low, and how often it stays dry — see the climatological outlook for this date.
September 23rd outlook →