Weather on September 1
Costa Mesa, CA
55 Years of Data
About This Date
September 1st in Costa Mesa, CA typically brings warm fall weather, with average highs around 83°F and lows near 66°F. Over 55 years of records, the warmest September 1st was in 1998 (86°F average), while the coldest was 1973 (69°F) — a 17°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 1.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.0°F warmer on this date compared to 20-30 years ago.
Planning for September 1st in Costa Mesa, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 85° | 68° | 76° | — | — |
| 2024 | 79° | 68° | 73° | — | — |
| 2023 | 81° | 69° | 75° | — | — |
| 2022 | 88° | 72° | 80° | — | — |
| 2021 | 76° | 69° | 72° | — | — |
| 2020 | 78° | 67° | 72° | — | — |
| 2019 | 80° | 71° | 76° | — | — |
| 2018 | 77° | 68° | 73° | — | — |
| 2017 | 96° | 72° | 84° | — | — |
| 2016 | 77° | 66° | 72° | — | — |
| 2015 | 78° | 69° | 74° | — | — |
| 2014 | 82° | 71° | 77° | — | — |
| 2013 | 90° | 74° | 82° | — | — |
| 2012 | 87° | 66° | 77° | — | — |
| 2011 | 76° | 63° | 69° | — | — |
| 2010 | 80° | 62° | 71° | — | — |
| 2009 | 86° | 71° | 79° | — | — |
| 2008 | 78° | 67° | 72° | — | — |
| 2007 | 88° | 72° | 80° | — | — |
| 2006 | 88° | 65° | 76° | — | — |
| 2005 | 78° | 63° | 70° | — | — |
| 2004 | 83° | 62° | 72° | — | — |
| 2003 | 76° | 65° | 70° | — | — |
| 2002 | 95° | 66° | 81° | — | — |
| 2001 | 80° | 65° | 72° | — | — |
| 2000 | 76° | 64° | 70° | — | — |
| 1999 | 75° | 62° | 69° | — | — |
| 1998warmest | 97° | 75° | 86° | — | — |
| 1997 | 89° | 63° | 76° | — | — |
| 1996 | 87° | 67° | 77° | — | — |
| 1995 | 91° | 65° | 78° | — | — |
| 1994 | 80° | 65° | 72° | — | — |
| 1993 | 84° | 66° | 75° | — | — |
| 1992 | 79° | 64° | 71° | — | — |
| 1991 | 85° | 62° | 73° | — | — |
| 1990 | 81° | 62° | 71° | — | — |
| 1989 | 83° | 61° | 72° | — | — |
| 1988 | 80° | 62° | 71° | — | — |
| 1987 | 98° | 65° | 81° | — | — |
| 1986 | 81° | 64° | 72° | — | — |
| 1985 | 87° | 69° | 78° | — | — |
| 1984 | 85° | 67° | 76° | — | — |
| 1983 | 87° | 66° | 77° | — | — |
| 1982 | 97° | 64° | 80° | — | — |
| 1981 | 82° | 64° | 73° | — | — |
| 1980 | 79° | 63° | 71° | — | — |
| 1979 | 81° | 66° | 73° | — | — |
| 1978 | 83° | 66° | 74° | — | — |
| 1977 | 80° | 64° | 72° | — | — |
| 1976 | 89° | 67° | 78° | — | — |
| 1975 | 79° | 60° | 69° | — | — |
| 1974 | 88° | 60° | 74° | — | — |
| 1973coldest | 78° | 60° | 69° | — | — |
| 1972 | 85° | 67° | 76° | — | — |
| 1971 | 82° | 62° | 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: June, July.