Weather on August 15
Costa Mesa, CA
55 Years of Data
About This Date
August 15th in Costa Mesa, CA typically brings warm summer weather, with average highs around 81°F and lows near 66°F. Over 56 years of records, the warmest August 15th was in 1992 (82°F average), while the coldest was 1975 (68°F) — a 14°F range across recorded history. Rain or other precipitation has occurred on about 4% of August 15th dates historically. The last decade has been 1.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.5°F warmer on this date compared to 20-30 years ago.
Planning for August 15th in Costa Mesa, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 79° | 70° | 74° | — | — |
| 2025 | 73° | 66° | 70° | — | — |
| 2024 | 83° | 67° | 75° | — | — |
| 2023 | 83° | 69° | 76° | — | — |
| 2022 | 84° | 69° | 77° | — | — |
| 2021 | 86° | 69° | 78° | — | — |
| 2020 | 87° | 71° | 79° | — | — |
| 2019 | 81° | 65° | 73° | — | — |
| 2018 | 81° | 71° | 76° | — | — |
| 2017 | 72° | 66° | 69° | — | — |
| 2016 | 90° | 65° | 77° | — | — |
| 2015 | 89° | 70° | 79° | — | — |
| 2014 | 89° | 68° | 79° | — | — |
| 2013 | 80° | 64° | 72° | — | — |
| 2012 | 81° | 68° | 74° | — | — |
| 2011 | 76° | 65° | 70° | — | — |
| 2010 | 78° | 62° | 70° | — | — |
| 2009 | 76° | 65° | 70° | — | — |
| 2008 | 79° | 68° | 73° | — | — |
| 2007 | 86° | 69° | 78° | — | — |
| 2006 | 77° | 66° | 72° | — | — |
| 2005 | 73° | 65° | 69° | — | — |
| 2004 | 74° | 65° | 69° | — | — |
| 2003 | 89° | 70° | 79° | — | — |
| 2002 | 74° | 64° | 69° | — | — |
| 2001 | 84° | 66° | 75° | — | — |
| 2000 | 82° | 68° | 75° | — | — |
| 1999 | 76° | 62° | 69° | — | — |
| 1998 | 83° | 68° | 75° | — | — |
| 1997 | 79° | 67° | 73° | — | — |
| 1996 | 93° | 68° | 81° | — | — |
| 1995 | 79° | 59° | 69° | — | — |
| 1994 | 91° | 69° | 80° | — | — |
| 1993 | 78° | 64° | 71° | — | — |
| 1992warmest | 94° | 71° | 82° | — | — |
| 1991 | 81° | 65° | 73° | — | — |
| 1990 | 77° | 69° | 73° | — | — |
| 1989 | 81° | 63° | 72° | — | — |
| 1988 | 81° | 58° | 69° | — | — |
| 1987 | 77° | 63° | 70° | — | — |
| 1986 | 79° | 61° | 70° | — | — |
| 1985 | 80° | 59° | 70° | — | — |
| 1984 | 87° | 68° | 78° | 0.22" | — |
| 1983 | 90° | 72° | 81° | 0.09" | — |
| 1982 | 79° | 59° | 69° | — | — |
| 1981 | 87° | 65° | 76° | — | — |
| 1980 | 78° | 65° | 71° | — | — |
| 1979 | 78° | 61° | 69° | — | — |
| 1978 | 83° | 62° | 72° | — | — |
| 1977 | 86° | 62° | 74° | — | — |
| 1976 | 76° | 62° | 69° | — | — |
| 1975coldest | 78° | 58° | 68° | — | — |
| 1974 | 79° | 64° | 71° | — | — |
| 1973 | 83° | 65° | 74° | — | — |
| 1972 | 80° | 61° | 70° | — | — |
| 1971 | 83° | 67° | 75° | — | — |
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 August 15th
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.
August 15th outlook →