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Costa Mesa, CA Weather on August 26
August 26th in Costa Mesa, CA typically brings warm summer weather, with average highs around 84°F and lows near 65°F. Over 55 years of records, the warmest August 26th was in 1981 (84°F average), while the coldest was 1987 (68°F) — a 16°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 2.2°F warmer on this date compared to 20-30 years ago.
What to Expect on August 26
Planning for August 26th in Costa Mesa, CA? Stay hydrated and seek shade during peak afternoon hours.
August 26 Weather Records for Costa Mesa
- •The all-time record high for August 26th in Costa Mesa, CA is 99°F, set in 1981.
- •The coldest August 26th on record dropped to 58°F in 1987.
- •Temperatures have reached 90°F or higher on August 26th in 7 of the last 55 years.
- •Last year (1971), August 26th was 7°F warmer than the long-term average.
Frequently Asked Questions
What was the warmest August 26 ever in Costa Mesa?
The warmest August 26 in Costa Mesa, CA reached 99°F in 1981. That is 15°F above the long-term average high of 84°F.
What was the coldest August 26 ever in Costa Mesa?
The coldest August 26 in Costa Mesa, CA dropped to 58°F in 1987. That is 7°F below the long-term average low of 65°F.
What is the average temperature on August 26 in Costa Mesa?
On August 26, Costa Mesa averages a high of 84°F and a low of 65°F based on 55 years of NOAA weather observations from SANTA ANA JOHN WAYNE AP.
How many years of weather data are available for August 26 in Costa Mesa?
We have 55 years of weather records for August 26 in Costa Mesa, CA, sourced from NOAA's Global Historical Climatology Network. Records include daily high and low temperatures, precipitation, and snowfall data going back to 2025.
August 26 Weather History in Costa Mesa
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 77°F | 68°F | 0" | -- |
| 2024 | 85°F | 66°F | 0" | -- |
| 2023 | 86°F | 64°F | 0" | -- |
| 2022 | 83°F | 71°F | 0" | -- |
| 2021 | 91°F | 69°F | 0" | -- |
| 2020 | 86°F | 68°F | 0" | -- |
| 2019 | 86°F | 71°F | 0" | -- |
| 2018 | 80°F | 69°F | 0" | -- |
| 2017 | 81°F | 65°F | 0" | -- |
| 2016 | 76°F | 65°F | 0" | -- |
| 2015 | 87°F | 70°F | 0" | -- |
| 2014 | 84°F | 69°F | 0" | -- |
| 2013 | 91°F | 67°F | 0" | -- |
| 2012 | 80°F | 68°F | 0" | -- |
| 2011 | 90°F | 67°F | 0" | -- |
| 2010 | 87°F | 66°F | 0" | -- |
| 2009 | 93°F | 64°F | 0" | -- |
| 2008 | 80°F | 67°F | 0" | -- |
| 2007 | 83°F | 67°F | 0" | -- |
| 2006 | 80°F | 65°F | 0" | -- |
| 2005 | 88°F | 69°F | 0" | -- |
| 2004 | 75°F | 66°F | 0" | -- |
| 2003 | 80°F | 60°F | 0" | -- |
| 2002 | 77°F | 61°F | 0" | -- |
| 2001 | 80°F | 64°F | 0" | -- |
| 2000 | 79°F | 65°F | 0" | -- |
| 1999 | 83°F | 64°F | 0" | -- |
| 1998 | 85°F | 67°F | 0" | -- |
| 1997 | 85°F | 65°F | 0" | -- |
| 1996 | 89°F | 63°F | 0" | -- |
| 1995 | 89°F | 59°F | 0" | -- |
| 1994 | 83°F | 66°F | 0" | -- |
| 1993 | 89°F | 67°F | 0" | -- |
| 1992 | 86°F | 64°F | 0" | -- |
| 1991 | 80°F | 64°F | 0" | -- |
| 1990 | 79°F | 61°F | 0" | -- |
| 1989 | 77°F | 65°F | 0" | -- |
| 1988 | 88°F | 68°F | 0" | -- |
| 1987 | 79°F | 58°F | 0" | -- |
| 1986 | 89°F | 64°F | 0" | -- |
| 1985 | 95°F | 68°F | 0" | -- |
| 1984 | 85°F | 68°F | 0" | -- |
| 1983 | 87°F | 61°F | 0" | -- |
| 1982 | 86°F | 66°F | 0" | -- |
| 1981 | 99°F | 70°F | 0" | -- |
| 1980 | 83°F | 62°F | 0" | -- |
| 1979 | 84°F | 64°F | 0" | -- |
| 1978 | 81°F | 61°F | 0" | -- |
| 1977 | 81°F | 66°F | 0" | -- |
| 1976 | 83°F | 62°F | 0" | -- |
| 1975 | 78°F | 61°F | 0" | -- |
| 1974 | 84°F | 62°F | 0" | -- |
| 1973 | 76°F | 63°F | 0" | -- |
| 1972 | 79°F | 61°F | 0" | -- |
| 1971 | 91°F | 62°F | 0" | -- |
Based on 55 years of data from NOAA station: SANTA ANA JOHN WAYNE AP
Monthly Climate Averages
Historical temperature and precipitation averages for Costa Mesa, CA, based on 55+ years of weather data.
Temperatures in Fahrenheit. Precipitation and snowfall in inches.