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Costa Mesa, CA Weather on July 11
July 11th in Costa Mesa, CA typically brings warm summer weather, with average highs around 81°F and lows near 64°F. Over 55 years of records, the warmest July 11th was in 1990 (83°F average), while the coldest was 1977 (67°F) — a 16°F range across recorded history. Rain or other precipitation has occurred on about 4% of July 11th dates historically. The last decade has been 2.6°F warmer on this date compared to 20-30 years ago.
What to Expect on July 11
Planning for July 11th in Costa Mesa, CA? Stay hydrated and seek shade during peak afternoon hours.
July 11 Weather Records for Costa Mesa
- •The all-time record high for July 11th in Costa Mesa, CA is 96°F, set in 1990.
- •The coldest July 11th on record dropped to 59°F in 1977.
- •Temperatures have reached 90°F or higher on July 11th in 8 of the last 55 years.
- •Last year (1971), July 11th was 12°F warmer than the long-term average.
Frequently Asked Questions
What was the warmest July 11 ever in Costa Mesa?
The warmest July 11 in Costa Mesa, CA reached 96°F in 1990. That is 15°F above the long-term average high of 81°F.
What was the coldest July 11 ever in Costa Mesa?
The coldest July 11 in Costa Mesa, CA dropped to 59°F in 1977. That is 5°F below the long-term average low of 64°F.
What is the average temperature on July 11 in Costa Mesa?
On July 11, Costa Mesa averages a high of 81°F and a low of 64°F based on 55 years of NOAA weather observations from SANTA ANA JOHN WAYNE AP.
How many years of weather data are available for July 11 in Costa Mesa?
We have 55 years of weather records for July 11 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.
July 11 Weather History in Costa Mesa
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 77°F | 65°F | 0" | -- |
| 2024 | 82°F | 66°F | 0" | -- |
| 2023 | 82°F | 65°F | 0" | -- |
| 2022 | 76°F | 65°F | 0" | -- |
| 2021 | 80°F | 69°F | 0" | -- |
| 2020 | 91°F | 68°F | 0" | -- |
| 2019 | 78°F | 66°F | 0" | -- |
| 2018 | 84°F | 69°F | 0" | -- |
| 2017 | 82°F | 68°F | 0" | -- |
| 2016 | 76°F | 66°F | 0" | -- |
| 2015 | 76°F | 63°F | 0" | -- |
| 2014 | 81°F | 69°F | 0" | -- |
| 2013 | 75°F | 69°F | 0" | -- |
| 2012 | 84°F | 64°F | 0" | -- |
| 2011 | 75°F | 66°F | 0" | -- |
| 2010 | 75°F | 64°F | 0" | -- |
| 2009 | 86°F | 64°F | 0" | -- |
| 2008 | 78°F | 67°F | 0" | -- |
| 2007 | 76°F | 65°F | 0" | -- |
| 2006 | 82°F | 65°F | 0" | -- |
| 2005 | 75°F | 63°F | 0" | -- |
| 2004 | 79°F | 63°F | 0" | -- |
| 2003 | 79°F | 66°F | 0" | -- |
| 2002 | 77°F | 65°F | 0" | -- |
| 2001 | 74°F | 62°F | 0" | -- |
| 2000 | 75°F | 63°F | 0" | -- |
| 1999 | 83°F | 65°F | 0.03" | -- |
| 1998 | 83°F | 63°F | 0" | -- |
| 1997 | 77°F | 66°F | 0" | -- |
| 1996 | 85°F | 62°F | 0" | -- |
| 1995 | 90°F | 61°F | 0" | -- |
| 1994 | 80°F | 63°F | 0" | -- |
| 1993 | 82°F | 64°F | 0" | -- |
| 1992 | 91°F | 68°F | 0.15" | -- |
| 1991 | 77°F | 62°F | 0" | -- |
| 1990 | 96°F | 69°F | 0" | -- |
| 1989 | 78°F | 66°F | 0" | -- |
| 1988 | 77°F | 62°F | 0" | -- |
| 1987 | 77°F | 61°F | 0" | -- |
| 1986 | 78°F | 63°F | 0" | -- |
| 1985 | 90°F | 66°F | 0" | -- |
| 1984 | 89°F | 64°F | 0" | -- |
| 1983 | 91°F | 64°F | 0" | -- |
| 1982 | 81°F | 61°F | 0" | -- |
| 1981 | 82°F | 67°F | 0" | -- |
| 1980 | 88°F | 62°F | 0" | -- |
| 1979 | 81°F | 62°F | 0" | -- |
| 1978 | 80°F | 61°F | 0" | -- |
| 1977 | 76°F | 59°F | 0" | -- |
| 1976 | 80°F | 65°F | 0" | -- |
| 1975 | 91°F | 66°F | 0" | -- |
| 1974 | 78°F | 61°F | 0" | -- |
| 1973 | 78°F | 62°F | 0" | -- |
| 1972 | 88°F | 62°F | 0" | -- |
| 1971 | 93°F | 60°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.