Dietmar Rabich / CC BY-SA 4.0
Costa Mesa, CA Weather on September 10
September 10th in Costa Mesa, CA typically brings warm fall weather, with average highs around 82°F and lows near 65°F. Over 55 years of records, the warmest September 10th was in 1983 (84°F average), while the coldest was 1973 (66°F) — a 18°F range across recorded history. Rain or other precipitation has occurred on about 4% of September 10th dates historically, with the wettest September 10th recording 1.41" of rain. The last decade has been 1.7°F warmer on this date compared to 20-30 years ago.
What to Expect on September 10
Planning for September 10th in Costa Mesa, CA? Stay hydrated and seek shade during peak afternoon hours.
September 10 Weather Records for Costa Mesa
- •The all-time record high for September 10th in Costa Mesa, CA is 97°F, set in 1983.
- •The coldest September 10th on record dropped to 59°F in 1986.
- •Temperatures have reached 90°F or higher on September 10th in 8 of the last 55 years.
- •Last year (1971), September 10th was 8°F warmer than the long-term average.
Frequently Asked Questions
What was the warmest September 10 ever in Costa Mesa?
The warmest September 10 in Costa Mesa, CA reached 97°F in 1983. That is 15°F above the long-term average high of 82°F.
What was the coldest September 10 ever in Costa Mesa?
The coldest September 10 in Costa Mesa, CA dropped to 59°F in 1986. That is 6°F below the long-term average low of 65°F.
What is the average temperature on September 10 in Costa Mesa?
On September 10, Costa Mesa averages a high of 82°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 September 10 in Costa Mesa?
We have 55 years of weather records for September 10 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.
September 10 Weather History in Costa Mesa
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 77°F | 67°F | 0" | -- |
| 2024 | 84°F | 66°F | 0" | -- |
| 2023 | 86°F | 71°F | 0" | -- |
| 2022 | 84°F | 73°F | 0" | -- |
| 2021 | 87°F | 70°F | 0" | -- |
| 2020 | 85°F | 64°F | 0" | -- |
| 2019 | 78°F | 68°F | 0" | -- |
| 2018 | 79°F | 66°F | 0" | -- |
| 2017 | 85°F | 66°F | 0" | -- |
| 2016 | 80°F | 64°F | 0" | -- |
| 2015 | 93°F | 76°F | 0" | -- |
| 2014 | 89°F | 68°F | 0" | -- |
| 2013 | 80°F | 66°F | 0" | -- |
| 2012 | 86°F | 74°F | 0" | -- |
| 2011 | 72°F | 63°F | 0.07" | -- |
| 2010 | 77°F | 61°F | 0" | -- |
| 2009 | 87°F | 66°F | 0" | -- |
| 2008 | 77°F | 66°F | 0" | -- |
| 2007 | 81°F | 61°F | 0" | -- |
| 2006 | 77°F | 62°F | 0" | -- |
| 2005 | 77°F | 63°F | 0" | -- |
| 2004 | 89°F | 72°F | 0" | -- |
| 2003 | 76°F | 63°F | 0" | -- |
| 2002 | 85°F | 64°F | 0" | -- |
| 2001 | 73°F | 64°F | 0" | -- |
| 2000 | 79°F | 61°F | 0" | -- |
| 1999 | 76°F | 60°F | 0" | -- |
| 1998 | 82°F | 68°F | 0" | -- |
| 1997 | 93°F | 69°F | 0" | -- |
| 1996 | 90°F | 63°F | 0" | -- |
| 1995 | 80°F | 60°F | 0" | -- |
| 1994 | 85°F | 64°F | 0" | -- |
| 1993 | 85°F | 66°F | 0" | -- |
| 1992 | 80°F | 63°F | 0" | -- |
| 1991 | 73°F | 62°F | 0" | -- |
| 1990 | 95°F | 65°F | 0" | -- |
| 1989 | 77°F | 60°F | 0" | -- |
| 1988 | 75°F | 61°F | 0" | -- |
| 1987 | 83°F | 61°F | 0" | -- |
| 1986 | 79°F | 59°F | 0" | -- |
| 1985 | 74°F | 61°F | 0" | -- |
| 1984 | 89°F | 76°F | 0" | -- |
| 1983 | 97°F | 71°F | 0" | -- |
| 1982 | 75°F | 66°F | 0" | -- |
| 1981 | 78°F | 63°F | 0" | -- |
| 1980 | 76°F | 63°F | 0" | -- |
| 1979 | 94°F | 65°F | 0" | -- |
| 1978 | 78°F | 60°F | 0" | -- |
| 1977 | 82°F | 62°F | 0" | -- |
| 1976 | 90°F | 70°F | 1.41" | -- |
| 1975 | 72°F | 64°F | 0" | -- |
| 1974 | 81°F | 65°F | 0" | -- |
| 1973 | 69°F | 63°F | 0" | -- |
| 1972 | 75°F | 66°F | 0" | -- |
| 1971 | 90°F | 65°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.