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Garden Grove, CA Weather on August 18
August 18th in Garden Grove, CA typically brings warm summer weather, with average highs around 84°F and lows near 65°F. Over 54 years of records, the warmest August 18th was in 2020 (88°F average), while the coldest was 1975 (67°F) — a 21°F range across recorded history. Rain or other precipitation has occurred on about 2% of August 18th dates historically. The last decade has been 3.3°F warmer on this date compared to 20-30 years ago.
What to Expect on August 18
Planning for August 18th in Garden Grove, CA? Stay hydrated and seek shade during peak afternoon hours.
August 18 Weather Records for Garden Grove
- •The all-time record high for August 18th in Garden Grove, CA is 106°F, set in 2020.
- •The coldest August 18th on record dropped to 53°F in 2005.
- •Temperatures have reached 90°F or higher on August 18th in 6 of the last 54 years.
Frequently Asked Questions
What was the warmest August 18 ever in Garden Grove?
The warmest August 18 in Garden Grove, CA reached 106°F in 2020. That is 22°F above the long-term average high of 84°F.
What was the coldest August 18 ever in Garden Grove?
The coldest August 18 in Garden Grove, CA dropped to 53°F in 2005. That is 12°F below the long-term average low of 65°F.
What is the average temperature on August 18 in Garden Grove?
On August 18, Garden Grove averages a high of 84°F and a low of 65°F based on 54 years of NOAA weather observations from SANTA ANA FIRE STN.
How many years of weather data are available for August 18 in Garden Grove?
We have 54 years of weather records for August 18 in Garden Grove, 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 18 Weather History in Garden Grove
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 85°F | 67°F | 0" | -- |
| 2024 | 85°F | 69°F | 0" | -- |
| 2023 | 86°F | 64°F | 0" | -- |
| 2022 | 87°F | 67°F | 0" | -- |
| 2021 | 79°F | 69°F | 0" | -- |
| 2020 | 106°F | 71°F | 0" | -- |
| 2019 | 83°F | 66°F | 0" | -- |
| 2018 | 87°F | 72°F | 0" | -- |
| 2017 | 82°F | 66°F | 0" | -- |
| 2016 | 85°F | 64°F | 0" | -- |
| 2015 | 84°F | 70°F | 0" | -- |
| 2014 | 86°F | 66°F | 0" | -- |
| 2013 | 82°F | 64°F | 0" | -- |
| 2012 | 92°F | 70°F | 0" | -- |
| 2011 | 84°F | 63°F | 0" | -- |
| 2010 | 95°F | 69°F | 0" | -- |
| 2009 | 81°F | 63°F | 0" | -- |
| 2008 | 86°F | 64°F | 0" | -- |
| 2007 | 92°F | 68°F | 0" | -- |
| 2006 | 85°F | 62°F | 0" | -- |
| 2005 | 82°F | 53°F | 0" | -- |
| 2004 | 82°F | 62°F | 0" | -- |
| 2003 | 88°F | 64°F | 0" | -- |
| 2002 | 75°F | 64°F | 0" | -- |
| 2001 | 87°F | 63°F | 0" | -- |
| 2000 | 89°F | 66°F | 0" | -- |
| 1999 | 86°F | 59°F | 0" | -- |
| 1998 | 84°F | 66°F | 0" | -- |
| 1997 | 86°F | 63°F | 0" | -- |
| 1996 | 82°F | 66°F | 0" | -- |
| 1995 | 83°F | 62°F | 0" | -- |
| 1994 | 86°F | 67°F | 0" | -- |
| 1993 | 79°F | 65°F | 0" | -- |
| 1992 | 92°F | 68°F | 0" | -- |
| 1991 | 79°F | 65°F | 0" | -- |
| 1990 | 80°F | 67°F | 0" | -- |
| 1989 | 79°F | 63°F | 0" | -- |
| 1988 | 78°F | 63°F | 0" | -- |
| 1987 | 72°F | 62°F | 0" | -- |
| 1986 | 95°F | 68°F | 0" | -- |
| 1985 | 82°F | 64°F | 0" | -- |
| 1984 | 84°F | 79°F | 0" | -- |
| 1983 | 78°F | 69°F | 0" | -- |
| 1982 | 83°F | 63°F | 0" | -- |
| 1981 | 78°F | 68°F | 0" | -- |
| 1980 | 77°F | 66°F | 0" | -- |
| 1979 | 77°F | 67°F | 0" | -- |
| 1978 | 80°F | 58°F | 0" | -- |
| 1977 | 78°F | 67°F | 0.26" | -- |
| 1975 | 76°F | 59°F | 0" | -- |
| 1974 | 81°F | 61°F | 0" | -- |
| 1973 | 86°F | 63°F | 0" | -- |
| 1972 | 79°F | 63°F | 0" | -- |
| 1971 | 83°F | 64°F | 0" | -- |
Based on 54 years of data from NOAA station: SANTA ANA FIRE STN
Monthly Climate Averages
Historical temperature and precipitation averages for Garden Grove, CA, based on 55+ years of weather data.
Temperatures in Fahrenheit. Precipitation and snowfall in inches.