Wing-Chi Poon / CC BY-SA 2.5
San Marcos, CA Weather on August 27
August 27th in San Marcos, CA typically brings warm summer weather, with average highs around 89°F and lows near 63°F — a 26°F daily swing. Over 55 years of records, the warmest August 27th was in 1981 (86°F average), while the coldest was 1973 (65°F) — a 21°F range across recorded history. Rain or other precipitation has occurred on about 2% of August 27th dates historically. The last decade has been 2.5°F warmer on this date compared to 20-30 years ago.
What to Expect on August 27
Planning for August 27th in San Marcos, CA? Stay hydrated and seek shade during peak afternoon hours.
August 27 Weather Records for San Marcos
- •The all-time record high for August 27th in San Marcos, CA is 102°F, set in 1981.
- •The coldest August 27th on record dropped to 33°F in 2003.
- •Temperatures have reached 90°F or higher on August 27th in 30 of the last 55 years.
- •Last year (1971), August 27th was 5°F warmer than the long-term average.
Frequently Asked Questions
What was the warmest August 27 ever in San Marcos?
The warmest August 27 in San Marcos, CA reached 102°F in 1981. That is 13°F above the long-term average high of 89°F.
What was the coldest August 27 ever in San Marcos?
The coldest August 27 in San Marcos, CA dropped to 33°F in 2003. That is 30°F below the long-term average low of 63°F.
What is the average temperature on August 27 in San Marcos?
On August 27, San Marcos averages a high of 89°F and a low of 63°F based on 55 years of NOAA weather observations from ESCONDIDO #2.
How many years of weather data are available for August 27 in San Marcos?
We have 55 years of weather records for August 27 in San Marcos, 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 27 Weather History in San Marcos
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 97°F | 67°F | 0" | -- |
| 2024 | 90°F | 62°F | 0" | -- |
| 2023 | 97°F | 65°F | 0" | -- |
| 2022 | 88°F | 67°F | 0" | -- |
| 2021 | 97°F | 65°F | 0" | -- |
| 2020 | 94°F | 67°F | 0" | -- |
| 2019 | 94°F | 68°F | 0" | -- |
| 2018 | 87°F | 67°F | 0" | -- |
| 2017 | 91°F | 65°F | 0" | -- |
| 2016 | 79°F | 64°F | 0" | -- |
| 2015 | 97°F | 71°F | 0" | -- |
| 2014 | 96°F | 66°F | 0" | -- |
| 2013 | 91°F | 70°F | 0" | -- |
| 2012 | 90°F | 61°F | 0" | -- |
| 2011 | 97°F | 72°F | 0" | -- |
| 2010 | 74°F | 64°F | 0" | -- |
| 2009 | 93°F | 66°F | 0" | -- |
| 2008 | 75°F | 68°F | 0" | -- |
| 2007 | 77°F | 67°F | 0" | -- |
| 2006 | 77°F | 61°F | 0.01" | -- |
| 2005 | 84°F | 67°F | 0" | -- |
| 2004 | 86°F | 62°F | 0" | -- |
| 2003 | -- | 33°F | 0" | -- |
| 2002 | 87°F | 60°F | 0" | -- |
| 2001 | 96°F | 59°F | 0" | -- |
| 2000 | 85°F | 65°F | 0" | -- |
| 1999 | 90°F | 63°F | 0" | -- |
| 1998 | 91°F | 63°F | 0" | -- |
| 1997 | 92°F | 62°F | 0" | -- |
| 1996 | 93°F | 61°F | 0" | -- |
| 1995 | 95°F | 62°F | 0" | -- |
| 1994 | 95°F | 67°F | 0" | -- |
| 1993 | 87°F | 69°F | 0" | -- |
| 1992 | 94°F | 62°F | 0" | -- |
| 1991 | 82°F | 63°F | 0" | -- |
| 1990 | 84°F | 55°F | 0" | -- |
| 1989 | 80°F | 60°F | 0" | -- |
| 1988 | 92°F | 67°F | 0" | -- |
| 1987 | 83°F | 55°F | 0" | -- |
| 1986 | 94°F | 66°F | 0" | -- |
| 1985 | 94°F | 63°F | 0" | -- |
| 1984 | 91°F | 65°F | 0" | -- |
| 1983 | 96°F | 63°F | 0" | -- |
| 1982 | 90°F | 68°F | 0" | -- |
| 1981 | 102°F | 69°F | 0" | -- |
| 1980 | -- | 60°F | 0" | -- |
| 1979 | 87°F | 59°F | 0" | -- |
| 1978 | 85°F | 54°F | 0" | -- |
| 1977 | 82°F | 64°F | 0" | -- |
| 1976 | 89°F | 65°F | 0" | -- |
| 1975 | 88°F | 51°F | 0" | -- |
| 1974 | 90°F | 54°F | 0" | -- |
| 1973 | 79°F | 52°F | 0" | -- |
| 1972 | 84°F | 63°F | 0" | -- |
| 1971 | 94°F | 59°F | 0" | -- |
Based on 55 years of data from NOAA station: ESCONDIDO #2
Monthly Climate Averages
Historical temperature and precipitation averages for San Marcos, CA, based on 55+ years of weather data.
Temperatures in Fahrenheit. Precipitation and snowfall in inches.