Historical Weather in San Marcos, CA
See 55+ years of weather history for any date in San Marcos going back to 1970.
Part of California weather history
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Today in San Marcos Weather HistorySee records, averages, and 55+ years of data for today's date
→Monthly Climate Averages
Historical temperature and precipitation averages for San Marcos, CA, based on 55+ years of weather data.
Warmest MonthAugustAvg High: 84°F / Low: 64°F
Coldest MonthDecemberAvg High: 67°F / Low: 44°F
Jan
67°/ 45°
💧 10.0"
Feb
68°/ 46°
💧 10.0"
Mar
68°/ 49°
💧 8.1"
Apr
71°/ 51°
💧 5.3"
May
73°/ 56°
💧 3.1"
Jun
78°/ 59°
💧 1.7"
Jul
83°/ 63°
💧 2.9"
Aug
84°/ 64°
💧 5.6"
Sep
82°/ 63°
💧 2.8"
Oct
78°/ 57°
💧 4.8"
Nov
72°/ 49°
💧 6.9"
Dec
67°/ 44°
💧 7.5"
Temperatures in Fahrenheit. Precipitation and snowfall in inches.
San Marcos Temperature Records
- Record High: The hottest temperature ever recorded in San Marcos, CA is 115°F, set on September 6, 2020.
- Record Low: The coldest temperature ever recorded in San Marcos, CA is 23°F, set on December 18, 2007.
- Data Coverage: Based on 47 years of data from NOAA weather station: ESCONDIDO #2.
All-Time Record High
115°F
September 6, 2020
All-Time Record Low
23°F
December 18, 2007
Monthly Temperature Records in San Marcos
| Month | Record High | Record Low |
|---|---|---|
| January | 94°F(2021) | 23°F(2019) |
| February | 94°F(1988) | 24°F(2018) |
| March | 97°F(1988) | 25°F(2007) |
| April | 103°F(1989) | 29°F(2003) |
| May | 104°F(2014) | 32°F(2003) |
| June | 108°F(1985) | 41°F(2003) |
| July | 114°F(2018) | 44°F(2004) |
| August | 110°F(2025) | 41°F(2004) |
| September | 115°F(2020) | 39°F(2007) |
| October | 107°F(2024) | 31°F(2019) |
| November | 99°F(2010) | 29°F(1979) |
| December | 90°F(1979) | 23°F(2007) |
San Marcos Snow RecordsSee the top 10 snowiest days ever recorded
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