What is the highest temperature ever recorded in San Marcos, CA?

The record high temperature in San Marcos, CA is 115°F, recorded on September 6, 2020.

What is the lowest temperature ever recorded in San Marcos, CA?

The record low temperature in San Marcos, CA is 23°F, recorded on December 18, 2007.

Historical Weather in San Marcos, CA

Name: San Marcos, CA Temperature Records
Creator: NOAA

See 55+ years of weather history for any date in San Marcos going back to 1970.

Part of California weather history · California temperature records

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Today in San Marcos Weather HistorySee records, averages, and 55+ years of data for today's date

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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°

💧 5.2"

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, CA Temperature Range by Month

Average monthly highs and lows. The shaded band shows the typical daily temperature range.

Avg high Avg low

San Marcos, CA Monthly Precipitation

Average rainfall per month, in inches.

Rain (in)

San Marcos, CA Daily Temperature Calendar

Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.

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Best Time to Visit San Marcos, CA

Most pleasant months in San Marcos, CA: June.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Pleasant (65-82°F, ≤2.5" rain) Mild Less ideal

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)