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San Marcos, CA Weather


San Marcos, CA climate is warm during summer when temperatures tend to be in the 70's and cool during winter when temperatures tend to be in the 50's.

The warmest month of the year is August with an average maximum temperature of 89.10 degrees Fahrenheit, while the coldest month of the year is December with an average minimum temperature of 41.60 degrees Fahrenheit.

Temperature variations between night and day tend to be moderate during summer with a difference that can reach 27 degrees Fahrenheit, and moderate during winter with an average difference of 25 degrees Fahrenheit.

The annual average precipitation at San Marcos is 15.10 Inches. Rainfall in is fairly evenly distributed throughout the year. The wettest month of the year is January with an average rainfall of 3.37 Inches.

Weather Data

Normal Climate

Normal Temperatures

(ESCONDIDO NO 2 Weather station, 4.11 miles from San Marcos)
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Max °F 68.5 69.4 70.4 74.8 77.5 83.6 88.6 89.1 86.9 81.0 73.9 69.2 77.7
Mean °F 55.5 57.0 58.6 62.3 66.0 70.8 75.1 76.2 74.0 68.0 60.1 55.4 64.9
Min °F 42.5 44.5 46.8 49.8 54.4 57.9 61.5 63.2 61.1 54.9 46.3 41.6 52.0

Normal Precipitation

(ESCONDIDO NO 2 Weather station, 4.11 miles from San Marcos)
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Inch 3.37 3.16 3.30 1.04 0.27 0.11 0.07 0.02 0.22 0.44 1.32 1.78 15.10