San Marcos, California 

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Climate in San Marcos, California

San Marcos, California gets 14 inches of rain, on average, per year. The US average is 38 inches of rain per year.

San Marcos averages 0 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 265 sunny days per year in San Marcos. The US average is 205 sunny days.

San Marcos gets some kind of precipitation, on average, 41 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.

Weather Highlights

Summer High: the July high is around 81 degrees
Winter Low: the January low is 45
Rain: averages 14 inches of rain a year
Snow: averages 0 inches of snow a year


The annual BestPlaces Comfort Index for San Marcos is 9.1 (10=best), which means it is one of the most pleasant places in California.

9.7 / 8.5

Summer   /   Winter
June, September and July are the most pleasant months in San Marcos, while January and February are the least comfortable months.

Climate Averages
  San Marcos, CaliforniaUnited States
  13.7 in.38.1 in.
  0.0 in.27.8 in.
  41.3 days106.2 days
  265 days205 days
  581 ft.2443 ft.


Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

August is the hottest month for San Marcos with an average high temperature of 82.4°, which ranks it as cooler than most places in California. In San Marcos, there are 8 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for San Marcos are October, June and July.

In San Marcos, there are 20.4 days annually when the high temperature is over 90°, which is cooler than most places in California.

December has the coldest nighttime temperatures for San Marcos with an average of 44.3°. This is warmer than most places in California.

In San Marcos, there are 1.1 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.

In San Marcos, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in California.

Humidity in San Marcos is generally low and comfortable. But there some days when the humidity becomes unpleasant, especially in August and July. The most humid months (but still comfortable) are August, July and September.

February is the wettest month in San Marcos with 3.1 inches of rain, and the driest month is June with 0.1 inches. The wettest season is Spring with 58% of yearly precipitation and 2% occurs in Autumn, which is the driest season. The annual rainfall of 13.7 inches in San Marcos means that it is drier than most places in California.

February is the rainiest month in San Marcos with 7.2 days of rain, and August is the driest month with only 0.5 rainy days. There are 41.3 rainy days annually in San Marcos, which is less rainy than most places in California. The rainiest season is Spring when it rains 47% of the time and the driest is Autumn with only a 5% chance of a rainy day.

There is rarely any recorded snowfall in San Marcos, ranking it as one of the least snowy places in California. Any measurable snowfall is a rare occurance in San Marcos.

  • Annual Rainfall (US Avg: 36.5")
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    Reviews for San Marcos    5 Reviews
    Best place I have ever lived. - 12/20/2018
    Just an amazing place to live. I have lived in 7 states and almost countless cities. Sam Marcos is one of the best. This is literally the longest place I have lived... Read More

    Start Your Review of San Marcos

    retiree location ? - 4/1/2010
    Is this area to expensive for the average income retired... Read More

    San Marcos Weather - 11/6/2007
    Beautiful Mediterranean climate with bright sunshine and ocean breazes. City is just 15 minutes away from the... Read More

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