San Marcos (CA) Weather and Climate: A Comprehensive Guide
Temperatures see a moderate degree of fluctuation,
transitioning from warm conditions
to pleasant.
San Marcos has a dry climate with relatively low precipitation levels.
Let's now guide you through the climate details for a complete overview.
Average maximum day and minimum night temperature
In San Marcos, seasonal changes bring about a moderate variation in temperatures. Average maximum daytime temperatures range from a comfortable 30°C in August, the warmest time of the year, to a pleasant 19°C during cooler months like January.
At night, temperatures typically drop to an average of around 7°C during these months. Check out our detailed temperature page for more information.Temperature ranges by month
Precipitation and rainy days
San Marcos typically sees modest rainfall throughout the year, with an average annual precipitation of 309 mm. Significant seasonal changes in precipitation occur throughout the year. During the wetter season, December receives moderate rainfall, averaging 79 mm of precipitation, recorded across 8 rainy days. In contrast, the drier season, June brings less rainfall, with 0.6 mm over a single rainy day. For more details, please visit our San Marcos Precipitation page.The mean monthly precipitation over the year, including rain, hail and snow
The average number of days each month with precipitation
Sunshine over the year
While the amount of sunshine in San Marcos varies throughout the year, all seasons offer their own charm. Enjoy up to 10.1 hours of daily sun in July, and experience slightly darker atmosphere in February, with about 7.7 hours of daily sunlight. Visit our detailed sunshine hours page for more information.Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Average humidity
The relative humidity is high throughout the year in San Marcos.
The city experiences its highest humidity in July, reaching 75%. In January, the humidity drops to its lowest level at 64%. Explore our detailed page on humidity levels for further details.
Relative humidity over the year
broken clouds and no rain broken clouds and no rain almost clear and no rainForecast for San Marcos (CA)
3 m/s
3 m/s
3 m/s
The best time of year to visit San Marcos in the United States of America
During the months of January, February, March, April, May and November you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.Other facts from our historical weather data:
Yes, the months of May, June, July, August, September and October are very dry.
August has an average maximum temperature of 30°C and is the warmest month of the year.
The coldest month is December with an average maximum temperature of 19°C.
December tops the wettest month list with 79 mm of rainfall.
June is the driest month with 1 mm of precipitation.
July is the sunniest month with an average of 304 hours of sunshine.
No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
