TODAY JUN22
TEMPERATURE64
HUMIDITY86
PRESSURE29.95
WIND COND.178
  • 7659Fri
  • 7360Sat
  • 7259Sun
  • 7359Mon
  • 7460Tue
daynightWeather update from DW5683 Carlsbad at

San Marcos Average Weather

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
January33°F87°F55°F2.3"
February39°F85°F56°F2.3"
March42°F84°F57°F0.7"
April46°F98°F59°F0.6"
May51°F88°F62°F0.2"
June55°F92°F65°F0.0"
July59°F98°F69°F0.0"
August61°F88°F70°F0.1"
September54°F90°F67°F0.1"
October51°F96°F65°F0.2"
November41°F93°F62°F0.5"
December39°F90°F55°F0.8"

Did you know?

  • The highest monthly average temperature in San Marcos for August is 70 degrees.
  • The lowest monthly average temperature in San Marcos for January is 55 degrees.
  • The most monthly precipitation in San Marcos occurs in January with 2.3 inches.
  • The air quality index in San Marcos is 22% worse than the national average.
  • The pollution index in San Marcos is 804% worse than the national average.

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Compare San Marcos, CA Weather To Other Cities

San Marcos air quality index & pollution index

In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
IndexSan MarcosCaliforniaNational
Air quality index615550
Pollution index45,820,50018,106,7265,066,862

San Marcos air quality information

MeasurementTotal
Days measured365
Days with good air quality69
Days with moderate air quality277
Days w/ poor A.Q. for sensitive groups17
Days with unhealthy air quality1

San Marcos air quality information

PollutantTotal
Arsenic1.130%
Benzene0.410%
Carbon Tetrachloride0.030%
Lead0.600%
Mercury0.080%

Average monthly San Marcos temperature with heat index

San Marcos monthly precipitation with daily maximum

San Marcos monthly snow depth with daily maximum

San Marcos monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Camp Pendleton South, CA12,4916122%
Escondido, CA149,9126122%
Oceanside, CA173,8296122%
Valley Center, CA9,7836122%
Carlsbad, CA112,0086122%
San Marcos, CA91,4796122%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Westminster, CA91,6357448%
Redding, CA91,3203824%
Boca Raton, FL91,7024118%
Sunrise, FL91,1774118%
Miami Beach, FL91,7844118%
San Marcos, CA91,4796122%
Source: The San Marcos, CA weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.