TODAY JUN18
TEMPERATURE60
HUMIDITY83
PRESSURE100820
WIND COND.
  • 7359
  • 7459Thu
  • 7661Fri
  • 7963Sat
  • 8063Sun
daynightWeather update from DW5683 Carlsbad at
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Weather Quick Facts

  • The highest monthly average temperature in Lake San Marcos for August is 70.2 degrees
  • The lowest monthly average temperature in Lake San Marcos for December is 55.8 degrees
  • The most monthly precipitation in Lake San Marcos occurs in December with 2.7 inches
  • The air quality index in Lake San Marcos is 52% worse than the national average
  • The pollution index in Lake San Marcos is 1581% worse than the national average

Compare Lake San Marcos, CA Weather

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      Lake San Marcos Average Temperature

      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
      January48°F67°F56°F1.8"
      February49°F66°F56°F2.0"
      March51°F67°F58°F1.1"
      April54°F68°F60°F0.7"
      May58°F69°F63°F0.4"
      June61°F71°F65°F0.0"
      July65°F75°F69°F0.1"
      August66°F76°F70°F0.1"
      September64°F77°F70°F0.1"
      October59°F75°F67°F0.5"
      November53°F71°F61°F1.0"
      December48°F66°F56°F2.7"

      Lake 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.
      IndexLake San MarcosCaliforniaNational
      Air quality index645542
      Pollution index45,820,50010,473,1902,726,193

      Lake San Marcos air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality87
      Days with moderate air quality253
      Days w/ poor A.Q. for sensitive groups23
      Days with unhealthy air quality2

      Lake San Marcos air quality information

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

      Average monthly Lake San Marcos temperature with heat index

      Lake San Marcos monthly precipitation with daily maximum

      Lake San Marcos monthly snow depth with daily maximum

      Lake San Marcos monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Poway, CA49,7806428.0%
      Hidden Meadows, CA3,6756428.0%
      Encinitas, CA62,9676428.0%
      Rancho Santa Fe, CA2,6576428.0%
      Bonsall, CA4,1946428.0%
      Lake San Marcos, CA3,9576428.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Southgate, KY3,957548.0%
      Level Green, PA3,9575612.0%
      Grand Mound, WA3,9572060.0%
      Ashland, MO3,9563824.0%
      Weaverville, NC3,9564412.0%
      Lake San Marcos, CA3,9576428.0%
      Source: The Lake 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.