TODAY OCT15
TEMPERATURE68
HUMIDITY81
PRESSURE101640
WIND COND.210 6.4
  • 6360Tue
  • 6261Wed
  • 6461Thu20%
  • 6458Fri
  • 6557Sat
daynightWeather update from EW9951 San Diego Shelter Island at
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Weather Quick Facts

  • The highest monthly average temperature in Loma Portal for August is 71.1 degrees
  • The lowest monthly average temperature in Loma Portal for December is 57.5 degrees
  • The most monthly precipitation in Loma Portal occurs in December with 2.2 inches
  • The air quality index in Loma Portal is 52% worse than the national average
  • The pollution index in Loma Portal is 1581% worse than the national average

Compare San Diego, CA Weather

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      Loma Portal 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
      January49°F68°F58°F1.7"
      February51°F68°F59°F1.8"
      March54°F69°F60°F1.0"
      April56°F70°F62°F0.6"
      May60°F70°F64°F0.4"
      June62°F72°F66°F0.0"
      July66°F76°F70°F0.2"
      August67°F78°F71°F0.0"
      September66°F78°F71°F0.2"
      October61°F77°F68°F0.5"
      November55°F73°F63°F0.9"
      December49°F67°F58°F2.2"

      Loma Portal 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.
      IndexLoma PortalSan DiegoCalifornia
      Air quality index646455
      Pollution index45,820,50045,820,50010,473,190

      Loma Portal air quality

      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

      Air quality details

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

      Average monthly Loma Portal temperature with heat index

      Loma Portal monthly precipitation with daily maximum

      Loma Portal monthly snow depth with daily maximum

      Loma Portal monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Chula Vista, CA268,7796428.0%
      Lemon Grove, CA26,7396428.0%
      La Mesa, CA60,2086428.0%
      Coronado, CA24,5266428.0%
      National City, CA61,3426428.0%
      San Diego, CA1,414,5456428.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Calgary, AB1,371,990n/a 
      Dallas, TX1,338,846512.0%
      San Antonio, TX1,529,133492.0%
      Philadelphia, PA1,581,531512.0%
      Phoenix, AZ1,658,4227448.0%
      San Diego, CA1,414,5456428.0%
      Source: The Loma Portal, San Diego, 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.