TODAY NOV13
TEMPERATURE61
HUMIDITY68
PRESSURE101680
WIND COND.30 3.2
  • 7451Wed
  • 7054Thu30%
  • 6249Fri60%40%
  • 6144Sat
  • 6548Sun
daynightWeather update from EW3219 National City at
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Weather Quick Facts

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

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      Webster 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"

      Webster 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.
      IndexWebsterSan DiegoCalifornia
      Air quality index646455
      Pollution index45,820,50045,820,50010,473,190

      Webster 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 Webster temperature with heat index

      Webster monthly precipitation with daily maximum

      Webster monthly snow depth with daily maximum

      Webster monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Chula Vista, CA268,7796428.0%
      La Presa, CA37,4106428.0%
      Spring Valley, CA31,8666428.0%
      El Cajon, CA103,2496428.0%
      Lakeside, CA21,0326428.0%
      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 Webster, 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.