TODAY MAY09
TEMPERATURE55
HUMIDITY77
PRESSURE30.01
WIND COND.320 22.3
  • 6649Mon
  • 6649Tue
  • 6149Wed
  • 5849Thu
  • 5749Fri
daynightWeather update from Half Moon Bay Airport at

Key findings

  • The highest monthly average temperature in Pacifica for September is 63.3 degrees
  • The lowest monthly average temperature in Pacifica for January is 50.7 degrees
  • The most monthly precipitation in Pacifica occurs in December with 4.4 inches
  • The air quality index in Pacifica is 14% better than the national average
  • The pollution index in Pacifica is 90% worse than the national average

Compare Pacifica, CA Weather

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      Pacifica 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
      January44°F58°F51°F3.2"
      February46°F62°F53°F3.4"
      March47°F64°F54°F2.7"
      April49°F67°F56°F1.7"
      May51°F69°F58°F0.3"
      June54°F72°F61°F0.2"
      July56°F73°F62°F0.0"
      August56°F73°F62°F0.0"
      September56°F76°F63°F0.1"
      October54°F73°F62°F1.0"
      November49°F65°F56°F1.7"
      December44°F58°F51°F4.4"

      Pacifica 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.
      IndexPacificaCaliforniaNational
      Air quality index435550
      Pollution index9,645,61018,106,7265,066,862

      Pacifica air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality252
      Days with moderate air quality101
      Days w/ poor A.Q. for sensitive groups10
      Days with unhealthy air quality2

      Pacifica air quality information

      PollutantTotal
      Arsenic0.140%
      Benzene0.070%
      Carbon Tetrachloride0.000%
      Lead0.100%
      Mercury0.020%

      Average monthly Pacifica temperature with heat index

      Pacifica monthly precipitation with daily maximum

      Pacifica monthly snow depth with daily maximum

      Pacifica monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Brisbane, CA4,5684020%
      Daly City, CA105,5434020%
      South San Francisco, CA66,5874020%
      Alameda, CA77,4094020%
      Oakland, CA412,0404020%
      Pacifica, CA38,8444314%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Mableton, GA38,839524%
      Tupelo, MS38,8563922%
      Marumsco, VA38,815476%
      Huber Heights, OH38,795476%
      Hallandale Beach, FL38,9514118%
      Pacifica, CA38,8444314%
      Source: The Pacifica, 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.