TODAY JAN21
TEMPERATURE61
HUMIDITY29
PRESSURE30.06
WIND COND.330 16.6
  • 6044Thu20%
  • 5841Fri30%20%
  • 5841Sat
  • 5642Sun
  • 5439Mon
daynightWeather update from Half Moon Bay Airport at

Key findings

  • The highest monthly average temperature in Half Moon Bay for September is 63 degrees
  • The lowest monthly average temperature in Half Moon Bay for January is 51 degrees
  • The most monthly precipitation in Half Moon Bay occurs in December with 4.4 inches
  • The air quality index in Half Moon Bay is 14% better than the national average
  • The pollution index in Half Moon Bay is 90% worse than the national average

Compare Half Moon Bay, CA Weather

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      Half Moon Bay 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"

      Half Moon Bay 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.
      IndexHalf Moon BayCaliforniaNational
      Air quality index435550
      Pollution index9,645,61018,106,7265,066,862

      Half Moon Bay air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality263
      Days with moderate air quality98
      Days w/ poor A.Q. for sensitive groups4
      Days with unhealthy air quality0

      Half Moon Bay air quality information

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

      Average monthly Half Moon Bay temperature with heat index

      Half Moon Bay monthly precipitation with daily maximum

      Half Moon Bay monthly snow depth with daily maximum

      Half Moon Bay monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Loma Mar, CA1503530%
      Brisbane, CA4,5684020%
      South San Francisco, CA66,5874020%
      Colma, CA1,5404020%
      Emerald Lake Hills, CA4,7164314%
      Half Moon Bay, CA12,2814314%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Finneytown, OH12,279548%
      Winfield, KS12,2834020%
      Rogers, MN12,284468%
      Okmulgee, OK12,284590%
      Portales, NM12,2751570%
      Half Moon Bay, CA12,2814314%
      Source: The Half Moon Bay, 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.