TODAY AUG17
TEMPERATURE57
HUMIDITY88
PRESSURE30.08
WIND COND.350 3.4
  • 6153Fri
  • 6254Sat
  • 6054Sun
  • 6054Mon
  • 6054Tue
daynightWeather update from Half Moon Bay Airport at

Half Moon Bay Average Weather

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"

Did you know?

  • 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 3% better than the national average.
  • The pollution index in Half Moon Bay is 90% worse than the national average.

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Compare Half Moon Bay, CA Weather To Other Cities

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 index485550
Pollution index9,645,61018,106,7265,066,862

Half Moon Bay air quality information

MeasurementTotal
Days measured365
Days with good air quality204
Days with moderate air quality153
Days w/ poor A.Q. for sensitive groups7
Days with unhealthy air quality1

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, CA1503628%
Brisbane, CA4,5684314%
Colma, CA1,5404314%
South San Francisco, CA66,5874314%
Emerald Lake Hills, CA4,716484%
Half Moon Bay, CA12,281484%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Winfield, KS12,2834412%
Finneytown, OH12,279548%
Rogers, MN12,2844412%
Okmulgee, OK12,2842158%
Portales, NM12,2752354%
Half Moon Bay, CA12,281484%
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.