Half Moon Bay, CA Weather - Forecast & Monthly Averages

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Weather Quick Facts

The highest monthly average temperature in Half Moon Bay for September is 63.3 degrees
The lowest monthly average temperature in Half Moon Bay for January is 50.7 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 2% worse than the national average
The pollution index in Half Moon Bay is 254% worse than the national average

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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.
Month	Temp. _(min)	Temp. _(max)	Temp. _(avg)	Precipitation
January	44°F	58°F	51°F	3.2"
February	46°F	62°F	53°F	3.4"
March	47°F	64°F	54°F	2.7"
April	49°F	67°F	56°F	1.7"
May	51°F	69°F	58°F	0.3"
June	54°F	72°F	61°F	0.2"
July	56°F	73°F	62°F	0.0"
August	56°F	73°F	62°F	0.0"
September	56°F	76°F	63°F	0.1"
October	54°F	73°F	62°F	1.0"
November	49°F	65°F	56°F	1.7"
December	44°F	58°F	51°F	4.4"

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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.
Index	Half Moon Bay	California	National
Air quality index	43	55	42
Pollution index	9,645,610	10,473,190	2,726,193

Half Moon Bay air quality information

Measurement	Total
Days measured	365
Days with good air quality	263
Days with moderate air quality	98
Days w/ poor A.Q. for sensitive groups	4
Days with unhealthy air quality	0

Half Moon Bay air quality information

Pollutant	Total
Arsenic	0.140%
Benzene	0.070%
Carbon Tetrachloride	0.000%
Lead	0.100%
Mercury	0.020%

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	Population	Air Quality Index	National Avg.
Loma Mar, CA	282	35	30.0%
Brisbane, CA	4,645	40	20.0%
South San Francisco, CA	66,878	40	20.0%
Colma, CA	1,492	40	20.0%
Emerald Lake Hills, CA	4,893	43	14.0%
Half Moon Bay, CA	12,583	43	14.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Wilton Manors, FL	12,582	41	18.0%
East Renton Highlands, WA	12,576	45	10.0%
Maili, HI	12,591	30	40.0%
Richmond, TX	12,592	52	4.0%
Truro, NS	12,598	n/a
Half Moon Bay, CA	12,583	43	14.0%

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.