Half Moon Bay, CA Weather Forecast & Monthly Average Temperatures

TEMPERATURE	57
HUMIDITY	88
PRESSURE	30.08
WIND COND.	350 3.4

Half Moon Bay Average Weather

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"

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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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	48	55	50
Pollution index	9,645,610	18,106,726	5,066,862

Half Moon Bay air quality information

Measurement	Total
Days measured	365
Days with good air quality	204
Days with moderate air quality	153
Days w/ poor A.Q. for sensitive groups	7
Days with unhealthy air quality	1

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, State	Population	Air Quality Index	National Avg.
Loma Mar, CA	150	36	28%
Brisbane, CA	4,568	43	14%
Colma, CA	1,540	43	14%
South San Francisco, CA	66,587	43	14%
Emerald Lake Hills, CA	4,716	48	4%
Half Moon Bay, CA	12,281	48	4%

Cities with similar population

City, State	Population	Air Quality Index	National Avg.
Winfield, KS	12,283	44	12%
Finneytown, OH	12,279	54	8%
Rogers, MN	12,284	44	12%
Okmulgee, OK	12,284	21	58%
Portales, NM	12,275	23	54%
Half Moon Bay, CA	12,281	48	4%

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.