Hillsborough, CA Weather - Forecast & Monthly Averages

TEMPERATURE	55
HUMIDITY	100
PRESSURE	102100
WIND COND.

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Weather Quick Facts

The highest monthly average temperature in Hillsborough for September is 63.3 degrees
The lowest monthly average temperature in Hillsborough for January is 50.7 degrees
The most monthly precipitation in Hillsborough occurs in December with 4.4 inches
The air quality index in Hillsborough is 2% worse than the national average
The pollution index in Hillsborough is 254% worse than the national average

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Hillsborough 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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Hillsborough 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	Hillsborough	California	National
Air quality index	43	55	42
Pollution index	9,645,610	10,473,190	2,726,193

Hillsborough air quality

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

Air quality details

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

Average monthly Hillsborough temperature with heat index

Hillsborough monthly precipitation with daily maximum

Hillsborough monthly snow depth with daily maximum

Hillsborough monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
San Lorenzo, CA	30,117	40	20.0%
Brisbane, CA	4,645	40	20.0%
Daly City, CA	107,197	40	20.0%
Ashland, CA	23,566	40	20.0%
South San Francisco, CA	66,878	40	20.0%
Hillsborough, CA	11,608	43	14.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Seven Hills, OH	11,597	50	= 100
Winton, CA	11,619	48	4.0%
Jefferson, GA	11,619	44	12.0%
View Park-Windsor Hills, CA	11,621	72	44.0%
Cedarburg, WI	11,592	44	12.0%
Hillsborough, CA	11,608	43	14.0%

Source: The Hillsborough, 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.