TODAY DEC14
TEMPERATURE58
HUMIDITY81
PRESSURE30.07
WIND COND.160 15
  • 6052Sat20%20%
  • 6050Sun70%90%
  • 5845Mon30%
  • 5946Tue
  • 6046Wed
daynightWeather update from San Francisco, San Francisco International Airport at

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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.
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 Hillsborough for September is 63 degrees.
  • The lowest monthly average temperature in Hillsborough for January is 51 degrees.
  • The most monthly precipitation in Hillsborough occurs in December with 4.4 inches.
  • The air quality index in Hillsborough is 3% better than the national average.
  • The pollution index in Hillsborough is 90% worse than the national average.

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Compare Hillsborough, CA Weather To Other Cities

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.
IndexHillsboroughCaliforniaNational
Air quality index485550
Pollution index9,645,61018,106,7265,066,862

Hillsborough 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

Hillsborough air quality information

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

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, StatePopulationAir Quality IndexNational Avg.
San Lorenzo, CA24,7904314%
Alameda, CA77,4094314%
Brisbane, CA4,5684314%
Colma, CA1,5404314%
Ashland, CA24,2884314%
Hillsborough, CA11,312484%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Lyndon, KY11,3105510%
Winton, CA11,309548%
Lowes Island, VA11,316492%
Crossville, TN11,308536%
Lake Arrowhead, CA11,3078570%
Hillsborough, CA11,312484%
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.