TODAY MAY05
TEMPERATURE
HUMIDITY
PRESSURE
WIND COND.
  • 6748Thu
  • 6748Fri
  • 7351Sat
  • 7350Sun
  • 7649Mon
daynightWeather update from San Francisco, San Francisco International Airport at

Key findings

  • 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 14% better than the national average
  • The pollution index in Hillsborough is 90% worse than the national average

Compare Hillsborough, CA Weather

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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"

      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 index435550
      Pollution index9,645,61018,106,7265,066,862

      Hillsborough air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality263
      Days with moderate air quality98
      Days w/ poor A.Q. for sensitive groups4
      Days with unhealthy air quality0

      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.
      Alameda, CA77,4094020%
      South San Francisco, CA66,5874020%
      San Leandro, CA89,0394020%
      Colma, CA1,5404020%
      San Lorenzo, CA24,7904020%
      Hillsborough, CA11,3124314%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Lyndon, KY11,310492%
      Winton, CA11,309484%
      Crossville, TN11,308536%
      Lowes Island, VA11,316476%
      Lake Arrowhead, CA11,3078978%
      Hillsborough, CA11,3124314%
      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.