TODAY SEP24
TEMPERATURE63
HUMIDITY87
PRESSURE30.06
WIND COND.290 14.8
  • 7660Fri
  • 8361Sat
  • 9065Sun
  • 9364Mon
  • 8962Tue
daynightWeather update from San Francisco, San Francisco International Airport at

Key findings

  • The highest monthly average temperature in Hillsdale for September is 63 degrees
  • The lowest monthly average temperature in Hillsdale for January is 51 degrees
  • The most monthly precipitation in Hillsdale occurs in December with 4.4 inches
  • The air quality index in Hillsdale is 14% better than the national average
  • The pollution index in Hillsdale is 90% worse than the national average

Compare San Mateo, CA Weather

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      Hillsdale 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"

      Hillsdale 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.
      IndexHillsdaleSan MateoCalifornia
      Air quality index434355
      Pollution index9,645,6109,645,61018,106,726

      Hillsdale 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

      Hillsdale air quality information

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

      Average monthly Hillsdale temperature with heat index

      Hillsdale monthly precipitation with daily maximum

      Hillsdale monthly snow depth with daily maximum

      Hillsdale monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Castro Valley, CA62,8254020%
      San Lorenzo, CA24,7904020%
      Brisbane, CA4,5684020%
      South San Francisco, CA66,5874020%
      Alameda, CA77,4094020%
      San Mateo, CA102,2244314%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Sandy Springs, GA102,212524%
      Clovis, CA102,1486020%
      Davenport, IA102,305468%
      Lewisville, TX102,327512%
      Rialto, CA102,4188978%
      San Mateo, CA102,2244314%
      Source: The Hillsdale, San Mateo, 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.