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Key findings

  • The highest monthly average temperature in Gilroy for July is 61 degrees
  • The lowest monthly average temperature in Gilroy for January is 47 degrees
  • The most monthly precipitation in Gilroy occurs in December with 9.8 inches
  • The air quality index in Gilroy is 26% better than the national average
  • The pollution index in Gilroy is 7% worse than the national average

Compare Gilroy, CA Weather

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      Gilroy 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
      January38°F60°F47°F6.0"
      February44°F62°F52°F7.2"
      March44°F65°F53°F5.4"
      April43°F67°F54°F2.8"
      May48°F69°F57°F1.3"
      June50°F72°F59°F2.4"
      July54°F73°F61°F0.1"
      August53°F74°F61°F0.0"
      September51°F74°F60°F1.9"
      October47°F73°F58°F2.0"
      November45°F69°F55°F2.7"
      December41°F61°F50°F9.8"

      Gilroy 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.
      IndexGilroyCaliforniaNational
      Air quality index375550
      Pollution index5,429,55018,106,7265,066,862

      Gilroy air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality330
      Days with moderate air quality34
      Days w/ poor A.Q. for sensitive groups1
      Days with unhealthy air quality0

      Gilroy air quality information

      PollutantTotal
      Arsenic0.020%
      Benzene0.080%
      Carbon Tetrachloride0.000%
      Lead0.050%
      Mercury0.150%

      Average monthly Gilroy temperature with heat index

      Gilroy monthly precipitation with daily maximum

      Gilroy monthly snow depth with daily maximum

      Gilroy monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Day Valley, CA3,7393530%
      Corralitos, CA2,5573530%
      Freedom, CA2,7743530%
      La Selva Beach, CA2,6333530%
      Amesti, CA3,2053530%
      Gilroy, CA52,5763726%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Burlington, NC52,5703138%
      Delano, CA52,5386734%
      Levittown, PA52,4074118%
      West New York, NJ52,407512%
      Elkhart, IN52,3783726%
      Gilroy, CA52,5763726%
      Source: The Gilroy, 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.