TODAY FEB28
TEMPERATURE67
HUMIDITY20
PRESSURE30.15
WIND COND.50 7.6
  • 6642Mon
  • 6643Tue
  • 6443Wed
  • 6545Thu
  • 6446Fri
daynightWeather update from Hayward, Hayward Air Terminal at

Key findings

  • The highest monthly average temperature in Castro Valley for August is 64 degrees
  • The lowest monthly average temperature in Castro Valley for December is 49 degrees
  • The most monthly precipitation in Castro Valley occurs in January with 3.5 inches
  • The air quality index in Castro Valley is 20% better than the national average
  • The pollution index in Castro Valley is 27% worse than the national average

Compare Castro Valley, CA Weather

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      Castro Valley 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
      January42°F58°F50°F3.5"
      February46°F61°F53°F3.3"
      March46°F64°F54°F2.6"
      April48°F66°F56°F1.8"
      May52°F69°F59°F0.6"
      June56°F73°F62°F0.1"
      July57°F75°F64°F0.0"
      August58°F76°F64°F0.0"
      September57°F76°F64°F0.2"
      October53°F72°F61°F1.4"
      November48°F66°F56°F1.3"
      December42°F58°F49°F3.2"

      Castro Valley 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.
      IndexCastro ValleyCaliforniaNational
      Air quality index405550
      Pollution index6,427,29018,106,7265,066,862

      Castro Valley air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality290
      Days with moderate air quality74
      Days w/ poor A.Q. for sensitive groups1
      Days with unhealthy air quality0

      Castro Valley air quality information

      PollutantTotal
      Arsenic0.010%
      Benzene0.110%
      Carbon Tetrachloride0.010%
      Lead0.010%
      Mercury0.003%

      Average monthly Castro Valley temperature with heat index

      Castro Valley monthly precipitation with daily maximum

      Castro Valley monthly snow depth with daily maximum

      Castro Valley monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      San Lorenzo, CA24,7904020%
      Alameda, CA77,4094020%
      Oakland, CA412,0404020%
      Albany, CA19,4204020%
      Kensington, CA5,6024020%
      Castro Valley, CA62,8254020%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Bowling Green, KY62,8244314%
      Greenville, SC62,776468%
      Cheyenne, WY62,8794314%
      South Jordan, UT62,751512%
      Waltham, MA62,6994314%
      Castro Valley, CA62,8254020%
      Source: The Castro Valley, 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.