TODAY AUG20
TEMPERATURE69
HUMIDITY59
PRESSURE29.89
WIND COND.300 15
  • 7555Mon
  • 7454Tue
  • 7654Wed
  • 7653Thu
  • 7553Fri
daynightWeather update from Hayward, Hayward Air Terminal at

Castro Valley Average Weather

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"

Did you know?

  • 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 13% better than the national average.
  • The pollution index in Castro Valley is 26% worse than the national average.

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Compare Castro Valley, CA Weather To Other Cities

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 index435550
Pollution index6,427,29018,106,7265,066,862

Castro Valley air quality information

MeasurementTotal
Days measured365
Days with good air quality241
Days with moderate air quality115
Days w/ poor A.Q. for sensitive groups9
Days with unhealthy air quality

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.
Acalanes Ridge, CA1,0004314%
Ashland, CA24,2884314%
Camino Tassajara, CA3,4564314%
Danville, CA43,7584314%
El Cerrito CDP, CA5,6994314%
Castro Valley, CA62,8254314%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Bowling Green, KY62,8243824%
Greenville, SC62,7764020%
Cheyenne, WY62,8794020%
South Jordan, UT62,751476%
Waltham, MA62,699476%
Castro Valley, CA62,8254314%
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.