Castro Valley, CA Weather Forecast & Monthly Average Temperatures

TEMPERATURE	69
HUMIDITY	59
PRESSURE	29.89
WIND COND.	300 15

Castro Valley Average Weather

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
Month	Temp. _(min)	Temp. _(max)	Temp. _(avg)	Precipitation
January	42°F	58°F	50°F	3.5"
February	46°F	61°F	53°F	3.3"
March	46°F	64°F	54°F	2.6"
April	48°F	66°F	56°F	1.8"
May	52°F	69°F	59°F	0.6"
June	56°F	73°F	62°F	0.1"
July	57°F	75°F	64°F	0.0"
August	58°F	76°F	64°F	0.0"
September	57°F	76°F	64°F	0.2"
October	53°F	72°F	61°F	1.4"
November	48°F	66°F	56°F	1.3"
December	42°F	58°F	49°F	3.2"

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.
Index	Castro Valley	California	National
Air quality index	43	55	50
Pollution index	6,427,290	18,106,726	5,066,862

Castro Valley air quality information

Measurement	Total
Days measured	365
Days with good air quality	241
Days with moderate air quality	115
Days w/ poor A.Q. for sensitive groups	9
Days with unhealthy air quality

Castro Valley air quality information

Pollutant	Total
Arsenic	0.010%
Benzene	0.110%
Carbon Tetrachloride	0.010%
Lead	0.010%
Mercury	0.003%

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, State	Population	Air Quality Index	National Avg.
Acalanes Ridge, CA	1,000	43	14%
Ashland, CA	24,288	43	14%
Camino Tassajara, CA	3,456	43	14%
Danville, CA	43,758	43	14%
El Cerrito CDP, CA	5,699	43	14%
Castro Valley, CA	62,825	43	14%

Cities with similar population

City, State	Population	Air Quality Index	National Avg.
Bowling Green, KY	62,824	38	24%
Greenville, SC	62,776	40	20%
Cheyenne, WY	62,879	40	20%
South Jordan, UT	62,751	47	6%
Waltham, MA	62,699	47	6%
Castro Valley, CA	62,825	43	14%

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.